Xantorohara

Java 7

2011-10-07T13:28:00.005+04:00

Great enhancement: binary literals and underscores:


int netaddr = 0b11000000_10101000_00000000_00000000; //192.168.0.0
int netmask = 0xFF_FF_FF_00; //255.255.255.0

My big vacations

2011-10-07T12:54:00.004+04:00

Now I have a big vacation between my past and future jobs.
I traveled to Turkey and had a big fun: climbing to the mountains, trip to antic cities, free-diving and driving buggy.

MySQL Workbench crashes on startup under Windows 7 64-bit

2011-10-03T13:41:00.002+04:00

MySQL Workbench crashes on startup.

This problem appears because of normal users install 64-bit libraries (.Net Framework and Visual C++ Redistributable) for 64-bit Windows 7.

But MySQL Workbench compiled with 32-bit binaries and required 32-bit libraries. So you have to install Microsoft Visual C++ Redistributable x86 (!not x64).

Spring: annotation driven and configured scheduler

2011-07-08T14:21:00.003+04:00

Properties file (file.properties):


...
manager.cron=0 */1 * * * ?
...

Application context (context.xml)


...
<context:property-placeholder location="file.properties"/>
<task:annotation-driven/>
...

Bean:


@Component
public class Manager {
...
    @Scheduled(cron = "${manager.cron}")
    public void doSomething() {
        log.info("doSomething");
    }
...
}

AMF3 expected int but got double

2010-11-17T15:46:00.003+03:00

Surprise :-)

Max AMF3 value for integer = 268435456.

In AMF3 integers are serialized using a variable length unsigned 29-bit integer. The ActionScript integer types - a signed 'int' type and an unsigned 'uint' type - are also represented using 29-bits. If the value of an unsigned integer (uint) is greater or equal to 22^9 or if the value of a signed integer (int) is greater than or equal to 22^8 then it will be represented as a double and thus serialized in using the AMF3 double type.

Flex: load external CSS

2010-11-10T12:00:00.002+03:00

Create and compile css file (mxmlc -static-rsls=true -output=out/style.swf src/style.css)

Load this style file from the application (styleManager.loadStyleDeclarations('style.swf');)

Flex compiler locale

2010-03-28T01:27:00.004+03:00

In order to switch flex compiler messages to US locale put this string "-Duser.language=en -Duser.region=US" into the $FLEX_HOME/bin/jvm.config file.


...
java.args=-Xmx384m -Dsun.io.useCanonCaches=false -Duser.language=en -Duser.region=US
...

Enable disabled menu in browser

2010-01-25T20:24:00.001+03:00

Execute this from the address line:
javascript: (function(){document.oncontextmenu=function(){return true;}})()
or

javascript: (function(){function test(){return true;}; document.oncontextmenu=test;document.onselectstart=test;document.oncontextmenu=test;})()

Download FreeBSD packages with dependencies

2009-08-17T18:13:00.002+04:00

Just code, no comments:

<?php

#Where to save downloaded packages
$dir = '/tmp/packages';

#FTP server with all packages
$ftp = 'ftp://ftp6.ru.freebsd.org/pub/FreeBSD/ports/i386/packages-7.2-release/All';
 
#Target packages we need to retrieve 
$packages = array(
    'bash-3.2.48_1',
    'bzip2-1.0.5',
    'curl-7.19.4',
    'mc-4.6.2',
    'mysql-server-5.0.77_1',
    'php5-mysqli-5.2.9',
    'postgresql-server-8.3.7',
    'vim-7.2.132',
    'wget-1.11.4',
    'zip-3.0'
);

#Load packages info from previously downloaded INDEX file (ftp://ftp6.ru.freebsd.org/pub/FreeBSD/ports/i386/packages-7.2-release/All/INDEX) 
function get_tree() {
    $handle = fopen('INDEX', 'r');
    $tree = array();
    while (($data = fgetcsv($handle, 0, '|')) !== FALSE) {
        $tree[$data[0]] = $data[8];
    }
    fclose($handle);
    return $tree;
}

$tree = get_tree();

#Calculate dependencies
for ($i = 0; $i < sizeof($packages); $i++) {
    if (isset($tree, $packages[$i])) {
        $deps = explode(' ', $tree[$packages[$i]]);
        foreach ($deps as $dep) {
            if (strlen($dep)>0 && !in_array($dep, $packages)) {
                $packages[] = $dep;
            }
        }
    }
}

#Downloading
foreach ($packages as $package) {
    file_put_contents($dir.'/'.$package.'.tbz', file_get_contents($ftp.'/'.$package.'.tbz'));
    echo "$package.tbz\n";
}

?>

Make local FreeBSD mirror via rsync

2009-08-14T13:42:00.000+04:00

rsync -va --delete --progress ftp.nl.FreeBSD.org::FreeBSD/ports/i386/packages-7.2-release/ FreeBSD-7.2-i386

Bind XML to Java classes

2009-08-13T13:19:00.003+04:00

Just follow this example:

cbr_daily.xml

<ValCurs Date="30/05/2009" name="Foreign Currency Market">
    <Valute ID="R01035">
        <NumCode>826</NumCode>
        <CharCode>GBP</CharCode>
        <Nominal>1</Nominal>
        <Name>Фунт стерлингов Соединенного королевства</Name>
        <Value>49,7887</Value>
    </Valute>
    <Valute ID="R01235">
        <NumCode>840</NumCode>
        <CharCode>USD</CharCode>
        <Nominal>1</Nominal>
        <Name>Доллар США</Name>
        <Value>30,9843</Value>
    </Valute>
    <Valute ID="R01239">
        <NumCode>978</NumCode>
        <CharCode>EUR</CharCode>
        <Nominal>1</Nominal>
        <Name>Евро</Name>
        <Value>43,3780</Value>
    </Valute>
</ValCurs>

ValCursType.java

package xqx;

import java.util.List;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;

@XmlRootElement(name = "ValCurs")
@XmlType(name = "ValCursType")
public class ValCursType {

    @XmlElement(name = "Valute")
    public List<ValuteType> valuteType;

    @XmlAttribute(name = "Date")
    public String date;

    @XmlAttribute
    public String name;
}

ValuteType.java

package xqx;

import javax.xml.bind.annotation.*;

@XmlRootElement(name = "Valute")
@XmlType(name = "ValuteType")
public class ValuteType {
    @XmlElement(name = "NumCode")
    public String numCode;

    @XmlElement(name = "CharCode")
    public String charCode;

    @XmlElement(name = "Nominal")
    public int nominal;

    @XmlElement(name = "Name")
    public String name;

    @XmlElement(name = "Value")
    public String value;

    @XmlAttribute(name = "ID")
    public String id;
}

CbrCurrencyTask.java

package xqx;

import ...;

public class CbrCurrencyTask {

    ...
    //stream - For example FileInputStream created from the "cbr_daily.xml" file
    protected ValCursType parse(InputStream stream) throws JAXBException {
        JAXBContext jaxbContext = JAXBContext.newInstance(ValCursType.class);
        Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();

        ValCursType valCursType = (ValCursType) unmarshaller.unmarshal(stream);
        return valCursType;
    }
    ...
    
}

Simple! Isn't it?

Mount CD in FreeBSD

2009-08-13T13:01:00.000+04:00

See all disks:
atacontrol list

Mount:
mount -t cd9660 /dev/acd0 /cdrom

JDBC: Postgres enums and prepared statements

2009-07-27T17:21:00.003+04:00

There is simple way how to map Java enums to PostgreSQL enums via JDBC's prepared statements.

For example we have these PostgreSQL enum and table definitions:

CREATE TYPE log_level AS ENUM ('INFO', 'WARN', 'ERROR');

CREATE TABLE logs (
  id SERIAL PRIMARY KEY,
  message VARCHAR(255) NOT NULL,
  level log_level NOT NULL,
);

And Java enum:


public enum LogLevel {
    INFO, WARN, ERROR
}

This form of prepared statement should work:


LogLevel logLevel = LogLevel.INFO;
PreparedStatement sql = conn.prepareStatement("INSERT INTO logs (message, log_level) VALUES (?, ?::log_level)");
sql.setString(1, "Hello world");
//sql.setString(2, "INFO");
sql.setString(2, logLevel.name());

Get browser language via JavaScript

2009-02-28T22:58:00.008+03:00

This is simple cross-browser solution:

var lang = (navigator.language || navigator.systemLanguage || navigator.userLanguage || 'en').substr(0, 2).toLowerCase();

And usage example:

var lang = (navigator.language || navigator.systemLanguage || navigator.userLanguage || 'en').substr(0, 2).toLowerCase(); if (lang == 'ru') { document.write('Specific Russian text'); } else { document.write('Common English text'); }

PHP-reference

2009-02-24T00:11:00.007+03:00

I'm happy to introduce one more my project: PHP-reference.

This is the interactive engine for PHP documentation: the client side is implemented with ExtJS/JavaScript, and PHP for server side.
It uses original PHP documentation (processed via regexps and colored with CSS styles) as a data source.

I've tried to create it as usable as possible... any requests, ideas welcome!

TOAD connection problem under Windows XP x64

2009-02-18T18:58:00.005+03:00

I've catch this problem with my installation of TOAD (and with PLSQL Developer) under Windows XP 64-bit edition:
"ORA-12154: TNS:could not resolve the connect identifier specified" (but under Windows XP 32-bit all OK).

And here is the simplest solution:
run TOAD via command line using short path: C:\PROGRA~2\QUESTS~1\TOAD\TOAD.exe
instead of long: C:\Program Files (x86)\Quest Software\TOAD\TOAD.exe

Unfortunately Windows doesn't allow to change desktop's shortcut from long mode to short (Windows always expands short paths).

Or... move TOAD from "Program Files (x86)" to "Program Files" directory.

Run java with non-system locale

2009-01-19T15:31:00.001+03:00

java -Duser.language=en -Duser.region=US JavaClass

Maven repository through socks proxy

2008-11-19T15:40:00.004+03:00

There is the solution how to access remote maven repository through socks proxy.

Just put this string:

set MAVEN_OPTS=-DsocksProxyHost=yourSocksProxyHost -DsocksProxyPort=yourSocksProxyPort

to the beginning of the "apache-maven-2.x.x\bin\mvn.bat" file.

Core icons

2008-11-08T03:42:00.002+03:00

New project: Core icons - evolution of Eclipse icons

Eclipse icons

2008-10-24T02:58:00.007+04:00

Now pictures from Eclipse are available at my Eclipse icons page:

I've created it in few steps:

Downloaded and unzipped eclipse

Extracted all images from eclipse directories, subdirectories, zips and jars*

Filtered only unique files*

Sorted images by dimension (16x16, 24x24, 32x32, etc.)*

Removed large images (that not look like icon)

Created html pages (via PHP script)

* Via my shell scripts.

This is one script from this project:

#!/bin/bash #Find and copy only unique files (with same size and checksums) from $SOURCE directory to $OUTPUT. SOURCE=output OUTPUT=images rm -rf $OUTPUT mkdir -p $OUTPUT uniqProcess() { echo >xqx_unique.idx while read; do echo -ne \\r$REPLY echo $REPLY $(stat -c%s $REPLY)+$(md5sum $REPLY|cut -f 1 -d ' ')+$(cksum $REPLY|cut -f 1 -d ' ')>>xqx_unique.idx done sort -k 2 xqx_unique.idx|uniq -f 1|cut -f 1 -d ' '|xargs -I '{}' cp '{}' $OUTPUT } find $SOURCE -type f |uniqProcess

Tema Siseg

2008-10-19T02:15:00.001+04:00

One more online service - Tema Siseg.

Tema Siseg - online service for conversion of image to HTML table
Service returns HTML table with amount of cells = amount of pixels in the image.

The main idea of this service: Converting image from regular formats to HTML. Now it is possible to show images when it disabled in the browser, to inline images into web pages, and to transfer images through web filters.

Commercial offers? Welcome!

emc

2008-10-17T00:40:00.005+04:00

One more mine project: emc - remote file navigator.

It developed on:

Client side - Flex
Server side - PHP
RPC container - XML

This is just beta version.

It is possible to release complete version (add new functionality or implement another Server side, for example). And I'm looking for the people, who want to use this in their commercial projects.
If you are interested in it, write me.

MD5 online decryption service

2008-10-09T02:02:00.003+04:00

Last week I released new online service: MD5 Online.

It provides online encryption and decryption functionality of MD5 hashes.

Flex - autoscrolable text area

2008-09-20T20:32:00.002+04:00

Need TextArea with automatic scrolling to bottom?
This is not trivial, but simple:

emc\components\AutoScrollableTextArea.as

package emc.components {
import mx.controls.TextArea;

public class AutoScrollableTextArea extends TextArea {
    override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void
    {
        super.updateDisplayList(unscaledWidth, unscaledHeight);
        verticalScrollPosition = textField.numLines;
    }
}
}

For example, it is useful for outputting log information.

PHP - roots list

2008-09-18T23:24:00.017+04:00

Unfortunately, I don't know another way how to resolve all roots (drives) under Windows:

public function getRoots() {
    $roots = array();
    for ($i='A'; $i<'Z'; $i++) {
        $disk=$i.':\\';
        if (is_dir($disk) && is_readable($disk))
        $roots[] = $disk;
    }
    return $roots;
}

Somebody know?

Namespaces for custom Flex components

2008-09-18T23:24:00.014+04:00

Flex (MXML) allow to declare custom components via xmlns declaration.
Like this:

<mx:Box xmlns:mx="http://www.adobe.com/2006/mxml"
         xmlns:emc="emc.components.navigator.*">

This way is useful when amount of custom components not too much and all components are located in the one or two packages.

But what about real namespaces like in Flex itself ("xmlns:mx="http://www.adobe.com/2006/mxml"); for huge amount of components?

It is possible to consolidate declaration of all components in the single file.
Like this:

manifest.xml

<?xml version="1.0"?>

<componentPackage>
    <component id="Navigator" class="emc.components.navigator.Navigator"/>
    <component id="Editor" class="emc.components.editor.Editor"/>
    <component id="Console" class="emc.components.console.Console"/>
    <component id="SmartTruncableLabel" class="emc.components.SmartTruncableLabel"/>
    <component id="AutoScrollableTextArea" class="emc.components.AutoScrollableTextArea"/>
</componentPackage>

put this file into the project sources directory and add this argument to the MXML compiler:

-namespace=http://xantorohara.110mb.com/emc,sources/manifest.xml

and then use this components in the MXML files via this declaration:

<mx:Box xmlns:mx="http://www.adobe.com/2006/mxml"
         xmlns:emc="http://xantorohara.110mb.com/emc">

and insert component into your application:

...
<emc:SmartTruncableLabel id="titleLabel" styleName="filePanelTitleLabel" width="100%" />
...

How do you like it?

