Kasun's Tech Thoughts

Siddhi: A Second Look at Complex Event Processing Architectures

2011-11-25T16:00:00.026+05:30

The paper titled "Siddhi: A Second Look at Complex Event Processing Architectures" has been presented in Proceedings of the Gateway Computing Environments Workshop (GCE) at Supercomputing 2011 in Seattle, WA, USA. Siddhi was a final year project of '07 batch of University of Moratuwa by a group comprising of Suho, Isuru, Subash, and me. Dr. Srinath Perera, and Ms. Vishaka Nanayakkara supervised

Gentoo Maven Integration - Progress Report

2011-10-20T11:09:00.007+05:30

Here's my progress report for the first phase of Gentoo Maven Integration project for finishing the work under Google Summer of Code and starting move in to a voluntary position. The goal of this project was to build maven and it's huge number of dependencies from source, and then facilitate the packagers for packaging maven-based Java packages. There are two eclasses which will facilitate

Siddhi CEP has won a bronze award at NBQSA 2011

2011-10-09T17:30:00.002+05:30

Siddhi Complex Event Processing Engine has won the bronze award in Tertiary category at the recently concluded National Best Quality Software Awards 2011 held in Hotel Galadari, Colombo, Sri Lanka. The winners are now published at NBQSA official website. Further, Siddhi has been nominated to APICTA (Asia Pacific ICT Awards) 2011 which will be held during November 8 – 11, 2011 in

TagSoup - Parse even the worst HTML as XML

2011-10-09T12:59:00.007+05:30

If you are in ever in need of parsing XML to retrieve some contents from a HTML file, you know how irritating it is. Generally, HTML is supposed to contain a well-formed XML. But it's quite often far from it most of the time. HTML files contain mismatched tags, missing end-tags etc. So, if you parse these HTML files with a popular Java XML Parser like Xerces, it will throw an exception, and will

How to run Java applets in Google Chrome under Ubuntu

2011-03-13T16:51:00.012+05:30

I found that Google Chrome doesn't auto-detect Java applets in Linux. Following commands will link the Java applet plugin to Chrome. Enter these in Terminal. Make sure you put the correct path for the JRE in /usr/lib/jvm/<jdk1.6.0_22>/jre/lib/i386/libnpjp2.so. sudo mkdir /opt/google/chrome/pluginscd /opt/google/chrome/plugins Now, link the plugin libnpjp2 to /opt/google/chrome/plugins

ගූගල් සමර් ඔෆ් කෝඩ් 2011 සදහා ශ්‍රී ලංකාවේ ප්‍රවර්ධන සැසි සහ අත් පත්‍රිකා

2011-02-21T15:33:00.009+05:30

ඔන්න හා හා පුරා කියල සිංහලෙනුත් බ්ලොග් පෝස්ට් එකක් දාන්නයි මේ ලැහැස්තිය :) මුලින්ම දාන්න යන්නේ නම් ගූගල් සමර් ඔෆ් කෝඩ් (GSoC) 2011 වෙනුවෙන් හදපු සිංහල අත් පත්‍රිකාව ගැනයි. මේ දවස් වල GSoC උණුසුම හුඟක් අයට දැනිල ඉවරනේ... දැන් අපේ කට්ටිය බරටම FOSS මෘදුකාංග තෝරාගෙන ඒවාට දායක වෙන්න (contribute) පටන් අරන්. අපේ කැම්පස් එක පහු ගිය අවුරුදු වල GSoC වලින් අංක එකේ හිටපු හින්ද [1] [2] ලොකු උනන්දුවක්

Comic: Public Key Cryptography in a fairy tale!

