tag:blogger.com,1999:blog-5034237350667380624Sat, 04 Apr 2026 11:33:20 +0000carbonESBJavaOSGiLinuxArchitectureCarbon 4.0IdentityOperating SystemsTomcatYouTubetutorialsubuntu 9.04webinarwso2AuthorizationAxis2BISSABlowing in the WindBoFBrokerC/C++CompileDebianDeployment SynchronizerEIPEclipseFusesourceGCE10GDBIEIEEEJKSJMXJava ColomboJohnnyKernelMPIMQTTMessage BrokerNIOOSGi consoleOpenAMOpenOfficeOpenSSOP2PKCPaxPresentationPubSubRESTRaspberry-piSAML2SC10SSOUNIXUbuntuWSO2 CarbonWSO2ConWeb-appsXACMLack-grepcartooncricketdriversequinoxflv to mp3funnygitgnuplotjremavenmemorymicro-architecturenotesopenjdkpatternsperformanceproBook 4410sprofilingreactor patternsecurityserver architecturetoolsvimweb serviceswhite-boardwindows XPxmlPradeep Fernando's blog spacehttp://pradeepfernando.blogspot.com/noreply@blogger.com (pradeep fernando)Blogger42125tag:blogger.com,1999:blog-5034237350667380624.post-4745398929176487847Fri, 02 Dec 2016 17:40:00 +00002016-12-02T23:10:09.688+05:30 Below is a reading list that i find interesting. Working with native memory in managed languages. - https://dzone.com/articles/understanding-sunmiscunsafe http://pradeepfernando.blogspot.com/2016/12/articles-worth-reading.htmlnoreply@blogger.com (pradeep fernando)0tag:blogger.com,1999:blog-5034237350667380624.post-8839474973986878934Fri, 04 Sep 2015 17:12:00 +00002016-01-07T23:30:31.218+05:30GDBMPI Basic GDB 'sayHello' being the program binary > gdb sayHello > b 10  - set the breakpoint at line 10 > run   - run the program under debugger > print 'variable_name'  - print the variable name Ctrl+x , a    will enable the gui based debugging in the gdb. MPI debugging, running a program under gdb > mpiexec -n 4 xterm -e gdb ./gtc this will http://pradeepfernando.blogspot.com/2015/09/command-line-debug.htmlnoreply@blogger.com (pradeep fernando)0tag:blogger.com,1999:blog-5034237350667380624.post-8776972973798212485Mon, 04 May 2015 23:20:00 +00002015-05-05T04:50:43.038+05:30CompileKernelLinuxOperating SystemsUbuntu Canonical provides Ubuntu flavors of mainline kernel. However I wanted to install the latest kernel, straight from the Linus's git repo . :)I used a virtual machine environment to compile and install the kernel. We can install the followingsoftware packages using Ubuntu's package manager (apt). - Qemu - virtualization platform- Virt-manager - GUI for qemuI used 14.04 Ubuntu distribution - http://pradeepfernando.blogspot.com/2015/05/compilinginstalling-mainline-linux.htmlnoreply@blogger.com (pradeep fernando)2United States35.173808317999587 -83.6718750000000578.727644817999586 -124.98046900000006 61.619971817999584 -42.363281000000057tag:blogger.com,1999:blog-5034237350667380624.post-6992757575321059195Sun, 03 May 2015 18:59:00 +00002015-05-04T00:31:52.323+05:30micro-architectureOperating Systems It follows a tick-tock naming convention. Tock - New micro-architecture while keeping the process technology the same. Tick  - Improving on the previous micro-architecture using process technology. (45nm etc.) Nehalem (tock)         45nm Westmere (tick)        32nm Sandy Bridge (tock)  32 nm Ivy Bridge (tick)        22 nm http://pradeepfernando.blogspot.com/2015/05/intel-processor-micro-architecture-code.htmlnoreply@blogger.com (pradeep fernando)0tag:blogger.com,1999:blog-5034237350667380624.post-9216872354703904044Tue, 16 Jul 2013 10:37:00 +00002013-07-16T20:16:49.584+05:30carbonwebinar I am going to conduct a webinar on the $title. In this webinar we are going to cover the possible usages of the extension points provided by Carbon platform. Carbon is a very powerful middle-ware platform as it is... , however it