Simple URL rewrite rule for Apache

2008-09-18T23:24:00.009+04:00

These strings in the ".htaccess" file redirect HTTP query from "worker.xml" file to "worker.php":

RewriteEngine on
RewriteBase /worker
RewriteRule worker.xml worker.php

So, it is possible to create XML (or another) facade around PHP (or another) server-side implementation.

Enable Flex trace logging

2008-09-18T23:24:00.005+04:00

Just create "C:\Documents and Settings\{UserName}\mm.cfg" file
with this content:

ErrorReportingEnable=1
TraceOutputFileEnable=1

and you will see Flex trace output in the "C:\Documents and Settings\{UserName}\Application Data\Macromedia\Flash Player\Logs\" directory.

PHP - exec output

2008-09-18T23:24:00.002+04:00

This is the simple way how to capture exec output:

<?php

function execOutput($command) {
    $output = array($command);
    exec($command.' 2>&1', $output);
    return implode("\n", $output);
}

echo execOutput('help');
?>

Access logging under Tomcat

2008-09-01T23:32:00.004+04:00

Do you want to get "access.log" file under Apache Tomcat Server as well as under Apache HTTP Server? Like this:

192.168.1.1 - - [25/Aug/2008:15:08:11 +0400] "GET / HTTP/1.1" 200 82777
192.168.1.1 - - [25/Aug/2008:15:08:11 +0400] "GET /js/event-debug.js HTTP/1.1" 200 88582
192.168.1.1 - - [25/Aug/2008:15:08:11 +0400] "GET /js/history-debug.js HTTP/1.1" 200 28540
192.168.1.1 - - [25/Aug/2008:15:08:11 +0400] "GET /js/prototype.js HTTP/1.1" 200 126120
192.168.1.1 - - [25/Aug/2008:15:08:11 +0400] "GET /js/json2.js HTTP/1.1" 200 9490
192.168.1.1 - - [25/Aug/2008:15:08:12 +0400] "GET /css/app.css HTTP/1.1" 200 1937

Just insert one line into the "Engine" section of the "server.xml" file:

<Engine name="Catalina" defaultHost="localhost">
...
    <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs" prefix="access." suffix=".log" pattern="common"/>
...
</Engine>

Also it is possible to collect and filter the set of raised files via this script:

access.sh

#!/bin/bash

cat access.log | cut -f2 -d"\"" access.log | cut -f2 -d" " | egrep -v -f ignore.txt | sort

ignore.txt

^/$
^/JSON-RPC$
^/JSON-RPC-GET\?
//Any other patterns

HowTo run IntelliJ IDEA from the RAM-Drive under Linux

2008-09-01T23:01:00.004+04:00

Sometimes people need to run IntelliJ IDEA at "readonly" systems.
"Readonly" I mean - without unpacking IDEA into the local file system.

These scripts will help extract and start IDEA from the RAM-Drive and remove it after using:

idea-setup.sh

#!/bin/bash

IDEA_TAR_GZ=~/downloads/idea-7.0.3.tar.gz
IDEA_HOME=~/idea/idea
export JDK_HOME=/usr/lib/jvm/java-6-sun
export REQUIRED_JVM_ARGS="-Didea.system.path=$IDEA_HOME/system -Didea.config.path=$IDEA_HOME/config"
      
mkdir $IDEA_HOME

sudo mount -t ramfs none $IDEA_HOME
tar -xz --strip 1 --file $IDEA_TAR_GZ -C $IDEA_HOME

$IDEA_HOME/bin/idea.sh

./idea-clean.sh

idea-clean.sh

#!/bin/bash

IDEA_HOME=~/idea/idea

sudo umount $IDEA_HOME
rm -rf $IDEA_HOME

Of course you should buy IntelliJ IDEA license, get open source license or... use evaluation version.

HowTo find inconsistency between image format and file extension

2008-08-22T17:22:00.009+04:00

Sometimes image files have inconsistency between format and extension.
For example: .jpeg file saved as .png file.

I wrote simple script in order to find such files:

#!/bin/bash

process() {
    while read; do
        diff=`identify -format "%m %e" "$REPLY" | tr [A-Z] [a-z] | egrep -v "^(png png|gif gif|jpg jpg|jpeg jpg|jpeg jpeg)"`
        test -n "$diff" && echo $diff $REPLY
    done
}

find -type f -iregex ".*\.\(png\|gif\|jpg\|jpeg\)$" | process

It outputs information about real file format, file extension and filename in case of
difference between format and extension.
Like this:


jpeg png images/rating_0.png
png gif images/left.gif
gif png images/border_tr.png

Sources of com.sun.net.httpserver.HttpServer

2008-07-11T11:57:00.003+04:00

Sun JRE contains implementation of simple HTTP server.
(in the com.sun.net.httpserver and sun.net.httpserver packages)

But this "HttpServer":

Not a part of Java API.

It is Sun's proprietary component

It works only under Sun JRE >=1.6

His sources are available only as a part of Standard Edition Development Kit Source Release under Java Research License
(see Java™ Platform, Standard Edition 6u3 Source Snapshot Releases jdk-6u3-fcs-src-b05-jrl-24_sep_2007)

But sometimes this implementation is pretty useful (for example here).

String from base64 string, to base64 string in Java

2008-06-24T00:39:00.002+04:00

This is very simple:

import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; ... public static String fromBase64(String in) throws IOException { return new String(new BASE64Decoder().decodeBuffer(in)); } public static String toBase64(String in) { return new String(new BASE64Encoder().encodeBuffer(in.getBytes())); }

Latin

2008-06-24T00:29:00.003+04:00

Sometimes I use this latin text as dummy content in my projects:

"Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Sed felis. Suspendisse vestibulum elit et sapien. Phasellus massa. Nam molestie placerat orci. In eu purus in eros eleifend luctus. Phasellus pede lacus, cursus nec, sollicitudin quis, vehicula in, metus. Vestibulum justo. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Suspendisse justo erat, eleifend ut, tempor quis, placerat vitae, justo. Vestibulum varius, libero et hendrerit pharetra, risus felis dapibus nibh, ac varius tortor odio vel quam. Morbi at velit ac purus pretium ornare. Suspendisse at nibh id purus interdum cursus. Donec feugiat egestas sem. Aenean nisl. Aliquam erat volutpat. Vestibulum et magna. Sed lacinia odio vel pede. Ut eleifend, ante vestibulum suscipit sagittis, pede lorem mollis dolor, eget pulvinar tortor libero eu mauris.

Donec sollicitudin sollicitudin leo. Aenean diam dolor, semper sit amet, malesuada quis, sodales sed, nulla. Nunc aliquam purus vitae est. Pellentesque ut est at sem imperdiet consectetuer. In eros. Nullam pulvinar. Sed risus urna, pharetra ornare, gravida nec, venenatis quis, nisl. Nullam euismod mauris. Praesent ut ipsum quis augue faucibus malesuada. Proin dui mauris, condimentum sit amet, ultricies non, interdum eget, mi.

In rutrum, neque et consectetuer semper, dolor ligula rhoncus lectus, eu egestas nunc quam ut est. Morbi quis turpis adipiscing dui pharetra commodo. Nullam pulvinar nibh non lectus. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Morbi blandit arcu ac urna. Suspendisse felis erat, gravida sed, pulvinar sed, ullamcorper in, purus. Mauris libero. Donec eros neque, tempus a, malesuada sed, ullamcorper a, leo. Pellentesque cursus, sem a pretium porta, mi magna faucibus mauris, sit amet porta quam pede vitae neque. In fermentum, neque et volutpat euismod, arcu libero luctus est, in euismod augue est porttitor mauris. Vivamus a lorem sit amet erat tempus convallis. Integer malesuada odio vitae libero. Proin aliquam. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos hymenaeos. Nunc sodales. Praesent at sem ac purus commodo faucibus. Nam ultricies neque ultrices tortor molestie cursus. Phasellus eget lectus. Maecenas semper dolor et turpis.

Nam iaculis, pede sit amet nonummy dignissim, nulla tellus condimentum mi, vitae mattis mi felis in mi. Mauris et nulla at tellus porttitor posuere. Duis erat ante, bibendum ut, pulvinar in, adipiscing ac, nunc. Sed volutpat augue ac pede. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos hymenaeos. Suspendisse potenti. Curabitur lectus. Suspendisse ultrices, arcu sed condimentum congue, leo elit aliquam risus, et interdum leo erat sit amet ante. Aliquam ac tellus. Proin ut felis. Curabitur volutpat sagittis lacus. Pellentesque tempus tincidunt pede.

Duis leo metus, consectetuer ac, posuere id, iaculis quis, massa. Curabitur pellentesque, pede sit amet pellentesque feugiat, odio justo condimentum eros, non mollis augue ante at ipsum. Nunc iaculis eros eu nibh. Nunc ligula sem, semper id, fringilla et, mollis a, ante. Maecenas viverra nibh sit amet nunc. Aenean rhoncus ante ut nibh. Duis hendrerit lorem sed enim. Donec et velit vitae leo rutrum faucibus. Donec mi. Proin laoreet, tellus at placerat nonummy, erat tellus lobortis metus, luctus sagittis enim urna sit amet odio. Praesent vitae ligula quis velit sagittis iaculis.

Aliquam consequat justo. Nulla facilisi. Mauris eget magna. Donec hendrerit imperdiet libero. Aliquam tincidunt libero sit amet diam suscipit auctor. Phasellus sit amet risus et pede mollis faucibus. Nunc nec purus quis augue pulvinar commodo. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos hymenaeos. Ut porttitor vestibulum lacus. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Maecenas congue.

In hac habitasse platea dictumst. Vestibulum vestibulum facilisis neque. Nunc id elit ut orci volutpat convallis. Vivamus vel urna. Etiam auctor. Pellentesque suscipit eros sit amet purus. Proin cursus dolor id felis. Donec venenatis, nisl sit amet consequat condimentum, tortor leo faucibus risus, ut fermentum ipsum felis nec nibh. Suspendisse mattis adipiscing felis. Maecenas eu magna. Nulla eros odio, nonummy nec, volutpat ut, auctor ac, lacus. Sed nec est. Donec libero est, auctor eu, molestie eu, lacinia ut, elit. Suspendisse quis orci."

HowTo override and substitute document.write function in JavaScript (sample)

2008-06-18T00:15:00.004+04:00

It is pretty simple to wrap document.write function in JavaScript.

For example - using closures:

<script id="source" type="text/javascript">
    function wrapString(str) {
        return "(" + str + ")";
    }
    
    document.write = function(w) {
        return function(s) {
            w.call(this, wrapString(s));
        }
    }(document.write);

    document.write("Hello");
    document.write("world");
</script>

This "advanced piece of engineering" prints string: (Hello)(world)

How do you like it?

HowTo batch remove temporaty files from directory and subdirectories

2008-06-15T14:09:00.001+04:00

Just create .bat file with this content:

@set path= @for /R %%i in (*.tmp *.bak) do @del %%i

and update (*.tmp *.bak) section with your set of files or masks.

HowTo simulate Googlebot

2008-04-27T01:32:00.005+04:00

Googlebot is Google's web crawling robot, which finds and retrieves pages on the web and hands them off to the Google indexer.
Googlebot visits sites with special value in his HTTP request header.

It uses special user-agent string:
"Mozilla/5.0 (compatible; Googlebot/2.1; http://www.google.com/bot.html)"

It is possible to simulate Googlebot from the shell script via wget program.

Like this:

#!/bin/bash

TEST_URL="http://digg.com/"

FIREFOX_USERAGENT_STRING="Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.14) Gecko/20080404 Firefox/2.0.0.14"
GOOGLEBOT_USERAGENT_STRING="Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"

#get page for firefox browser
wget -c --user-agent="$FIREFOX_USERAGENT_STRING" --output-document=firefox.html "$TEST_URL"

#get page for google bot
wget -c --user-agent="$GOOGLEBOT_USERAGENT_STRING" --output-document=googlebot.html "$TEST_URL"

This script may be useful for testing of site's search engine optimization.

...May the Force be with you...

Xml elements and attributes in the ExtJS table

2008-02-28T00:47:00.007+03:00

Ext JS - JavaScript Library is pretty powerful JavaScript/AJAX framework for building of Rich Internet Applications.

I've used it in my last public web project: Ubuntu index.

ExtJS has set of useful UI controls, internal components and strong AJAX, XML and JSON support.

E.g. you can present this XML file:


items.xml

<?xml version="1.0"?>

<items>

    <item id="alien-arena">
        <name>Alien Arena</name>
    </item>

    <item id="nexuiz">
        <name>Nexuiz</name>
    </item>

    <item id="openarena">
        <name>OpenArena</name>
    </item>

</items>

as a table via this HTML + JavaScript code:


table.html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
    <title>ExtJS Table Sample</title>
    <link rel="stylesheet" type="text/css" href="ext/resources/css/ext-all.css"/>
    <script type="text/javascript" src="ext/adapter/ext/ext-base.js"></script>
    <script type="text/javascript" src="ext/ext-all.js"></script>
</head>
<body>

<script type="text/javascript">
    Ext.onReady(function() {
        var reader = new Ext.data.XmlReader({record: "item"},
                [{name: "id", mapping:"@id"}, "name"]);

        var store = new Ext.data.Store({url: "items.xml", reader: reader});

        var columnModel = new Ext.grid.ColumnModel([
        {header: "Id", dataIndex: "id"},
        {header: "Name", dataIndex: "name"}]);

        var table = new Ext.grid.GridPanel({
            store: store,
            height: 200,
            cm: columnModel,
            renderTo: "table"
        });
        store.load();
    });
</script>

<div id="table" style="width:300px; height:200px;"></div>
</body>
</html>

Here is the browser's view:

Linux reference

2008-01-22T02:53:00.000+03:00

I found really useful documentation for Linux beginners.

"This Debian Reference (http://qref.sourceforge.net/) is intended to provide a broad overview of the Debian system as a post-installation user’s guide. It covers many aspects of system administration through shell-command examples. Basic tutorials, tips, and other information are provided for topics including fundamental concepts of the Debian system, system installation hints, Debian package management, the Linux kernel under Debian, system tuning, building a gateway, text editors, CVS, programming, and GnuPG for non-developers."

This book is devoted to Debian system but it is topical for some other Linux systems.

StarCraft (Brood War) under Linux (Wine)

2008-01-22T01:50:00.000+03:00

I use this script to play network StarCraft under wine:

#!/bin/bash

#At first, run "wine setup.exe"

BROODWAR_HOME=/usr/games/broodwar

ipx_interface add -p eth0 802.2 0x39ab0222
cd $BROODWAR_HOME
xinit /usr/bin/wine starcraft.exe

I think it is the best game.

Flash-light from console

2008-01-22T01:43:00.000+03:00

With this script I use my monitor as flash-light in the darkness.