2010-12-22T10:00:00.001+05:30

The comic shown above shows a PKC scenario of a commonly known fairly tale "The Frog Prince". This was done by a group of ten people including me. Try and see whether you can understand it!! :) (click on the image to see it in original size (obviously)!) HINT: This involves a Witch, a princess, and a frog (prince), and this shows the encryption scheme of PKC. This comic was done as a

How to Use docbkx-tools as Maven DocBook plugin

2010-12-12T00:15:00.006+05:30

When it comes to documentation of open source projects, DocBook is the favorite choice among many developers. As you all know, DocBook provides a comprehensive XML schema to document your project, which you can transform to any format such as html, pdf, webhelp etc. Here, I'm going to show you how to integrate DocBook in to your Maven project via docbkx-tools. This docbkx-maven-plugin makes

Heard of 2D bar codes? It's awesome!

2010-12-09T22:34:00.004+05:30

QR code for the URL http://blog.kasunbg.org While crawling through web, I found this awesome technique called QR codes. It is short for "Quick Response Code", a 2D bar code system, which first introduced in Japan way back in time (1994 precisely, says wikipedia :) ). These codes could be the future, where every magazines and papers carry out these to give some important details or the URL of

Français: Vote JavaScript pour la langue française

2010-10-12T13:06:00.001+05:30

Ceci est la version (google) traduit de l'anglais blog-post "Stemmer JavaScript pour la langue française". Je demande pardon s'il ya des erreurs présentes dans la version traduite. Il ya un mois, j'ai écrit un port JavaScript pour l'algorithme de Porter français Issu dans le web-site Snowball. Algorithme a été assez claire de sorte que le codage a été juste une journée de travail:) Je n'ai ce

JavaScript Stemmer for French Language

2010-10-08T19:08:00.001+05:30

About a month ago, I wrote a JavaScript port for the Porter French Stemming Algorithm in Snowball. Algorithm was pretty clear so, that was just a day of work :) I did this port for a requirement of the Google Summer of Code DocBook Webhelp Project which I worked on in the last few months. If you are not familiar with what a Stemmer is, here's a brief introduction :). What a Stemmer basically

DocBook Version 5.1b2 and DocBook-XSL Version 1.76.0 released

2010-08-28T14:29:00.000+05:30

On 27th August 2010 DocBook version 5.1b2 and DocBook-XSL version 1.76.0 was released. DocBook V5.1b2 is the second test release of DocBook V5.1. Version 5.1b2 is available in RELAX NG and non-normatively in DTD and W3C XML Schema formats. Summary of Changes in DocBook V5.1 The largest change is the introduction of support for topic-based authoring through the addition of the topic element and

DocBook WebHelp Project

2010-08-21T22:37:00.003+05:30

DocBook WebHelp was the project I worked on for the Google Summer of Code 2010 program. Pencil down date for it was on 16th August, 2010, which means the Coding officially finished on that day. So, I with my mentor David Cramer finished all the requirements planned, and wrote all the documentation needed. Results was announced today, 21st August by Google Open Source Program team; I

Colombo Ride 3D

2010-07-04T14:53:00.000+05:30

Following is the trailer of Colombo Ride 3D, a Sri Lankan 3D mobile game developed by Gamos Technology Solutions (GTS). This will bring a new world of experience to Sri Lankan mobile game lovers. Further details can be found at http://games.lk/

Install/Update Mozilla Firefox 3.6.6

2010-07-02T18:54:00.000+05:30

Mozilla launched a new update for Mozilla Firefox. This new release is a update for crash protection feature, which was first introduced in Mozilla Firefox 3.6.4. Mozilla blog says the crash protection feature, "protects Windows and Linux users from crashes and freezes caused by third party plugins such as Flash and Silverlight. When a plugin crashes, users can reload the Web page to restart

Wordle word clouds

2010-06-27T14:00:00.000+05:30

Here are some word clouds I created using Wordle. Wordle is a service which generates a cloud with a given text. It gives greater prominence for words appearing frequently, making those words to appear bigger. Following clouds were created using the content in this blog. Try it: http://www.wordle.net/