provides enough flexibility to the developer if he/she wants to alter the default behavior. Carbon Runtime View - diagram by sameeraJayasoma. http://pradeepfernando.blogspot.com/2013/07/webinar-extending-wso2-carbon-for-your.htmlnoreply@blogger.com (pradeep fernando)1tag:blogger.com,1999:blog-5034237350667380624.post-3083564650073789849Sat, 29 Jun 2013 09:23:00 +00002013-06-29T15:04:25.262+05:30IdentityJKSOpenAMOpenSSOSAML2SSO WSO2 Carbon products comes with in-built web-SSO authenticators. Within minutes, you can enable web-SSO for any WSO2 Carbon server using WSO2 Identity Server as the IDP. In this blog post we are using, OpenSSO/OpenAM as the IDP and do the configuration. Pre-requisites 1. Download and install openAM/openSSO [download the war file from here] 2. Download the WSO2 product. Setting up the http://pradeepfernando.blogspot.com/2013/06/enabling-saml2-sso-for-wso2-carbon.htmlnoreply@blogger.com (pradeep fernando)0tag:blogger.com,1999:blog-5034237350667380624.post-2864251775240776317Fri, 26 Apr 2013 07:40:00 +00002013-04-26T13:10:32.650+05:30ArchitectureEclipseOSGiP2WSO2 Carbon WSO2 Carbon is an OSGi based server framework. Number of WSO2 middleware products use Carbon as their base platform. Carbon make use of Eclipse Equinox as its OSGi framework implementation and use Eclipse P2 as its provisioning framework. Problem Description Some of the Carbon products has their own deployment patterns during actual production deployments. However to give a smooth evaluationhttp://pradeepfernando.blogspot.com/2013/04/multiple-profiles-and-shared-bundles.htmlnoreply@blogger.com (pradeep fernando)0tag:blogger.com,1999:blog-5034237350667380624.post-7760763210591068895Mon, 15 Apr 2013 04:13:00 +00002013-04-15T09:46:42.721+05:30BrokerESBMQTTPubSub MQTT is an application layer broker based pub/sub protocol built on top of TCP/IP. It is very lightweight and hence ideal for usage in network/memory/computing power constrained environments. If I quote the MQTT spec, the protocol features, Pub/Sub message pattern Small transport overhead, fixed length header being only 2 bytes Supports three QOS for message delivery, at-least once, http://pradeepfernando.blogspot.com/2013/04/mqtt-transport-for-axis2synapse.htmlnoreply@blogger.com (pradeep fernando)0tag:blogger.com,1999:blog-5034237350667380624.post-1914843798766804884Thu, 11 Apr 2013 12:06:00 +00002013-04-11T17:36:00.151+05:30EIPESBMessage Broker Recently I came across the following requirement, An organization has a message delivery network and an application that makes use of those messages (process them). The delivery network directly communicates with the message processing application. Things seems to be working fine on a regular day. However if the load(incurred by the delivery network) is high, some of the messages may get http://pradeepfernando.blogspot.com/2013/04/dealing-with-occasional-message-bursts.htmlnoreply@blogger.com (pradeep fernando)0tag:blogger.com,1999:blog-5034237350667380624.post-1867587339193898039Thu, 11 Apr 2013 07:46:00 +00002013-04-11T13:16:33.513+05:30Javamemoryperformanceprofiling Inspired by the experiences gathered during recent application profiling sessions at WSO2, we did a webinar on memory and performance tuning. Below are the slides. Application Profiling for Memory and Performance from pradeepfn http://pradeepfernando.blogspot.com/2013/04/application-profiling-for-memory-and.htmlnoreply@blogger.com (pradeep fernando)0tag:blogger.com,1999:blog-5034237350667380624.post-6010551238762542790Tue, 26 Feb 2013 12:06:00 +00002013-04-11T13:17:19.804+05:30JavaNIOreactor patternserver architecture Why this