#!/bin/bash

#Switch monitor (CRT or LCD) to flash-light mode.

echo -e "\\033[47;30m"
clear
read
echo -e "\\033[0m"
clear

Java processes viewer

2008-01-16T19:03:00.000+03:00

There is a way how to retrieve information about all running JVMs.
Since Java 1.5 Sun provides sources of jvmstat classes for JVM monitoring.

I've created simple program that is used these classes.
It detects all running JVMs and prints their information.


JavaPS.java


import java.util.Set;
import sun.jvmstat.monitor.HostIdentifier;
import sun.jvmstat.monitor.MonitoredHost;
import sun.jvmstat.monitor.MonitoredVm;
import sun.jvmstat.monitor.StringMonitor;
import sun.jvmstat.monitor.VmIdentifier;

public class JavaPS {
    private static final String[] vmProperties = new String[]{
            "java.property.java.vm.name",
            "java.property.java.vm.vendor",
            "java.property.java.vm.version",
            "java.property.java.home",
            "java.property.java.class.path",
            "java.rt.vmArgs",
            "java.rt.vmFlags",
            "sun.rt.javaCommand"};

    public static void main(String[] args) {
        Set jvms;
        MonitoredHost monitoredHost;

        try {
            monitoredHost = MonitoredHost.getMonitoredHost(new HostIdentifier("localhost"));
            jvms = monitoredHost.activeVms();
        } catch (Exception e) {
            e.printStackTrace();
            return;
        }

        for (Object jvm : jvms) {
            int jvmid = (Integer) jvm;
            System.out.println("Process ID: \t" + String.valueOf(jvmid));
            try {
                VmIdentifier id = new VmIdentifier("//" + jvmid + "?mode=r");
                MonitoredVm vm = monitoredHost.getMonitoredVm(id, 0);
                for (String vmProperty : vmProperties) {
                    System.out.println(vmProperty + ": \t"
                            + ((StringMonitor) vm.findByName(vmProperty)).stringValue());
                }
                System.out.println();
                monitoredHost.detach(vm);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

Aliases for virtual machine's properties have been taken from jdk1.5 sources (jdk-1_5_0-src-scsl.zip) from the file j2se\src\share\classes\sun\jvmstat\perfdata\resources\aliasmap.

Compile this code via command:
javac -classpath %JAVA_HOME%\lib\tools.jar JavaPS.java
and run:
java -classpath .;%JAVA_HOME%\lib\tools.jar JavaPS >JavaPS.txt

jvmstat package locates in tools.jar

Example of results output:


JavaPS.txt

Process ID:  2144
java.property.java.vm.name:  Java HotSpot(TM) Client VM
java.property.java.vm.vendor:  Sun Microsystems Inc.
java.property.java.vm.version:  1.6.0_03-b05
java.property.java.home:  C:\Program Files\Java\jre1.6.0_03
java.property.java.class.path:  .;E:\Devel\jdk1.5.0_09\lib\tools.jar
java.rt.vmArgs:  
java.rt.vmFlags:  
sun.rt.javaCommand:  JavaPS

Process ID:  364
java.property.java.vm.name:  Java HotSpot(TM) Client VM
java.property.java.vm.vendor:  Sun Microsystems Inc.
java.property.java.vm.version:  1.6.0_03-b05
java.property.java.home:  C:\Program Files\Java\jre1.6.0_03
java.property.java.class.path:  SwingSet2.jar
java.rt.vmArgs:  
java.rt.vmFlags:  
sun.rt.javaCommand:  SwingSet2.jar

Simple RTF to XML converter

2008-01-16T00:33:00.000+03:00

RTFEditorKit (javax.swing.text.rtf.RTFEditorKit) from Sun Java API - special class for operations with RTF (Rich Text Format) documents.

I've created java sample that converts RTF document to XML.

From:

to:

This is the source of this converter:


Rtf2XML.java


import javax.swing.text.AbstractDocument.BranchElement;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.BadLocationException;
import javax.swing.text.rtf.RTFEditorKit;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.UnsupportedEncodingException;

public class Rtf2XML {
    private DefaultStyledDocument rtfSource;
    private org.w3c.dom.Document xmlTarget;
    private org.w3c.dom.Element xmlRoot;

    private void expandElement(javax.swing.text.Element rtfElement) {
        for (int i = 0; i < rtfElement.getElementCount(); i++) {
            javax.swing.text.Element rtfNextElement = rtfElement.getElement(i);
            if (rtfNextElement.isLeaf()) {
                try {
                    addElement(rtfNextElement);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            } else {
                expandElement(rtfNextElement);
            }
        }
    }

    private void addElement(javax.swing.text.Element rtfElement)
            throws UnsupportedEncodingException, BadLocationException {

        String style = new String(rtfSource.getLogicalStyle(rtfElement.getStartOffset())
                .getName().getBytes("ISO-8859-1"));

        String text = new String(rtfSource.getText(rtfElement.getStartOffset(),
                rtfElement.getEndOffset() - rtfElement.getStartOffset())
                .getBytes("ISO-8859-1"));

        org.w3c.dom.Element node = xmlTarget.createElement("p");
        node.appendChild(xmlTarget.createTextNode(text));
        node.setAttribute("style", style);
        xmlRoot.appendChild(node);
    }

    public void convert(String sourceFileName) throws Exception {
        rtfSource = new DefaultStyledDocument();
        RTFEditorKit kit = new RTFEditorKit();
        kit.read(new FileInputStream(sourceFileName), rtfSource, 0);

        xmlTarget = DocumentBuilderFactory.newInstance()
                .newDocumentBuilder().newDocument();

        BranchElement rtfRoot = (BranchElement) rtfSource.getDefaultRootElement();
        xmlRoot = xmlTarget.createElement("data");
        expandElement(rtfRoot);
        xmlTarget.appendChild(xmlRoot);

        Transformer t = TransformerFactory.newInstance().newTransformer();
        t.transform(new DOMSource(xmlTarget),
                new StreamResult(new FileOutputStream(sourceFileName + ".xml")));
    }

    public static void main(String[] args) {
        if (args.length != 1) {
            System.err.println("Usage: *.rtf");
            return;
        }
        try {
            new Rtf2XML().convert(args[0]);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

But RTFEditorKit isn't so powerful and friendly as I want.
I think, iText will be better for operations with RTF (and other document formats).

It's the good and free decision.

Simple Java MIDI synthesizer sample

2008-01-10T00:18:00.000+03:00

Another multi-media sample - simplest Java MIDI synthesizer.


MidiSynthesizerSample.java


import javax.sound.midi.*;

public class MidiSynthesizerSample {
  public static void main(String[] args) {
      int[] notes = new int[]{60, 62, 64, 65, 67, 69, 71, 72, 72, 71, 69, 67, 65, 64, 62, 60};
      try {
          Synthesizer synthesizer = MidiSystem.getSynthesizer();
          synthesizer.open();
          MidiChannel channel = synthesizer.getChannels()[0];

          for (int note : notes) {
              channel.noteOn(note, 50);
              try {
                  Thread.sleep(200);
              } catch (InterruptedException e) {
                  break;
              } finally {
                  channel.noteOff(note);
              }
          }
      } catch (MidiUnavailableException e) {
          e.printStackTrace();
      }
  }
}

See example of Java MIDI application:
XenoHarmonica

Simple Java MIDI player sample

2008-01-09T22:43:00.000+03:00

New Year!

New articles,

New site xantorohara.110mb.com,

And new project XenoHarmonica

XenoHarmonica - is a musical project. It is a bayan keyboard emulator, Java MIDI application for personal computers.
Now everybody can play bayan (button accordion).

XenoHarmonica is free for education and non-commercial usage.

Program based on Java MIDI API.
In this article I provide an example of simplest MIDI player.

Maybe somebody else going to create MIDI program :-)


MidiPlayerSample.java


import javax.sound.midi.*;
import java.io.InputStream;
import java.io.IOException;
import java.io.FileInputStream;
import java.io.FileNotFoundException;

public class MidiPlayerSample {

  public static void main(String[] args) {
      try {
          Sequencer sequencer = MidiSystem.getSequencer();
          if (sequencer == null)
              throw new MidiUnavailableException();
          sequencer.open();
          FileInputStream is = new FileInputStream("sample.mid");
          Sequence mySeq = MidiSystem.getSequence(is);
          sequencer.setSequence(mySeq);
          sequencer.start();
      } catch (Exception e) {
          e.printStackTrace();
      }
  }
}

Windows XP hibernate mode problem

2008-01-09T22:11:00.001+03:00

Do you have a problem with Hibernate mode in Windows XP?
And you can't turn on Hibernate mode from Power Options Panel, it says: "The process cannot access the file because it is being used by another process".
I found one crasy method how to resolve this problem on my computer (AMD64/1G RAM/MB Asus M2NE/Video Asus N7600/IDE HDD).

Delete file: WINDOWS\system32\drivers\atapi.sys (it will be restored by Windows).

Manualy enable hibernate mode (now it isn't throw error message).

Switch computer to Hibernate mode.

Is it helpful?

HowTo batch replace string in the set of files

2007-11-22T16:17:00.000+03:00

This script replaces all occurrences of 'oldString' with 'newString' in all files in the current directory and all subdirectories.


xqx_replace.sh

#!/bin/bash

if test -z "$1" -o -z "$2"; then
    echo Replace all occurrences of 'oldString' with 'newString' in all files in the current directory and all subdirectories.
    echo Usage: $0 oldSting newString
    exit
fi

OLDSTRING=$1
NEWSTRING=$2

replace() {
    echo "$1"
    mv "$1" "$1".bak
    sed s/$OLDSTRING/$NEWSTRING/g "$1".bak >"$1"
}

check() {
    while read; do
        if test -n "`grep -l $OLDSTRING \"$REPLY\"`"; then    
            replace "$REPLY"
        fi
    done
}

find . -type f |check

Oracle XE installation problem

2007-11-01T12:03:00.000+03:00

Have a problem with Oracle Database 10g Express Edition?
Oracle is installed but doesn't work?

This is caused by that your account is given from domain server or your system has non-English locale.

HowTo resolve this problem:

Create local user (this user should not be a domain account).

Set OS system locale to English (US or UK, via Regional and Language Options), reboot.

Install Oracle XE under local user (via runas console program or via Run as... from Windows Explorer popup menu).

Open file "Oracle\app\oracle\product\10.2.0\server\NETWORK\ADMIN\sqlnet.ora
and comment (via # symbol) or remove line SQLNET.AUTHENTICATION_SERVICES = (NTS)

Open shell, type sqlplus oracle_user/oracle_password and work with Oracle XE.

HowTo create LDAP users

2007-10-31T01:16:00.000+03:00

LDAP (Lightweight Directory Access Protocol) - not lightweight for my brain.

After some research I found steps how to store users in the LDAP (OpenLDAP server) under Windows.

Change configuration file

slapd.conf

ucdata-path ./ucdata
include  ./schema/core.schema
include  ./schema/cosine.schema
include  ./schema/inetorgperson.schema
include  ./schema/misc.schema
include  ./schema/nis.schema
include  ./schema/openldap.schema


pidfile  ./run/slapd.pid
argsfile ./run/slapd.args

access to *
 by self write
 by users read
 by anonymous read

#######################################################################
# BDB database definitions
#######################################################################

database bdb
suffix  "o=sample company"
rootdn  "cn=Manager,o=sample company"
rootpw  secret
directory ./data
index objectClass eq

Restart LDAP service

restart.bat

net stop OpenLDAP-slapd
net start OpenLDAP-slapd

Create base record

base.ldif

dn: o=sample company
objectclass: organization
objectclass: top
o: sample company

Insert base record into LDAP

base.bat

@echo off
set LDAP_HOME=E:\devenv\tools\OpenLDAP
set BASE="o=sample company"
set D=cn=Manager,%BASE%
set AUTH=-x -w secret -D %D%

%LDAP_HOME%\ldapadd.exe %AUTH% -a -f base.ldif

Create file with users' definitions

user.ldif

dn: cn=Katrien,o=sample company
objectClass: top
objectClass: person
objectClass: inetorgperson
cn: Katrien
sn: none
userPassword: none
mail: katrien@samplecompany.com

dn: cn=Gordon,o=sample company
objectClass: top
objectClass: person
objectClass: inetorgperson
cn: Gordon
sn: none
userPassword: none
mail: Gordon@samplecompany.com

Insert users into LDAP

user.bat

@echo off
set LDAP_HOME=E:\devenv\tools\OpenLDAP
set BASE="o=sample company"
set D=cn=Manager,%BASE%
set AUTH=-x -w secret -D %D%

%LDAP_HOME%\ldapadd.exe %AUTH% -a -f user.ldif

Check LDAP records

search.bat

@echo off
set LDAP_HOME=E:\devenv\tools\OpenLDAP
set BASE="o=sample company"
set D=cn=Manager,%BASE%
set AUTH=-x -w secret -D %D%

%LDAP_HOME%\ldapsearch.exe -LLL %AUTH% -b %BASE% "objectClass=person"

MySQL shell scripting

2007-10-30T22:02:00.000+03:00

MySQL is the best. The best database server. I love it.
I like and appreciate its simplicity, efficiency, small size, good help, cool shell utilities. And its price :-)

I've worked with MySQL many years. And I can't understand some another database systems like Oracle, that big, heavy and high-priced. I can't stand theirs complexity.

You can use this server as you want. You can embed it into your application.
MySQL also pretty good in the console.

You can execute sql script from file e.g.:


data.sql

insert into Sample (name, address) values ('sample name', 'sample address');

with the simple command:


exec.cmd

@echo off
SET DATABASE_HOST=localhost
SET DATABASE_NAME=db
SET DATABASE_USER=root
SET DATABASE_PASSWORD=********

mysql -h %DATABASE_HOST% -u %DATABASE_USER%  -p%DATABASE_PASSWORD%  -e "source data.sql" %DATABASE_NAME%

and dump data from database with this command:


dump.cmd

@echo off
SET DATABASE_HOST=localhost
SET DATABASE_NAME=db
SET DATABASE_USER=root
SET DATABASE_PASSWORD=********

md tables
mysqldump --compact --no-create-info --tab=tables -h %DATABASE_HOST% -u %DATABASE_USER%  -p%DATABASE_PASSWORD%  %DATABASE_NAME%

For these purposes you should have only 2 files from mysql: mysql.exe and mysqldump.exe

Three photos of old boards

2007-10-16T00:36:00.000+04:00

Diamond Monster 3Dfx.

Creative Sound Blaster.

BusLogic SCSI adapter.

Active money

2007-10-06T20:27:00.000+04:00

I was on vacation last week.
And now I have started my new blog:

Active Money

Active money - blog about money.
About coins and paper currency and theirs views.

I will publish the scanned images and photos of money.
At first I'm going to publish Russian money from my family collection.

Welcome!

Java code injection via WinAPI's CreateRemoteThread function

2007-09-12T00:58:00.000+04:00

There is the way to inject some functionality into JVM (Java Virtual Machine) from another process or another JVM.