Test Post from GoogleCommandLine: GoogleCL

2010-06-24T18:25:00.001+05:30

Hello, I'm posting this from Ubuntu 10.04 terminal using the GoogleCL tool. It's awesomeeee...... :D Should learn the full api and command line arguments. This is just a test post to check how it works. Command I'm using is: 'google blogger post --tags tagsInQuotes,GoogleCL,goole --title TitleInQuotes TheBodyContent. Added p html tag just to check how it would look like! You can download GoogleCL

Remote Debugging Java packages in WSO2 Carbon using IntelliJ IDEA

2010-05-26T13:18:00.001+05:30

Here I'm going to tell you an easy way of debugging java packages deployed under any WSO2 product. So, you don't need to go wondering and go through thousands of lines looking what the bug was in your package. What you need: IntelliJ IDEA Download the latest version from http://www.jetbrains.com/idea/download/index.html#linux Installation instructions can be found here. The WSO2 Product

Remote Desktop for Linux Using VNC

2010-05-18T22:01:00.000+05:30

Here, I'm telling you a easy way to do remote desktop from Linux. You can access Linux machine through another machine with Linux Distribution or from Microsoft Windows as well. The method used for this is VNC (Virtual Network Computing). Before, trying anything, you need to know this. The machine that you use to access a Remote machine is called the client. And the Remote Desktop is the server.

Fix for 'Ubuntu Lucid Touchpad not working'

2010-05-15T18:30:00.017+05:30

Ubuntu 10.04 is intended as a Long Term Support (LTS) release, but surely it's not less of bugs. Touchpad stopped working when disable button is pressed, is surely one major bug of Lucid by usability wise. My friend Subash and I both faced this problem when we install Lucid. We both have HP Pavillion Series Laptops. In theory, this should work on any laptop/touchpad. Based on user comments,

Fixing the error in installing Maven plugin in Netbeans 6.8

2010-05-12T18:48:00.000+05:30

I yesterday installed Ubuntu family newest OS release Ubuntu Lucid Lynx (Ubuntu 10.04) and then gone through the step of installing softwares. (Tried upgrade option of Ubuntu from Karmic Koala, but got screwed up! anyway it's another story.) Ubuntu Lucid comes with Netbeans version 6.8. But there's a bug in it which prevents users from installing Maven plugin in it. It gives an error saying,

Google Summer of Code 2010

2010-04-28T23:30:00.000+05:30

Finally this year’s Google Summer of Code (GSoC) 2010 students are announced. I am Glad to announce, I am one of them. :-) I chose DocBook as my organization. DocBook provides a set of standards and tools for technical documentation. It was initially and is primarily intended for technical documentation, but has been extended for use in other domains as well. The proposal I submitted "Web Help

Proposal "Web Help Output for DocBook" for GSoC 2010

2010-04-28T22:24:00.002+05:30

UPDATE: DocBook WebHelp XSL Customization is now integrated DocBook XSL release starting from version 1.76.0. The release is available for download at http://docbook.sourceforge.net/snapshots/. Release notes are at DocBook WebHelp Project (22/10/2010) UPDATE: Google Summer of Code 2010 program finished on 20th August. See DocBook WebHelp Project for the end notes, features and to view the

Send Ajax Requests from JavaScript easily with Prototype framework

2010-04-17T19:57:00.001+05:30

Did you have a need of setting up an JSP Java variable in a JSP file inside a JavaScript code. Generally, this is not possible as JavaScript works on client-side and JSP Java compilation happens server-side. i.e. When a user request a JSP file, first, the Java codes in it is compiled and generates pure HTML (and JavaScript) code. So, if you want to set a Java variable or any other thing involving

Show/Hide HTML div tags using JavaScript

2010-04-16T15:31:00.000+05:30

I'm here giving a simple way to show or hide a given content in a HTML file using JavaScript dynamically. Here, I'm showing a way to hide a text by click of a button. When clicked first, it will hide the content and clicking again will show it. The code is this: <script type="text/javascript"> function showHide(divId){ var theDiv = document.getElementById(divId); if(theDiv.style.display=