It works only in Windows NT/200/XP and uses WinAPI functions.
Today I publish this solution.

How it works:

User compiles Injector.class, Injector.dll, Insider.dll from sources (via make.bat)

User starts java application (e.g.: start java -jar %JAVA_HOME%\demo\jfc\Notepad\notepad.jar) in the JVM-1

User recognises the PID (process id) of started application (via Task Manager)

User executes java -Djava.library.path=. Injector (starts JVM-2) and enters PID of JVM-1

JVM-1 calls Injector.dll's native function

Injector.dll calls CreateRemoteThread WinAPI function and loads Insider.dll into JVM-1

Insider.dll attaches to JVM-1 via JNI, defines new class from bytes array and loads it.
!!! In this case class's bytecode stores as a jbyte clazz[] array within the Insider.dll

And then new class works in the JVM-1

Injected class only prints numbers within JVM-1's console:

Sources:


Bin2H.java
Injector.cpp
Injector.java
Insider.java
insider.cpp
make.bat

listed below:


Bin2H.java 

public class Bin2H {
    public static void main(String[] args) throws Exception {
        System.out.print("#include <jni.h>\nconst jbyte clazz[]={");
        for (int i = System.in.read(); i >= 0; i = System.in.read()) 
            System.out.print(Integer.toString(i) + ",");
        System.out.print("};");
    }
}


Injector.cpp

#include <windows.h>
#include <jni.h>
#include "injector.h"


void Inject (unsigned long PID, const char *dllname)
{
    DWORD hLibModule;

    HMODULE hKernel32 = GetModuleHandle (TEXT ("Kernel32"));

    void *hProcess = OpenProcess (PROCESS_CREATE_THREAD | PROCESS_VM_OPERATION |
        PROCESS_VM_WRITE, false, PID);
    int cch = strlen (dllname) + 1;
    void *pLibRemote = VirtualAllocEx (hProcess, NULL, cch, MEM_COMMIT,
        PAGE_READWRITE);

    WriteProcessMemory (hProcess, pLibRemote, (void *) dllname, cch, NULL);

    HANDLE hThread = CreateRemoteThread (hProcess, NULL, 0,
        (PTHREAD_START_ROUTINE)
        GetProcAddress (hKernel32,
        "LoadLibraryA"),
        pLibRemote, 0, NULL);

    WaitForSingleObject (hThread, INFINITE);
    GetExitCodeThread( hThread, &hLibModule );
    CloseHandle (hThread);

    VirtualFreeEx (hProcess, pLibRemote, sizeof (dllname), MEM_RELEASE);

    hThread = CreateRemoteThread (hProcess, NULL, 0,
        (PTHREAD_START_ROUTINE) GetProcAddress (hKernel32,
        "FreeLibrary"),
        (void *) hLibModule, 0, NULL);
    WaitForSingleObject (hThread, INFINITE);
    CloseHandle (hThread);
}

void JNICALL Java_Injector_inject (JNIEnv * env, jclass, jint pid, jstring dll)
{
    try
    {
        Inject (pid, env->GetStringUTFChars (dll, NULL));
    } catch (...)
    {
        MessageBox (NULL, "Exception::Inject", "Injector", MB_ICONERROR);
    }
}


Injector.java 

import java.io.File;
import java.io.IOException;

public class Injector {
    public static native void inject(int pid, String dll);

    public static void main(String[] args) {
        System.loadLibrary("Injector");
        byte[] str = new byte[5];
        try {
            System.in.read(str);
            System.out.println(new File("").getAbsolutePath()+"\\insider.dll");         
            inject(Integer.parseInt(new String(str).trim()), new File("").getAbsolutePath()+"\\insider.dll");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}


insider.cpp 

#include <windows.h>
#include <jni.h>
#include "insider.h"

BOOL APIENTRY
DllMain (HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
  if (ul_reason_for_call == DLL_PROCESS_ATTACH)
    {
      JavaVM *vmBuf;
      JNIEnv *env;
      jsize nVMs;
      jint res = 0;
      jclass resjclass = NULL;
      try
      {
    res = JNI_GetCreatedJavaVMs (&vmBuf, 1, &nVMs);
    if (res != JNI_OK || nVMs < 1)
      {
        MessageBox (NULL, "JVMs not found", "Insider", MB_ICONERROR);
        return FALSE;
      }

      }
      catch (...)
      {
    MessageBox (NULL, "Exception:JNI_GetCreatedJavaVMs", "Insider",
            MB_ICONERROR);
    return FALSE;
      }


      try
      {
    res = vmBuf[0].AttachCurrentThread ((void **) &env, NULL);
    if (res != JNI_OK)
      {
        MessageBox (NULL, "Can't attach to JVM", "Insider", MB_ICONERROR);
        return FALSE;
      }
      }
      catch (...)
      {
    MessageBox (NULL, "Exception:AttachCurrentThread", "Insider",
            MB_ICONERROR);
    return FALSE;
      }

      try
      {
    resjclass = env->DefineClass ("Insider", NULL, clazz, sizeof (clazz));
    if (resjclass == NULL)
      {
        MessageBox (NULL, "Error Define Class", "Insider", MB_ICONERROR);
        return FALSE;
      }
    resjclass = env->FindClass ("Insider");
    if (resjclass == NULL)
      {
        MessageBox (NULL, "Error Load Class", "Insider", MB_ICONERROR);
        return FALSE;
      }
      }
      catch (...)
      {
    MessageBox (NULL, "Exception:DefineClass,FindClass", "Insider",
            MB_ICONERROR);
      }
      try
      {
    vmBuf[0].DetachCurrentThread ();
      }
      catch (...)
      {
    MessageBox (NULL, "Exception:DetachCurrentThread", "Insider",
            MB_ICONERROR);
    return FALSE;
      }

    }

  return TRUE;
}


Insider.java 

//Warning: Make Insider as single class!

public class Insider implements Runnable {
    static {
        Thread t = new Thread(new Insider());
        t.setPriority(Thread.MIN_PRIORITY);
        t.setDaemon(true);
        t.start();
    }

    public void run() {
        int i = 0;
        while (true) {
            System.out.println(i++);
            try {
                Thread.sleep(300);
            } catch (InterruptedException e) {
                break;
            }
        }
    }
}


make.bat

@echo off
call "E:\Devel\Microsoft Visual Studio\VC98\Bin\vcvars32.bat" 
set JAVA_HOME=E:\Devel\jdk1.5.0_09

set PATH=%PATH%;%JAVA_HOME%\bin

rd /Q /S out
md out

javac -d out Injector.java
javah -classpath out Injector
javac -source 1.3 -target 1.1 Insider.java
javac Bin2H.java
type Insider.class |java Bin2H >insider.h
del Bin2H.class
del Insider.class

cl.exe /c -GX /I%JAVA_HOME%\include /I%JAVA_HOME%\include\win32 Injector.cpp
link /DLL /OUT:out/Injector.dll kernel32.lib user32.lib gdi32.lib Injector.obj

cl.exe /c -GX /I%JAVA_HOME%\include /I%JAVA_HOME%\include\win32 Insider.cpp
link /DLL /OUT:out/Insider.dll kernel32.lib user32.lib gdi32.lib %JAVA_HOME%\lib\jvm.lib Insider.obj

del Insider.obj
del Injector.obj
del Injector.h
del Insider.h
del out\Injector.exp
del out\Injector.lib 

echo java -Djava.library.path=. Injector>out\injector.bat
echo start java -jar %JAVA_HOME%\demo\jfc\Notepad\notepad.jar Notepad >out\demo.bat

How do you like it?

You may download these sources from Xantorohara.blogspot.com samples

Blogsource

2007-09-11T23:54:00.000+04:00

I've released new online service: Blogsource

It replaces ampersands, tabs, less/greater braces and prepares source code for posting into blog.

E.g.:

<script type="text/javascript">
    function convert(source, output) {
        var sourceString = document.getElementById(source).value
        var outputString = "<pre>";
        for (var i = 0; i < sourceString.length; i++) {
            var part = sourceString.charAt(i);
            switch (part) {
                case '>':
                    part = "&gt;";
                    break;
                case '<':
                    part = "&lt;";
                    break;
                case '&':
                    part = "&amp;";
                    break;
                case '\t':
                    part = "    ";
                    break;
            }
            outputString += part;
        }
        outputString += "</pre>";
        document.getElementById(output).value = outputString;
    }
</script>

If you prefer shell scripts, you may use this:


sed -e 's/\x26/\&amp;/g;s/\x3c/\&lt;/g;s/\x3e/\&gt;/g' sourcefile.txt | expand -t 4 >sourcefile.blog

In any case:

Welcome

Javascript injection

2007-09-10T21:59:00.000+04:00

There is the way to include javascript into any html pages via 'javascript:' protocol. Internet Explorer and FireFox support this.
Just open web page and replace site's URL with some javascript e.g.: javascript: alert('WOW!');

I've released online tool for web developers that based on this feature - Hyperbox. Developers can use it for design tasks.

It is simple to use:

Open any site (e.g.: google.com).
Replace site's URL with this string:
javascript:(function(){var s=document.createElement('script'); s.src='http://xantorohara.jino-net.ru/hyperbox/hyperbox.js'; s.type='text/javascript'; document.getElementsByTagName('head')[0].appendChild(s); })();
Move it, resize, change color and borders, measure.

This javascript tool is absolutely free for using and modifying.
Everybody may download the script from my site and investigate it.

Lord of the Rings. MSSP, MSDP ring protection

2007-09-09T23:22:00.000+04:00

I was system architect in the telecommunication company several years ago.
And I am the author of the Network Managament System (NMS) for SDH, PDH, Ethernet networks and equipment.
The most interesting things in the SDH/PDH - theirs protection schemes:

MSDP Ring (Dedicated ring). One unidirectional ring for main traffic and one for protection.
MSSP Ring 2-Fiber (Shared ring). 1/2 of bidirectional ring for main traffic and 1/2 for protection.
MSSP Ring 4-Fiber (Shared ring). One bidirectional ring for main traffic and one for protection.

It is possible to use protecting channels for not protected (NOP) traffic while ring works without breaks.

OS input events generation

2007-09-09T22:59:00.000+04:00

The simplest way to generate system input events (mouse and keyboard) is using Robot class from Java API.

Source code that listed below, moves mouse over the screen and presses mouse's button.


JRobot.java

import java.awt.AWTException;
import java.awt.Dimension;
import java.awt.Point;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.event.InputEvent;

public class JRobot {
    private Robot robot = null;

    private Point point = new Point(0, 0);

    private void relativeMouseMove(int x, int y) {
        point.x+=x;
        point.y+=y;
        robot.mouseMove(point.x, point.y);
    }

    private JRobot() {
        try {
            robot = new Robot();
        } catch (AWTException e) {
            e.printStackTrace();
            return;
        }
        robot.setAutoDelay(1);

        Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
        relativeMouseMove(32, screen.height - 8);
        robot.mousePress(InputEvent.BUTTON1_MASK);

        for (int i = 0; i < 256; i++) {
            relativeMouseMove(0, -1);           
        }
        robot.delay(300);
        robot.waitForIdle();
        for (int i = 0; i < 256; i++) {
            relativeMouseMove(1, 0);            
        }
        
    }

    public static void main(String[] args) {
        new JRobot();
    }
}

It is possible to use Robot for the various purposes ;-)

Interactive Graphical System

2007-09-09T22:24:00.000+04:00

In the earliest days of my programming career I wrote many simple-minded programs.

One of them - Interactive Graphical System (IGS), in that (х³+а₁у³+а₂х²у+а₃ху²+а₄х²+а₅у²+а₆ху+а₇х+а₈у+а₉=0) mathematical formula was implemented.

It was written on Borland C++, at university, many years ago...

SWT events capturing

2007-09-09T21:39:00.000+04:00

Year ago I wrote this small SWT application that introduces how grab of SWT events works.


Launcher.java

import java.util.Hashtable;
import java.util.Map;
import java.util.Set;

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.MessageBox;
import org.eclipse.swt.widgets.Shell;

public class Launcher {
    private Shell shell;

    private Map<Integer, String> eventMap = new Hashtable<Integer, String>();
    {
        eventMap.put(SWT.Paint, "Paint");
        eventMap.put(SWT.Selection, "Selection");
        eventMap.put(SWT.DefaultSelection, "DefaultSelection");
        eventMap.put(SWT.Dispose, "Dispose");
        eventMap.put(SWT.FocusIn, "FocusIn");
        eventMap.put(SWT.FocusOut, "FocusOut");
        eventMap.put(SWT.Hide, "Hide");
        eventMap.put(SWT.Show, "Show");
        eventMap.put(SWT.KeyDown, "KeyDown");
        eventMap.put(SWT.KeyUp, "KeyUp");
        eventMap.put(SWT.MouseDown, "MouseDown");
        eventMap.put(SWT.MouseUp, "MouseUp");
        eventMap.put(SWT.MouseDoubleClick, "MouseDoubleClick");
        eventMap.put(SWT.MouseMove, "MouseMove");
        eventMap.put(SWT.Resize, "Resize");
        eventMap.put(SWT.Move, "Move");
        eventMap.put(SWT.Close, "Close");
        eventMap.put(SWT.Activate, "Activate");
        eventMap.put(SWT.Deactivate, "Deactivate");
        eventMap.put(SWT.Iconify, "Iconify");
        eventMap.put(SWT.Deiconify, "Deiconify");
        eventMap.put(SWT.Expand, "Expand");
        eventMap.put(SWT.Collapse, "Collapse");
        eventMap.put(SWT.Modify, "Modify");
        eventMap.put(SWT.Verify, "Verify");
        eventMap.put(SWT.Help, "Help");
        eventMap.put(SWT.Arm, "Arm");
        eventMap.put(SWT.MouseExit, "MouseExit");
        eventMap.put(SWT.MouseEnter, "MouseEnter");
        eventMap.put(SWT.MouseHover, "MouseHover");
        eventMap.put(SWT.Traverse, "Traverse");
    }

    private Listener uniListener = new Listener() {
        public void handleEvent(Event event) {
            String eventName = eventMap.get(event.type);
            if (eventName != null)
                System.out
                        .println(eventName + " \t " + event.widget.getClass());
        }
    };

    private void addHooks(Display display) {
        Set<Integer> eventTypes = eventMap.keySet();
        for (Integer eventType : eventTypes)
            display.addFilter(eventType, uniListener);
    }

    private void removeHooks(Display display) {
        Set<Integer> eventTypes = eventMap.keySet();
        for (Integer eventType : eventTypes)
            display.removeFilter(eventType, uniListener);
    }

    public Launcher() {
        super();
        Display display = new Display();
        shell = new Shell(display);
        shell.setText("SWTAppNQ3");
        shell.setSize(320, 240);
        Button button = new Button(shell, SWT.NONE);
        button.setText("Cool Button");
        button
                .addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
                    public void widgetSelected(
                            org.eclipse.swt.events.SelectionEvent e) {
                        MessageBox messageBox = new MessageBox(shell);
                        messageBox.setMessage("Pressed");
                        messageBox.open();
                    }
                });

        button.pack();
        addHooks(display);

        shell.open();

        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }
        removeHooks(display);
        display.dispose();
    }

    public static void main(String[] args) {
        new Launcher();
    }
}

This program in action:

SWT development quick start

2007-09-09T19:24:00.001+04:00

SWT: The Standard Widget Toolkit - is open source UI toolkit for Java applications.

SWT contains powerful set of widgets - UI components.
SWT applications work fast, because this toolkit based on native OS libraries.
And development of SWT applications is pretty simple.

List of SWT UI components you can see at Widgets page.
Snippets page contains many SWT samples. It is a good idea to download all these examples and review theirs.
Start Eclipse, create new Java project.
Put downloaded snippets into the project's src directory.
Add SWT library to the project's build path from the Eclipse's plugins directory (e.g.: plugins/org.eclipse.swt.win32.win32.x86_3.2.0.v3232m.jar).
Then select on of the snippets and run it.
Does it work? :-)

You may download these sources from Xantorohara.blogspot.com samples

3D Pictures Gallery

2007-09-06T15:40:00.001+04:00

Sometimes I model 3D pictures.
These are mine:

Server from a garbage

2007-09-03T09:37:00.000+04:00

Last week I started my new project, server and site: xantorohara.com

I've compiled this server from a "garbage": old PC board, 133MHz processor, 64MB SIMM memory, carton box, scotch tape, wires...

And it works. Cool, noiseless, energy-efficient, with enough performance for my tasks.
Really, I'm the fan of all old hardware!

Old plates such good!
And I think that reusing of the old hardware will improve ecology on our Earth.

Windows Service Simple Sample

2007-08-29T00:09:00.000+04:00

Some years ago I was C/C++ developer and I wrote several windows services.
I know that writing of service programs is quite difficult for beginners.

In this post I'm publishing simple working example.
This service only beeps with one second's interval after starts.


service.c

#include <windows.h>

HANDLE  hServerStopEvent = NULL;
VOID ServiceBody();
VOID WINAPI ServiceMain(DWORD dwArgc, LPTSTR *lpszArgv);
VOID WINAPI ServiceControlHandler(DWORD dwCtrlCode);
BOOL ReportStatusToSCMgr(DWORD dwCurrentState, DWORD dwWin32ExitCode, DWORD dwWaitHint);


SERVICE_STATUS          ssStatus;
SERVICE_STATUS_HANDLE   sshStatusHandle;

void _cdecl main(int argc, char **argv)
{
    SERVICE_TABLE_ENTRY dispatchTable[] = 
        {{"", (LPSERVICE_MAIN_FUNCTION)ServiceMain }, { NULL, NULL }};
    StartServiceCtrlDispatcher(dispatchTable);
}

void WINAPI ServiceMain(DWORD dwArgc, LPTSTR *lpszArgv)
{
    sshStatusHandle = RegisterServiceCtrlHandler( "", ServiceControlHandler);

    if (!sshStatusHandle)
        goto cleanup;

    ssStatus.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
    ssStatus.dwServiceSpecificExitCode = 0;

    if (!ReportStatusToSCMgr(SERVICE_START_PENDING, NO_ERROR, 3000))
        goto cleanup;

    ServiceBody();

cleanup:
    if (sshStatusHandle)
        (VOID)ReportStatusToSCMgr(SERVICE_STOPPED, NO_ERROR, 0);
    return;
}

VOID WINAPI ServiceControlHandler(DWORD dwCtrlCode)
{
    if(dwCtrlCode==SERVICE_CONTROL_STOP)
    {
        ReportStatusToSCMgr(SERVICE_STOP_PENDING, NO_ERROR, 0);
        if ( hServerStopEvent )
            SetEvent(hServerStopEvent);
    }
    ReportStatusToSCMgr(ssStatus.dwCurrentState, NO_ERROR, 0);
}

BOOL ReportStatusToSCMgr(DWORD dwCurrentState, DWORD dwWin32ExitCode, DWORD dwWaitHint)
{
    if (dwCurrentState == SERVICE_START_PENDING)
        ssStatus.dwControlsAccepted = 0;
    else
        ssStatus.dwControlsAccepted = SERVICE_ACCEPT_STOP;

    ssStatus.dwCurrentState = dwCurrentState;
    ssStatus.dwWin32ExitCode = dwWin32ExitCode;
    ssStatus.dwWaitHint = dwWaitHint;

    if ( ( dwCurrentState == SERVICE_RUNNING ) 
        || ( dwCurrentState == SERVICE_STOPPED ) )
        ssStatus.dwCheckPoint = 0;
    else
        ssStatus.dwCheckPoint++;

    return SetServiceStatus( sshStatusHandle, &ssStatus);
}


//This sample only beeps.
VOID ServiceBody ()
{   
    hServerStopEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
    if (!hServerStopEvent)
        goto cleanup;

    if (!ReportStatusToSCMgr(SERVICE_RUNNING, NO_ERROR, 0))
        goto cleanup;

    do 
    {
        MessageBeep(-1);
    } while (WaitForSingleObject(hServerStopEvent, 1000 )== WAIT_TIMEOUT);

cleanup:
    if (hServerStopEvent)
        CloseHandle(hServerStopEvent);
}

Script for compiling with Visual C++ 6.0:


make_vc6.bat
@call "D:\Program Files\Microsoft Visual Studio\VC98\Bin\vcvars32.bat"
@cl /nologo service.c user32.lib advapi32.lib
@del service.obj

If you use Visual C++ Express, you need additional Platform SDK from Microsoft.

Install (register) service via command:


service_create.bat
sc create "XQX Service" binPath= %CD%\service.exe

Start service via command:


service_start.bat
net start "XQX Service"

Stop service via command:


service_stop.bat
net stop "XQX Service"

Uninstall (remove) service via command:


service_delete.bat
sc delete "XQX Service"

Blog locking

2007-08-28T22:30:00.000+04:00

Last week my blog was locked by Blogger's spam-prevention robots...
It say:
Blogger's spam-prevention robots have detected that your blog has characteristics of a spam blog.

But today Blogger's operators have appologized:
Your blog has been reviewed, verified, and cleared for regular use so that
it will no longer appear as potential spam. If you sign out of Blogger and
sign back in again, you should be able to post as normal. Thanks for your
patience, and we apologize for any inconvenience this has caused.

And now I'm available again :-)

Matrox Mystique Rainbow Runner

2007-08-22T13:38:00.000+04:00

The best item in my collection of computer hardware is video card "Matrox Mystique Rainbow Runner".

This card looks like a sandwich.

It comprises two pieces: main and child.

And also has a set of cables and CDs.

But it works only in Win3.1-Win95, because this card has been released in past century.

HowTo disable speaker in the Linux terminal

2007-08-20T23:51:00.001+04:00

Speaker in the linux console is very tiresome.
I know way how to disable system speaker.

Insert line:
set bell-style none
to the file .input.rc

Execute command:
setterm -blength 0 or setterm -bfreq 0 or echo -ne '\033[11;0]'

Enjoy :-).

HowTo root login without password

2007-08-20T23:21:00.000+04:00

Only add kernel parameter init=/bin/bash at boot time.

If the boot loader is GRUB, change string parameter from:
kernel /boot/vmlinuz-2.6.15-26-386 ...
to:
kernel /boot/vmlinuz-2.6.15-26-386 ... init=/bin/bash

If the boot loader is LILO, enter:
boot: linux init=/bin/sh

! You should have physical access to the linux server.
!! It works only when boot loader not have an own password.

Then you can do everything with root permissions, for example repair system or restore root password.
If you want to disable readonly mode, type mount -o remount,rw / in the command line.

Interleaved table

2007-08-17T10:30:00.000+04:00

Every time I hear question: "How to paint odd and even rows in html table in different colors".

Here is the example how to do it simple:


<html>
<head>

    <style type="text/css">

        .odd {background-color: #eee;}
        .even {background-color: #fff;}

    </style>

    <script type="text/javascript">

        function zebra(tableId)
        {
            var table=document.getElementById(tableId);
            if (table)
            {
                var rows = table.getElementsByTagName("tr");

                for (var i = 0; rows.length > i; i++)
                {
                    rows[i].className = ((i % 2) == 0 ? "odd" : "even");
                }
            }
        }

    </script>
</head>

<body>

<table id="irregular">
    <tr>
        <td>break</td>
        <td>broke</td>
        <td>broken</td>
    </tr>
    <tr>
        <td>buy</td>
        <td>bought</td>
        <td>bought</td>
    </tr>
    <tr>
        <td>catch</td>
        <td>caught</td>
        <td>caught</td>
    </tr>
    <tr>
        <td>forget</td>
        <td>forgot</td>
        <td>forgotten</td>        
    </tr>
</table>


<script type="text/javascript">
    zebra("irregular");
</script>

</body>
</html>

Power Designer - the best UML and database modeling tool

2007-08-15T22:21:00.000+04:00

The best software modeling tool which I've ever used is Power Designer from Sybase.
I've got acquainted with this program some years ago (it was a repackaged version "QDesigner" by Quest Software).

I've really enjoyed developing with this tool.
This tool is very useful and usable, flexible, easy to use and pretty good.

Power Designer CD contains some visual samples.

Object Oriented Model

It is possible to create UML diagrams (classes, sequence, deployment, etc.) and generate source codes (for many programming languages) from the model.

Physical Data Model

Development of a database turns to pleasure. Power Designer can generate SQL scripts with databases and tables definitions. Also it can create test data sets.

I've tested and evaluated some trial versions of Power Designer and I may say "it is the best".

You may download free evaluation copy of Power Designer or buy it.

HowTo check files integrity via shell script

2007-08-14T15:30:00.000+04:00

In order to control integrity of files on my fileserver I've created special script.
It walks around filesystem (in the given directory) and calculates checksums for files or checks their.
If the file has been changed after last check the warning message will be displayed.

Script:


xqx_uintegra.sh 

#!/bin/bash

#Checks files integrity via md5sum utility.
#
#For removal of all *.md5 files, execute: find -name "*.md5" -exec rm {} \;
#Usage:
#       xqx_uintegra.sh "/path/to/directory"


DATE=`date +%Y.%m.%d_%H.%M.%S.%N`
LOG=~/`basename $0`-$DATE.log
touch $LOG

if test ! -w "$LOG"; then
    LOG=/dev/stdout
fi

SHIFT=$[`tput cols`-10]
MOVE="\\033["$SHIFT"G"
DEFAULT="\\033[0;39m"
RED="\\033[1;31m"
GREEN="\\033[1;32m"
YELLOW="\\033[1;33m"
BLUE="\\033[1;34m"

logError_end() {
    echo -e "$MOVE$RED$1$DEFAULT"
    echo -e \\t$1 >>$LOG
}

logOk_end() {
    echo -e "$MOVE$GREEN$1$DEFAULT"
    echo -e \\t$1 >>$LOG
}

logWarning_end() {
    echo -e "$MOVE$YELLOW$1$DEFAULT"
    echo -e \\t$1 >>$LOG
}

checkSum() {
    #$1=file
    echo -en CheckSum:\\t$1
    echo -en CheckSum:\\t$1 >>$LOG
    file=`basename $1`
    dir=`dirname $1`
    (cd $dir && md5sum -c -- $file >/dev/null 2>&1 && logOk_end OK || logError_end ERROR)
}

calcSum() {
    #$1=file
    echo -en CalcSum:\\t$1
    echo -en CalcSum:\\t$1 >>$LOG
    file=`basename $1`
    dir=`dirname $1`
    (cd $dir && md5sum -b -- $file >$file.md5 2>/dev/null && logWarning_end CALCULATED || logError_end ERROR)
}


fin_process() {
    while read; do
        #echo $REPLY
        if test -n "`echo $REPLY | grep '\.md5$'`"; then    
            checkSum $REPLY
        else
            if test ! -f "$REPLY.md5"; then
                calcSum $REPLY
            fi
        fi
    done
}


find $1 -type f | fin_process;
echo 
echo -e "\\033[1;31m"
cat $LOG |grep ERROR
echo -e "\\033[0;39m"

This script works in Linux systems and under Cygwin environment.

Examples of usages:
In the Windows+Cygwin:
bash xqx_uintegra.sh E:/Temp/sun

In the Linux:
xqx_uintegra.sh /home/fileserver

HowTo understand Vi ( Vim ) editor

2007-08-13T20:30:00.001+04:00

"Vim (Vi Improved) is very powerful editor..."
It is true, I know, I like it. Vi is the best editor for the Linux/Unix console.

Have you tried to understand Vi?

Most people don't understand Vi, because they don't like console and command line, it is needlessly for theirs.
Vi is good for servers, embedded and non-GUI systems;
for admins, linux developers and gurus,
but not for normal people, at first look.

You may execute vimtutor in your command line in order to understand Vi.
Vimtutor is great tutorial.

Also Vi supports highlighting for many types of files.

I've created consolidated list of Vi commands and hot keys:


Navigation
h               move cursor left
j               move cursor down
k               move cursor up
l               move cursor right
i, INSERT       edit mode
R               replace mode
ESC             normal mode
CTRL-g          show filename, current location in the file and status
SHIFT-g         goto the end of file
number+SHIFT-g  goto to the line number
%               goto the matching pair for brackets [, ], {, }, (, )
:syntax on      switch text highlight on
:help command   help for the command

Search
/               search text
n               search text again
?               search in the backward direction
SHIFT-N         search text again in opposite direction
:set ic         search ignore cases

Edit
x               delete character under cursor
de              delete to the end of word
dw              delete to the end of word+space
d$              delete to the end of line
d^              delete to the begin of line
dd              delete a whole line

ce,w,$,^        do the same as delete command, but also switch to edit mode 

u               undo the last command
U               restore line to it's original state
CTRL-R          redo the last command

p               put the last deletion after the cursor
o,O             open new empty line below/above the cursor and switch to the edit mode
a               append text after the cursor
A               append text to the end of a line


Replace
r+character     replace character under cursor
:s/old/new      replace old text with new text (once)
:s/old/new/g    replace all old text with new text in the line
:s/old/new/gc   replace all old text with new text in the line, but ask to confirmation
:%s/old/new/g   replace all old text with new text in the file
:#,#s/old/new/g replace all old text with new text between lines in the range #,# 

Common
number+command  repeat command  number of times (e.g.: 2dd deletes two lines, 5j moves five lines down)


File
:q!             exit without changes
:w              save file
:wq             save and exit
:w filename     save file as filename
:#,# w filename save part of file between lines in the range #,#
:r filename     insert the contents of the file
:!command       execute external command

This article is created in Vi!

There are some programs which syntax is partially compatible with Vi: ed, sed (stream editor) and others.
E.g.:
command cat file.txt |sed -e '1,10s/a/A/g' replaces all 'a' with 'A' from 1 to 10 line.

HowTo move objects within the html page via JavaScript

2007-08-11T01:55:00.000+04:00

For one of my web projects I created universal JavaScript for moving any objects within the page. This is my simple Drag and Drop implementation.
I'm publishing this source. I think, it will be illustrative and useful example.

This screenshot shows how to this script works.



<html>

<body>

<style type="text/css">
    .movable {
        position: absolute;
        width: 100px;
        height: 100px;
        background-color: yellow;
        cursor:pointer;
        border:solid 1px gray;
    }
</style>

<script type="text/javascript">

    var posx;
    var posy;
    var zMax = 0;
    var obj;

    function drag_start(itemToMove, e)
    {
        itemToMove.style.zIndex = ++window.zMax;
        if (!e) e = window.event;
        obj = itemToMove;
        posx = e.clientX - parseInt(obj.style.left);
        posy = e.clientY - parseInt(obj.style.top);
        itemToMove.style.cursor="move";
        if (e.preventDefault) e.preventDefault();
        else e.returnValue = false;
    }

    function drag_stop(e)
    {
        if (obj) {
            obj.style.cursor="pointer";            
            obj = null;
        }
    }

    function drag(e)
    {
        if (!obj) return;

        if (!e) e = window.event;

        var height, width;
        if (document.all)
        {
            height = document.body.offsetHeight;
            width = document.body.offsetWidth;
        }
        else if (document.layers)
        {
            height = window.innerHeight;
            width = window.innerWidth;
        }
        var newX = e.clientX - posx;
        var newY = e.clientY - posy;
        if (newX < -obj.clientWidth / 2)
        {
            newX = -obj.clientWidth / 2;
            posx = e.clientX - parseInt(obj.style.left);
        }
        if (newY < -obj.clientHeight / 2)
        {
            newY = -obj.clientHeight / 2;
            posy = e.clientY - parseInt(obj.style.top);
        }

        obj.style.left = newX;
        obj.style.top = newY;

        if (e.preventDefault) e.preventDefault();
        else e.returnValue = false;
    }

    document.onmousemove = drag;
    document.onmouseup = drag_stop;

    document.ondragstart = function()
    {
        return false;
    }
    document.onselectstart = function()
    {
        return false;
    }
</script>

<div class="movable" style="left:100px; top:100px;" onmousedown="drag_start(this,event)"></div>
<div class="movable" style="left:200px; top:200px;" onmousedown="drag_start(this,event)"></div>
</body>
</html>

E.g.: I used this script in my Online Ruler.
You may see how it works, see in action.

HowTo remove service in Windows

2007-08-09T21:11:00.000+04:00

Sometimes it is necessary to remove service from the Service List in the Windows Managment Console.
In the past I used program, which I compiled from the MSDN's sources (MSDN Library - October 2001: Samples\VC98\sdk\winbase\winnt\service).

But I found another way: Windows XP contains special program SC.exe, which can communicates with the Service Controller and installed services (start, stop, remove, create, query, etc.).
After that I use this command in my shell scripts.

E.g.: for removal of MySQL service, execute command:
sc delete MySQL
(! You may restore MySQL service via command mysqld-nt.exe --install)

But if you want to do this from your C++ program, you may use sample's sources from MSDN.

Part of these is listed below:



service.c
...
void CmdRemoveService()
{
    SC_HANDLE   schService;
    SC_HANDLE   schSCManager;

    schSCManager = OpenSCManager(
                        NULL,                   // machine (NULL == local)
                        NULL,                   // database (NULL == default)
                        SC_MANAGER_ALL_ACCESS   // access required
                        );
    if ( schSCManager )
    {
        schService = OpenService(schSCManager, TEXT(SZSERVICENAME), SERVICE_ALL_ACCESS);

        if (schService)
        {
            // try to stop the service
            if ( ControlService( schService, SERVICE_CONTROL_STOP, &ssStatus ) )
            {
                _tprintf(TEXT("Stopping %s."), TEXT(SZSERVICEDISPLAYNAME));
                Sleep( 1000 );

                while( QueryServiceStatus( schService, &ssStatus ) )
                {
                    if ( ssStatus.dwCurrentState == SERVICE_STOP_PENDING )
                    {
                        _tprintf(TEXT("."));
                        Sleep( 1000 );
                    }
                    else
                        break;
                }

                if ( ssStatus.dwCurrentState == SERVICE_STOPPED )
                    _tprintf(TEXT("\n%s stopped.\n"), TEXT(SZSERVICEDISPLAYNAME) );
                else
                    _tprintf(TEXT("\n%s failed to stop.\n"), TEXT(SZSERVICEDISPLAYNAME) );

            }

            // now remove the service
            if( DeleteService(schService) )
                _tprintf(TEXT("%s removed.\n"), TEXT(SZSERVICEDISPLAYNAME) );
            else
                _tprintf(TEXT("DeleteService failed - %s\n"), GetLastErrorText(szErr,256));


            CloseServiceHandle(schService);
        }
        else
            _tprintf(TEXT("OpenService failed - %s\n"), GetLastErrorText(szErr,256));

        CloseServiceHandle(schSCManager);
    }
    else
        _tprintf(TEXT("OpenSCManager failed - %s\n"), GetLastErrorText(szErr,256));
}
...

Profound poetry, Shakespeare Sonnet 66

2007-08-07T01:01:00.000+04:00

The most profound text which I ever read is Shakespeare's "Sonnet 66".


Tired with all these, for restful death I cry,
As, to behold desert a beggar born,
And needy nothing trimm'd in jollity,
And purest faith unhappily forsworn,

And guilded honour shamefully misplaced,
And maiden virtue rudely strumpeted,
And right perfection wrongfully disgraced,
And strength by limping sway disabled,

And art made tongue-tied by authority,
And folly doctor-like controlling skill,
And simple truth miscall'd simplicity,
And captive good attending captain ill:

Tired with all these, from these would I be gone,
Save that, to die, I leave my love alone.

It sounds very beautiful in Russian.


Зову я смерть. Мне видеть невтерпеж
Достоинство, что просит подаянья,
Над простотой глумящуюся ложь,
Ничтожество в роскошном одеянье,

И совершенству ложный приговор,
И девственность, поруганную грубо,
И неуместной почести позор,
И мощь в плену у немощи беззубой,

И прямоту, что глупостью слывет,
И глупость в маске мудреца, пророка,
И вдохновения зажатый рот,
И праведность на службе у порока.

Все мерзостно, что вижу я вокруг...
Но как тебя покинуть милый друг!

Each time when I see an injustice, I recollect these lines.

HowTo fix command history in mc under Ubuntu

2007-08-03T21:28:00.000+04:00

The program which I setup first of all after the Linux installation is mc (Midnight Commander).
It is very friendly and useful for me.

But in Ubuntu there is one problem with mc: shell's commands history is flooded with a garbage and with many ESC-symbols when I use mc.

E.g.:


cd "`echo -e '\057usr'`"
cd "`echo -e '\057usr\057X\061\061R\066\057bin'`"
cd "`echo -e '\057home'`"

I found the way how to fix this problem.
In the file .bashrc string:
export HISTCONTROL=ignoredups
should be replaced with:
export HISTCONTROL=ignoreboth

HowTo convert Windows or DOS text to Linux

2007-08-01T20:38:00.001+04:00

If you write text file in Windows, it won't be displayed correctly in Linux, because Windows' editors add carriage return symbol (\^) to the end of each line.
I wrote very simple (but useful) script to migrate text files from Windows to Linux.
Here it is:


dos2linux.sh

#!/bin/bash

cat $1 | tr -d '\r' >$1.fixed

Command "./dos2linux.sh text.txt" reads file "text.txt" and writes fixed file to "text.txt.fixed".

It works on Linux/Unix platforms or under Cygwin environment.

HowTo synchronize directories

2007-07-31T21:49:00.000+04:00

Sometimes it is necessary to synchronize data between desktop computer and notebook, PC and PocketPC, main and backup server or between directories within one system.
I wrote and use script to this.
This script synchronizes one directory with another.

E.g.: if you have directory "master" with these files:
master/file1.txt
master/file2.txt
master/dir1
master/dir1/file3.txt
master/dir1/file4.txt

and if you want to synchronize it with "slave" directory,
you may type this command:
./xqx_usync.sh master slave
After execution of this command, "slave" directory will contain all files from "master":
slave/dir1
slave/dir1/file3.txt
slave/dir1/file4.txt
slave/file1.txt
slave/file2.txt

At first thought, this action looks like copy, but if files in the "master" directory is changed, then after execution of this command again, all data in "slave" will be replaced with new data from "master" directory. Also, if you add new file to the "master" directory, it will be copied into "slave". This script wraps "rsync" command, that fast and high-performance.


xqx_usync.sh

#!/bin/bash

#This script synchronizes <master> and <slave> directories.

MASTER=$1/
SLAVE=$2/

echo -n Syncing $SLAVE with $MASTER...

if test -z "$MASTER" -o ! -e "$MASTER"; then
echo "Usage: usync <master directory> <slave directory>"
exit
fi

if test -z "$SLAVE"; then
SLAVE=.
fi

rsync --archive $MASTER $SLAVE
echo OK

This script is created with Ubuntu Linux.

HowTo make Ubuntu mirror

2007-07-30T17:24:00.000+04:00

"Ubuntu 6.06 LTS (Dapper Drake)" is my favorite OS (unfortunately, my previous favorite: "RedHat 7.2 (Enigma)" is out of date for modern hardware and software).

Ubuntu 6.06 LTS is the best solution for modern computers, because it is stable, efficient, user friendly and long term supported (Desktop Edition to 2009 and Server Edition to 2011).

But, it is necessary to have wide and persistent Internet connection for updates and installing new packages. It is a good idea to create local "hard" copy of all packages from Ubuntu's site. I wrote script for this purposes and successfully use it.

This script creates FULL (~50G) mirror of "Ubuntu 6.06 LTS (Dapper Drake)".
It downloads all binary and source packages for both i386 and amd64 platforms.


xqx_mirror_dapper.sh

#!/bin/bash -x

DATE=`date +%Y.%m.%d_%H.%M.%S.%N`
LOG=~/`basename $0`-$DATE.log
touch $LOG

if test ! -w "$LOG"; then
   LOG=/dev/stdout
fi

DIST=dapper

/usr/bin/debmirror -m --passive --method=ftp --progress --host=archive.ubuntulinux.org --root=ubuntu \
   --dist=$DIST,$DIST-updates,$DIST-security,$DIST-proposed,$DIST-backports \
   --section=main,multiverse,universe,restricted --arch=i386,amd64 \
   --ignore-release-gpg --timeout=999 $DIST |tee $LOG

/usr/bin/debmirror -m --passive --method=http --progress --host=archive.canonical.com --root=ubuntu \
   --dist=$DIST-commercial --section=main --arch=i386,amd64 \
   --ignore-release-gpg --timeout=999  $DIST-commercial |tee -a $LOG

If you don't need sources, you may fix this script and add "--nosource" option to the "dembirror" command. Or you may select your own platform with the "--arch=" option.

When mirror created, you should switch your system to it.
I also created script for this. Here it is:


xqx_apt_update_dapper.sh

#!/bin/bash

if test -z "$1"; then
   echo "Update system from new mirror."
   echo "Usage: $0 <folder with mirrors>"
   exit
fi

DIST=dapper
MIRRORS=$1

cat >/etc/apt/sources.list <<EOF
deb file://$MIRRORS/$DIST/ $DIST main universe multiverse restricted
deb file://$MIRRORS/$DIST/ $DIST-updates main universe multiverse restricted
deb file://$MIRRORS/$DIST/ $DIST-security main universe multiverse restricted
deb file://$MIRRORS/$DIST/ $DIST-backports main universe multiverse restricted
deb file://$MIRRORS/$DIST/ $DIST-proposed main universe multiverse restricted
deb file://$MIRRORS/$DIST-commercial/ $DIST-commercial main
EOF

echo -e "\\033[1;32m"
cat /etc/apt/sources.list
echo -e "\\033[0;39m"

echo "Continue with 'apt-get update'? [y/n]"
read
if test $REPLY = y ; then
   apt-get update
else
   exit
fi

echo "Continue with 'apt-get upgrade'? [y/n]"
read
if test $REPLY = y ; then
   apt-get upgrade
else
   exit
fi

HowTo make temporary directory

2007-07-27T14:59:00.000+04:00

I use this script for making temporary directories:


xqx_utemp.sh

#!/bin/bash

#Creates temporary folder with unique name (current date and time).

DATE=`date +%Y.%m.%d_%H.%M.%S.%N`
mkdir $DATE

Also, it is possible to create temporary directory via mktemp utility, but my script is more suitable for me.

Portals and Portlets with GWT modules

2007-07-26T14:16:00.000+04:00

Last week I considered possibility of using portlets and GWT modules together (i.e.: GWT inside portlet's window).
And I'm coming to conclusion that it works. And it works pretty good.

I created several portlets with GWT modules, and also I wrapped some of my GWT applications in a portlets.

One of them - ChatPortal (simple application for messaging).

First edition of ChatPortal worked well. But I couldn't put several instances of ChatPortlet windows into the page and couldn't move portlet's window within the page.

I investigated these problems and found solution how to resolve theirs.

I changed some ChatPortal's code and Second edition works excellent!

Now I'm using a "-xs" ("cross-site") version of my module's, which GWT (v1.4) compiler produces.
I.e.: instead of gwt.js or xqx.web.chat.Chat.nocache.js scripts I use xqx.web.chat.Chat-xs.nocache.js.

And also I found way how to have several windows instances for one portlet within one page. I wrote function, which performs tree-walking over the HTML DOM and finds places where to put my widgets.

See sources below, they'll say more.

Dashboard with several instances of portlets with same GWT modules

Moving of portlet with GWT module


ChatPortlet.java 
public class ChatPortlet extends GenericPortlet {

 AtomicInteger counter=new AtomicInteger(0);

 protected void doView(RenderRequest renderRequest, RenderResponse renderResponse) throws PortletException, IOException {
  renderResponse.setContentType("text/html");
  PrintWriter writer = renderResponse.getWriter();
  writer.println("<script language='javascript' src='" + renderRequest.getContextPath() + "/xqx.web.chat.Chat-xs.nocache.js'></script>");
  writer.println("<div id='xqx_web_chat_Chat-"+counter.incrementAndGet()+"'></div>");
  writer.close();
 }

 ...
}

Chat.java
package xqx.web.chat.client;
...
public class Chat implements EntryPoint {
...
 private FlowPanel messagesPanel = new FlowPanel();
 private ScrollPanel messagesScrollPanel = new ScrollPanel(messagesPanel);

 private TextArea inputTextArea = new TextArea();
 private ScrollPanel inputScrollPanel = new ScrollPanel(inputTextArea);
...
 public void onModuleLoad() {

  messagesScrollPanel.setStyleName("xqx_messagesScrollPane");
  messagesScrollPanel.addStyleName("xqx_etchedBorder");

  inputTextArea.setStyleName("xqx_input");
...

  String slotId = getEmptySlotId(RootPanel.getBodyElement(), "xqx_web_chat_Chat");
  RootPanel rootPanel = RootPanel.get(slotId);

  if (rootPanel != null) {
...
   rootPanel.add(messagesScrollPanel);
   rootPanel.add(inputScrollPanel);
   rootPanel.add(sendButton);
...
  }

...
 }

 private String getEmptySlotId(Element element, String idPrefix) {
  int count = DOM.getChildCount(element);
  if (count == 0) {
   String id = DOM.getElementAttribute(element, "id");
   if (id != null && id.startsWith(idPrefix)) {
    return id;
   }
  } else {
   for (int i = 0; i < count; i++) {
    String id = getEmptySlotId(DOM.getChild(element, i), idPrefix);
    if (id != null)
     return id;
   }
  }
  return null;
 }

 private void printMessages(Message[] messages) {
...
 }
}

I use GWT v1.4 beta and JBoss Portal 2.6.

You may download these sources from Xantorohara.blogspot.com samples

HowTo make backup via tar.bz2

2007-07-25T21:03:00.000+04:00

Tar (with bzip2 compression) is the best tool for making archive backups.
I wrote simple script, that creates backups of files or directories.
It creates backups with unique (depended on date) prefix.

E.g.: it creates file Xantorohara-2007.07.25_21.11.19.749614000.tar.bz2
from directory Xantorohara via command xqx_ubackup.sh Xantorohara


xqx_ubackup.sh

#!/bin/bash

if test -z "$1"; then
    echo "Create backup archive with unique (depended on date) name."
    echo "Usage: $0 <target file or folder> <(optional) path, where to put archive>"
    exit
fi

DATE=`date +%Y.%m.%d_%H.%M.%S.%N`
if test -z "$2"; then
    tar -cjf ./"$1"-$DATE.tar.bz2 "$1"
else
    tar -cjf "$2"/"$1"-$DATE.tar.bz2 "$1"
fi

JBoss Portal and Proxy Server

2007-07-24T17:51:00.001+04:00

"News" and "Weather" pages didn't work in my JBoss Portal.
My computer located in the the local network area and I use Internet via HTTP proxy server.

Today I found a solution how to configure my JBoss Portal in order to connect it with Internet.

The simplest way is to add specific properties to the JAVA_OPTS variable.

I added one string at the beginning of run.bat file:


set JAVA_OPTS=-Dhttp.proxyHost=<Proxy Host> -Dhttp.proxyPort=<Proxy Port>

In Linux it should be:


JAVA_OPTS="-Dhttp.proxyHost=<Proxy Host> -Dhttp.proxyPort=<Proxy Port>"

You should replace values "Proxy Host" and "Proxy Port" with actual data for your network.

Now all portlets are working and I'm happy.

HowTo make a copy of web site

2007-07-23T18:23:00.000+04:00

Sometimes it is necessary to copy content from the remote web site.
GNU Wget is the best solution for this purpose.
Wget is a standard utility in most of Linux-like systems (and in the Cygwin) for downloads of files from the Web.

Good idea to wrap wget into the shell script like this:


xqx_teleport.sh

#!/bin/bash

if test -z "$1"; then
    echo "Create local copy of http site."
    echo "Usage: echo $0 <target URL>"
    exit
fi

DATE=`date +%Y.%m.%d_%H.%M.%S.%N`
LOG=~/`basename $0`-$DATE.log
touch $LOG

if test ! -w "$LOG"; then
    LOG=/dev/stdout
fi

wget --continue --recursive --no-parent --relative --convert-links $1 |tee $LOG

For example, if you want to copy documents from the site "http://www.w3.org/TR/xhtml11" you should execute this command:

xqx_teleport.sh http://www.w3.org/TR/xhtml11

HowTo make backup via Rar

2007-07-20T15:18:00.000+04:00

Just use this command:


In Windows
 rar a -r -m5 -k -s -ag-YYYY.MM.DD_HH.MM.SS.N %1.rar %1

You should put this command into .cmd or .bat file e.g.: xqx_ubackup_rar.cmd
Usage: xqx_ubackup_rar.cmd file-or-folder-for-backup

Tip: You may copy rar.exe from WinRar installation directory to the Windows directory and use it in command line.

In Linux
 rar a -r -m5 -k -s -ag-YYYY.MM.DD_HH.MM.SS.N $1.rar $1

You should put this command into .sh file e.g.: xqx_ubackup_rar.sh

Usage: xqx_ubackup_rar.sh file-or-folder-for-backup

HowTo backup Java project

2007-07-19T12:08:00.000+04:00

This topic may be helpful for Java developers, who use Ant and want to backup their Java projects (especially for developers, who don't use any of Version Control Systems like CVS, SVN, etc.).

I've created simple Ant script for backup purposes. This script creates archive with unique (time depended) name.

E.g.: If project (project's folder) has name "Eclipsoid", it will be packed to "Eclipsoid-2007.07.19_11.52.00.tar.bz2" archived file.

You may insert "ubackup" target into your project's build.xml file or use this script standalone.


build.xml

<project default="ubackup" basedir=".">
 <target name="ubackup">
  <tstamp>
   <format property="backuptime" pattern="yyyy.MM.dd_HH.mm.ss"/>
  </tstamp>
  <basename property="currentdir" file="."/>
  <property name="backupfilename" value="${currentdir}-${backuptime}"/>
  <tar destfile="../${backupfilename}.tar.bz2" compression="bzip2" basedir="../${currentdir}"/>
 </target>
</project>

Inter Portlet Communication in JBoss Portal 2.6

2007-07-18T14:48:00.000+04:00

Have you tried to deploy HelloWorldIPC portlet (from Portlet Swap) into JBoss Portal 2.6?
I've tried, but it was unsuccessful.
This portlet works in previous version of JBoss Portal, but doesn't work in 2.6, because some APIs in JBoss Portal was slightly changed.
I've read some developers documentation and found way to resolve this problem, and I created sample of Inter Portlet Communication for JBoss Portal 2.6.
I think, it will be useful for developers. You may see sources below.


Project files

./build.properties
./build.xml
./local.properties
./src
./src/META-INF
./src/META-INF/jboss-service.xml
./src/WEB-INF
./src/WEB-INF/portlet-instances.xml
./src/WEB-INF/portlet.xml
./src/WEB-INF/web.xml
./src/WEB-INF/xlamipc-object.xml
./src/xqx
./src/xqx/web
./src/xqx/web/xlam
./src/xqx/web/xlam/XLamMasterPortlet.java
./src/xqx/web/xlam/XLamSlavePortlet.java

jboss-service.xml

<?xml version="1.0" encoding="UTF-8"?>

<server>
    <mbean code="org.jboss.portal.core.event.PortalEventListenerServiceImpl"
           name="portal:service=ListenerService,type=ipc_listener" xmbean-dd=""
           xmbean-code="org.jboss.portal.jems.as.system.JBossServiceModelMBean">
        <xmbean/>
        <depends
            optional-attribute-name="Registry" proxy-type="attribute">portal:service=ListenerRegistry
        </depends>
        <attribute name="RegistryId">ipc_listener</attribute>
        <attribute name="ListenerClassName">xqx.web.xlam.XLamSlavePortlet$Listener</attribute>
    </mbean>   
</server>

portlet-instances.xml

<?xml version="1.0" standalone="yes"?>
<deployments>
    <deployment>
        <instance>
            <instance-id>XLamMasterPortletInstance</instance-id>
            <portlet-ref>XLamMasterPortlet</portlet-ref>
        </instance>
    </deployment>
    <deployment>
        <instance>
            <instance-id>XLamSlavePortletInstance</instance-id>
            <portlet-ref>XLamSlavePortlet</portlet-ref>
        </instance>
    </deployment>
    
</deployments>

portlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<portlet-app xmlns="http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd"
             version="1.0">

    <portlet>
        <portlet-name>XLamMasterPortlet</portlet-name>
        <portlet-class>xqx.web.xlam.XLamMasterPortlet</portlet-class>
        <supports>
            <mime-type>text/html</mime-type>
            <portlet-mode>VIEW</portlet-mode>
            <portlet-mode>HELP</portlet-mode>
        </supports>
        <portlet-info>
            <title>XLam Master Portlet</title>
        </portlet-info>
    </portlet>

    <portlet>
        <portlet-name>XLamSlavePortlet</portlet-name>
        <portlet-class>xqx.web.xlam.XLamSlavePortlet</portlet-class>
        <supports>
            <mime-type>text/html</mime-type>
            <portlet-mode>VIEW</portlet-mode>
        </supports>
        <portlet-info>
            <title>XLam Slave Portlet</title>
        </portlet-info>
    </portlet>
   
</portlet-app>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
         xmlns="http://java.sun.com/xml/ns/j2ee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
</web-app>


xlamipc-object.xml

<?xml version="1.0" encoding="UTF-8"?>
<deployments>
    <deployment>
        <if-exists>overwrite</if-exists>
        <parent-ref>default</parent-ref>
        <page>
            <page-name>XLamIPC</page-name>
            <listener>ipc_listener</listener>
            <window>
                <window-name>XLamMasterPortletWindow</window-name>
                <instance-ref>XLamMasterPortletInstance</instance-ref>
                <region>left</region>
                <height>0</height>
            </window>

            <window>
                <window-name>XLamSlavePortletWindow</window-name>
                <instance-ref>XLamSlavePortletInstance</instance-ref>
                <region>center</region>
                <height>0</height>
            </window>
        </page>
    </deployment>

</deployments>

XLamMasterPortlet.java

package xqx.web.xlam;


import javax.portlet.ActionRequest;
import javax.portlet.ActionResponse;
import javax.portlet.GenericPortlet;
import javax.portlet.PortletException;
import javax.portlet.RenderRequest;
import javax.portlet.RenderResponse;
import java.io.IOException;
import java.io.PrintWriter;

public class XLamMasterPortlet extends GenericPortlet
{
    protected void doView(RenderRequest renderRequest, RenderResponse renderResponse) throws PortletException, IOException
    {
        renderResponse.setContentType("text/html");
        PrintWriter writer = renderResponse.getWriter();
        writer.println("<form action='" + renderResponse.createActionURL() + "' method='post'>");
        writer.println("<input name='txt' type='text'/>");
        writer.println("<input type='submit' value='Send to Slave' />");
        writer.println("</form>");
        writer.close();
    }

    protected void doHelp(RenderRequest renderRequest, RenderResponse renderResponse) throws PortletException, IOException
    {
        renderResponse.setContentType("text/html");
        PrintWriter writer = renderResponse.getWriter();
        writer.write("Visit <a href='http://xantorohara.blogspot.com/'>Xantorohara blog</a> for another info.");
        writer.close();
    }

    public void processAction(ActionRequest actionRequest, ActionResponse actionResponse) throws PortletException, IOException
    {
        //prevent super exception
    }
}

XLamSlavePortlet.java

package xqx.web.xlam;

import org.jboss.portal.WindowState;
import org.jboss.portal.api.node.PortalNode;
import org.jboss.portal.api.node.event.PortalNodeEvent;
import org.jboss.portal.api.node.event.PortalNodeEventContext;
import org.jboss.portal.api.node.event.PortalNodeEventListener;
import org.jboss.portal.api.node.event.WindowActionEvent;

import javax.portlet.ActionRequest;
import javax.portlet.ActionResponse;
import javax.portlet.GenericPortlet;
import javax.portlet.PortletException;
import javax.portlet.PortletSecurityException;
import javax.portlet.RenderRequest;
import javax.portlet.RenderResponse;
import java.io.IOException;
import java.io.PrintWriter;

public class XLamSlavePortlet extends GenericPortlet
{
    public static class Listener implements PortalNodeEventListener
    {
        public PortalNodeEvent onEvent(PortalNodeEventContext context, PortalNodeEvent event)
        {
            PortalNode node = event.getNode();
            String nodeName = node.getName();
            WindowActionEvent newEvent = null;
            if (nodeName.equals("XLamMasterPortletWindow") && event instanceof WindowActionEvent)
            {
                WindowActionEvent wae = (WindowActionEvent) event;
                PortalNode windowB = node.resolve("../XLamSlavePortletWindow");
                if (windowB != null)
                {
                    newEvent = new WindowActionEvent(windowB);
                    newEvent.setMode(wae.getMode());
                    newEvent.setWindowState(WindowState.MAXIMIZED);
                    newEvent.setParameters(wae.getParameters());
                    return newEvent;
                }
            }
            return context.dispatch();
        }
    }

    public void processAction(ActionRequest request, ActionResponse response) throws PortletException, PortletSecurityException, IOException
    {
        String txt = request.getParameter("txt");
        if (txt != null)
        {
            response.setRenderParameter("txt", txt);
        }
    }


    protected void doView(RenderRequest renderRequest, RenderResponse renderResponse) throws PortletException, PortletSecurityException, IOException
    {
        renderResponse.setContentType("text/html");
        PrintWriter writer = renderResponse.getWriter();
        writer.write("Message from Master:");
        String txt = renderRequest.getParameter("txt");
        writer.println("txt: " + txt);
        writer.close();
    }
}

build.properties

project.name=XLamIPC

build.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
    
<project name="xlam" default="war">

    <property file="local.properties"/>
    <property file="build.properties"/>

    <property name="build" value="build"/>
    <property name="jarfile" value="${project.name}.jar"/>
    <property name="warfile" value="${project.name}.war"/>
    <property name="sarfile" value="${project.name}.sar"/>

    <path id="classpath">
        <fileset dir="${jbossportal.lib}" includes="**/*.jar"/>
    </path>

    <target name="clean">
        <delete dir="${build}"/>
    </target>

    <target name="jar" depends="clean">
        <mkdir dir="${build}/bin"/>
        <javac srcdir="src" destdir="${build}/bin" classpathref="classpath" debug="true"/>
        <jar basedir="${build}/bin" jarfile="${build}/${jarfile}"/>
    </target>

    <target name="war" depends="jar">
        <copy file="${build}/${jarfile}" todir="${build}/war/WEB-INF/lib"/>
        <copy todir="${build}/war/WEB-INF">
            <fileset dir="src/WEB-INF"/>
        </copy>
        <jar basedir="${build}/war" jarfile="${build}/${warfile}"/>
    </target>

    <target name="sar" depends="war">
        <copy file="${build}/${warfile}" todir="${build}/sar"/>
        <copy file="${build}/${jarfile}" todir="${build}/sar/lib"/>
        <copy todir="${build}/sar/META-INF">
            <fileset dir="src/META-INF"/>
        </copy>
        <jar basedir="${build}/sar" jarfile="${build}/${sarfile}"/>
    </target>

    <target name="undeploy">
        <delete file="${jbossportal.node}/deploy/${sarfile}"/>
    </target>

    <target name="deploy" depends="undeploy, sar">
        <copy file="${build}/${sarfile}" todir="${jbossportal.node}/deploy"/>
    </target>
</project>

local.properties (* You should replace paths with your real data)

jdk.home=E:/devenv/tools/jdk-1.5.0_04

jbossportal.home=E:/devenv/tools/jboss-portal-2.6
jbossportal.node=${jbossportal.home}/server/default
jbossportal.lib=${jbossportal.node}/deploy/jboss-portal.sar/lib

You may download these sources from Xantorohara.blogspot.com samples

HowTo post html code into blog

2007-07-17T17:51:00.000+04:00

Sometimes bloggers need to publish some text, which not displayed correctly into their blog.

For example, you can't post this html directly into your blog:


<html>
<head>
    <title>XLam</title>
</head>
<body>
<script language='javascript' src='xqx.web.xlam.XLam.nocache.js'></script>
<div id='uid'></div>
</body>
</html>

but you can convert it into this format:


&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;XLam&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;script language='javascript' src='xqx.web.xlam.XLam.nocache.js'&gt;&lt;/script&gt;
&lt;div id='uid'&gt;&lt;/div&gt;
&lt;/body&gt;
&lt;/html&gt;

and then successfully publish it.

For this purpose, bloggers may use this script:


#!/bin/bash

#This simple shell script replaces symbols in the given xml/html file and writes it to file file.blog
#Symbols to replace:
# '<' with &lt;
# '>' with &gt;
# '&' with &amp;
#
#Usage: html2blog.sh file

sed -e 's/\x26/\&amp;/g;s/\x3c/\&lt;/g;s/\x3e/\&gt;/g' $1 >$1.blog

It works on Linux/Unix platforms or under Cygwin environment.

GWT. Multiple widget's instances.

2007-07-16T18:43:00.001+04:00

Portlets and GWT look nice together. At first sight.
There is one problem in their cooperation: we can't use multiple instances of same GWT modules in one html page, so we can't build normal portlet.

For example, I have simple GWT module with this entry point:


public class XLam implements EntryPoint {
...
 public void onModuleLoad()
 {
     RootPanel.get("unique_html_element_id").add(somewidget);
 }
}

And I would like to add this GWT module into my portlet. For this case I write code:


public class XLamPortlet extends GenericPortlet
{
 protected void doView(RenderRequest renderRequest, RenderResponse renderResponse) throws PortletException, PortletSecurityException, IOException
 {
  ...
     writer.println("<script language='javascript' src='" + renderRequest.getContextPath() + "/xqx.web.xlam.XLam.nocache.js'></script>");
     writer.println("<div id='unique_html_element_id'></div>");
     ...
 }
}

When I try to place two same portlets into one page I get collision between GWT instances, of course.

I think, that should be way to resolve this problem and I'm trying to find it.

Has someone any solution for this?

Today I've researched JavaScript, which generated by GWT compiler.
I found some ways how to resolve this problem.

It is possible to change some parts of the *.js compiled code, e.g.:.


Rewrite in *.cache.html
..
function wq(a)
{
    hh(pi('unique_html_element_id'), a.b);
    hh(pi($wnd.unique_html_element_id), a.b);
    a.c = lq(new kq(), a);
    id(a.c, 1000);
}
...
Define variables 'on the fly' in *.nocache.js
...
var unique_html_element_id='unique_html_element_id';
...

Or, maybe, rewrite or append additional parameters to some functions like this:


function gwtOnLoad(b, d, c)

But all these are dead-end ways :-(

I think, Google may create useful mechanism for this.

How? I mean, via special parameter in EntryPoint.onModuleLoad() function.

GWT Team, it is really necessary for many web developers!

Portlets and GWT

2007-07-13T18:50:00.001+04:00

I've tried to search any useful samples of development Portlets with GWT.
But I found only one such sample: Developing_Portlets_with_GWT.

Now I'm investigating possibility of development JSR168 Portlets together with Google Web Tolkit (I'm using JBoss Portal 2.6 and GWT 1.4).

This subject too interesting for me, and, I think, for many other developers, because:

GWT is very useful stuff for development AJAX- based web applications.
JBoss Portal is powerful and popular platform for this.

If these technologies work together, it will be great!

But there are problems and questions present on this way. I'm going to say about these problems in next posts.
This post about simple portlet based on GWT:

This portlet only receives time from server every second and repaints this time.
There are some source code presented below (I think it helps for someone).


Project files

./build.properties
./build.xml
./local.properties
./src
./src/WEB-INF
./src/WEB-INF/portlet-instances.xml
./src/WEB-INF/portlet.xml
./src/WEB-INF/web.xml
./src/WEB-INF/xlam-object.xml
./src/xqx
./src/xqx/web
./src/xqx/web/xlam
./src/xqx/web/xlam/client
./src/xqx/web/xlam/client/rpc
./src/xqx/web/xlam/client/rpc/XLamService.java
./src/xqx/web/xlam/client/rpc/XLamServiceAsync.java
./src/xqx/web/xlam/client/Time.java
./src/xqx/web/xlam/client/XLam.java
./src/xqx/web/xlam/public
./src/xqx/web/xlam/public/XLam.html
./src/xqx/web/xlam/server
./src/xqx/web/xlam/server/XLamServiceImpl.java
./src/xqx/web/xlam/XLam.gwt.xml
./src/xqx/web/xlam/XLamPortlet.java

portlet-instances.xml

<?xml version="1.0" standalone="yes"?>
<deployments>
<deployment>
  <instance>
      <instance-id>XLamPortletInstance</instance-id>
      <portlet-ref>XLamPortlet</portlet-ref>
  </instance>
</deployment>
</deployments>

portlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<portlet-app xmlns="http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd
        http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd"
       version="1.0">

<portlet>
  <portlet-name>XLamPortlet</portlet-name>
  <portlet-class>xqx.web.xlam.XLamPortlet</portlet-class>
  <supports>
      <mime-type>text/html</mime-type>
      <portlet-mode>VIEW</portlet-mode>
      <portlet-mode>EDIT</portlet-mode>
      <portlet-mode>HELP</portlet-mode>
  </supports>
  <portlet-info>
      <title>XLam Portlet</title>
  </portlet-info>
</portlet>
</portlet-app>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
   xmlns="http://java.sun.com/xml/ns/j2ee"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

<servlet>
  <servlet-name>XLamService</servlet-name>
  <servlet-class>
      xqx.web.xlam.server.XLamServiceImpl
  </servlet-class>
</servlet>

<servlet-mapping>
  <servlet-name>XLamService</servlet-name>
  <url-pattern>/XLamService</url-pattern>
</servlet-mapping>

</web-app>

xlam-object.xml

<?xml version="1.0" encoding="UTF-8"?>
<deployments>
<deployment>
  <if-exists>overwrite</if-exists>
  <parent-ref>default</parent-ref>
  <page>
      <page-name>XLam</page-name>
      <window>
          <window-name>XLamPortletWindow</window-name>
          <instance-ref>XLamPortletInstance</instance-ref>
          <region>left</region>
          <height>0</height>
      </window>
  </page>
</deployment>
</deployments>

XLamService.java

package xqx.web.xlam.client.rpc;

import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.rpc.RemoteService;
import com.google.gwt.user.client.rpc.ServiceDefTarget;
import xqx.web.xlam.client.Time;

public interface XLamService extends RemoteService {

Time getTime();

public static class App {
private static xqx.web.xlam.client.rpc.XLamServiceAsync ourInstance = null;

public static synchronized xqx.web.xlam.client.rpc.XLamServiceAsync getInstance() {
if (ourInstance == null) {
ourInstance = (xqx.web.xlam.client.rpc.XLamServiceAsync) GWT.create(XLamService.class);
((ServiceDefTarget) ourInstance).setServiceEntryPoint(GWT.getModuleBaseURL() + "XLamService");
}
return ourInstance;
}
}
}

XLamServiceAsync.java

package xqx.web.xlam.client.rpc;

import com.google.gwt.user.client.rpc.AsyncCallback;

public interface XLamServiceAsync
{
void getTime(AsyncCallback callback);
}


Time.java

package xqx.web.xlam.client;

import com.google.gwt.user.client.rpc.IsSerializable;

public class Time implements IsSerializable
{
private String time;

public String getTime() { return time; }

public Time(String message) { this.time = message; }

public Time() { }
}

XLam.java

package xqx.web.xlam.client;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootPanel;
import xqx.web.xlam.client.rpc.XLamService;

public class XLam implements EntryPoint
{
private Timer timer;
private Label label = new Label("Wait...");

private class CallBack implements AsyncCallback
{
  public void onFailure(Throwable caught)
  {
      timer.cancel();
      Window.alert(caught.getMessage());
  }

  public void onSuccess(Object result)
  {
      label.setText(((Time) result).getTime());
  }
}

private CallBack callBack = new CallBack();

public void onModuleLoad()
{
  RootPanel.get("uid").add(label);

  timer = new Timer()
  {
      public void run()
      {
          XLamService.App.getInstance().getTime(callBack);
      }
  };
  timer.scheduleRepeating(1000);
}
}                           

XLam.html (dummy)

<html>
<head>
<title>XLam</title>
</head>
<body>
<script language='javascript' src='xqx.web.xlam.XLam.nocache.js'></script>
<div id='uid'></div>
</body>
</html>

XLamServiceImpl.java

package xqx.web.xlam.server;

import com.google.gwt.user.server.rpc.RemoteServiceServlet;
import xqx.web.xlam.client.Time;
import xqx.web.xlam.client.rpc.XLamService;

import java.text.DateFormat;
import java.util.Date;

public class XLamServiceImpl extends RemoteServiceServlet implements XLamService
{
public Time getTime()
{
  String out = DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.FULL).format(new Date());
  return new Time(out);
}
}

XLamPortlet.java

package xqx.web.xlam;

import javax.portlet.GenericPortlet;
import javax.portlet.PortletException;
import javax.portlet.PortletSecurityException;
import javax.portlet.RenderRequest;
import javax.portlet.RenderResponse;
import java.io.IOException;
import java.io.PrintWriter;

public class XLamPortlet extends GenericPortlet
{
protected void doView(RenderRequest renderRequest, RenderResponse renderResponse) throws PortletException, PortletSecurityException, IOException
{
  renderResponse.setContentType("text/html");
  PrintWriter writer = renderResponse.getWriter();
  writer.println("<script language='javascript' src='" + renderRequest.getContextPath() + "/xqx.web.xlam.XLam.nocache.js'></script>");
  writer.println("GWT time:");
  writer.println("<div id='uid'></div>");
  writer.close();
}

protected void doHelp(RenderRequest renderRequest, RenderResponse renderResponse) throws PortletException, PortletSecurityException, IOException
{
  renderResponse.setContentType("text/html");
  PrintWriter writer = renderResponse.getWriter();
  writer.write("Help");
  writer.close();
}

protected void doEdit(RenderRequest renderRequest, RenderResponse renderResponse) throws PortletException, PortletSecurityException, IOException
{
  renderResponse.setContentType("text/html");
  PrintWriter writer = renderResponse.getWriter();
  writer.println("Edit");
  writer.close();
}
}

XLam.gwt.xml

<module>
<inherits name='com.google.gwt.user.User'/>
<entry-point class='xqx.web.xlam.client.XLam'/>
<servlet path="/XLamService" class="xqx.web.xlam.server.XLamServiceImpl"/>
</module>

Build, deploy and view (http://localhost:8080/portal/auth/portal/default/XLam)

For building purpose you may use this Ant file:


build.xml

<?xml version="1.0" encoding="ISO-8859-1"?>

<project name="xlam" default="war">

<property file="local.properties"/>
<property file="build.properties"/>

<property name="build" value="build"/>

<property name="jarfile" value="${project.name}.jar"/>
<property name="warfile" value="${project.name}.war"/>

<path id="classpath">
  <fileset dir="${jbossportal.lib}" includes="**/*.jar"/>
  <fileset dir="${gwt.home}" includes="**/*.jar"/>
  <fileset file="${jarfile}"/>
  <pathelement location="src"/>
</path>

<target name="clean">
  <delete dir="${build}"/>
</target>

<target name="jar" depends="clean">
  <mkdir dir="${build}/bin"/>
  <javac srcdir="src" destdir="${build}/bin" classpathref="classpath" debug="true"/>
  <jar basedir="${build}/bin" jarfile="${build}/${jarfile}"/>
</target>

<target name="war" depends="jar, gwt">
  <copy todir="${build}/war">
      <fileset dir="${build}/www/${project.package}.${project.name}">
          <exclude name="**/*cache.xml"/>
          <exclude name="**/history.html"/>
      </fileset>
  </copy>

  <copy todir="${build}/war/WEB-INF">
      <fileset dir="src/WEB-INF"/>
  </copy>

  <copy todir="${build}/war/WEB-INF/lib">
      <fileset file="${build}/${jarfile}"/>
      <fileset file="${gwt.home}/gwt-servlet.jar"/>
  </copy>

  <jar basedir="${build}/war" jarfile="${build}/${warfile}"/>
</target>

<target name="gwt">
  <mkdir dir="${build}/www"/>
  <java classname="com.google.gwt.dev.GWTCompiler" fork="true" dir="${build}" classpathref="classpath">
      <arg line="-out www ${project.package}.${project.name}"/>
  </java>
</target>

<target name="shell" depends="jar">
  <delete dir="${build}/www"/>
  <mkdir dir="${build}/www"/>
  <java classname="com.google.gwt.dev.GWTShell" fork="true" dir="${build}" classpathref="classpath">
      <arg line="-out www ${project.package}.${project.name}/${project.name}.html"/>
  </java>
</target>

<target name="undeploy">
  <delete file="${jbossportal.node}/deploy/${warfile}"/>
</target>

<target name="deploy" depends="undeploy, war">
  <copy file="${build}/${warfile}" todir="${jbossportal.node}/deploy"/>
</target>
</project>

build.properties

project.name=XLam
project.package=xqx.web.xlam
project.sources=xqx/web/xlam

local.properties (* You should replace paths with your real data)

jdk.home=E:/devenv/tools/jdk-1.5.0_04

jbossportal.home=E:/devenv/tools/jboss-portal-2.6
jbossportal.node=${jbossportal.home}/server/default
jbossportal.lib=${jbossportal.node}/deploy/jboss-portal.sar/lib

gwt.home=E:/devenv/tools/gwt-windows-1.4.10
gwt.docs.index=${gwt.home}/doc/html/gwt.html

You may download these sources from Xantorohara.blogspot.com samples