blog post? Recently I was working with a team to improve the mediation performance of Apache Synapse ESB. Java NIO was new to me when i took up the challenge. I spent few days learning I/O concepts and NIO particularly. Soon after my background reading period, I was pulled out to optimize Carbon kernel. Tough luck!. Then again I learnt few things and thought of compiling a blog post http://pradeepfernando.blogspot.com/2013/02/understanding-java-nio-my-notes.htmlnoreply@blogger.com (pradeep fernando)0tag:blogger.com,1999:blog-5034237350667380624.post-3991208179764194221Thu, 14 Feb 2013 09:53:00 +00002013-02-14T15:25:00.139+05:30AuthorizationESBFusesourceIdentityXACML Authorization - The bad way In a typical organization that makes use of Service Oriented Architecture (fully/partially) to drive their IT requirements, chances are more to find tens/hundreds of services scattered across departments. If the legacy services are works fine for the organization, changing them is not a wise decision. However one always has to consider the maintainability&http://pradeepfernando.blogspot.com/2013/02/fine-grained-xacml-based-authorization.htmlnoreply@blogger.com (pradeep fernando)1tag:blogger.com,1999:blog-5034237350667380624.post-3194292131358417429Sun, 10 Feb 2013 10:59:00 +00002013-02-10T16:33:03.211+05:30OSGipatternsPaxwhite-board A common solution for a recurring problem can be named as a pattern. Patterns are everywhere. More often than not, we adopt patterns for computer science from our day to day life experiences. White board pattern is one such common pattern. The pattern allows you to decouple two parties from each other (consumer/provider). I came across this pattern for the first time during my final year http://pradeepfernando.blogspot.com/2013/02/patterns-in-osgi-programming-white.htmlnoreply@blogger.com (pradeep fernando)4tag:blogger.com,1999:blog-5034237350667380624.post-7934451694494214581Thu, 07 Feb 2013 02:23:00 +00002013-02-07T07:53:18.485+05:30BoFcarbonWSO2Con WSO2 has organized a Birds of a Feather(BoF) session targeting next major efforts on WSO2 Carbon platform. We all can discuss/brainstorm/etc and decide on the future of Carbon Server Framework. The session will be held in London Conference premises and I am going to lead the session. Agenda can be found here http://pradeepfernando.blogspot.com/2013/02/bof-session-on-carbon-at-wso2con-2013.htmlnoreply@blogger.com (pradeep fernando)0tag:blogger.com,1999:blog-5034237350667380624.post-4858251682572101680Sun, 03 Feb 2013 16:56:00 +00002013-02-03T22:27:53.304+05:30Java ColomboOSGiPresentation Java Colombo is the largest Java developer group in Sri Lanka. Recently, we (me and my collegue Sameera) did a introductory session on OSGi during one of their meetups. It was very well received. Below are the presentation slides we used during the meetup. Me presenting at the meetup. :) The photo credit for below photo goes to Isuru Perera. http://pradeepfernando.blogspot.com/2013/02/demystifying-osgi-java-colombo-meetup.htmlnoreply@blogger.com (pradeep fernando)0tag:blogger.com,1999:blog-5034237350667380624.post-6838890305426750962Thu, 10 Jan 2013 08:56:00 +00002013-01-10T14:26:54.009+05:30DebianRaspberry-pi Raspberry-pi is a general purpose computer, that comes in the size of a credit card. The type B has 512 MB of memory and it comes with a ARM processor. It also has general purpose I/O (GPIO) which enables you to drive external I/O interfaces by means of programming. This getting started notes are for my own reference.  Download the OS image for Raspberry-pi http://pradeepfernando.blogspot.com/2013/01/raspberry-pi-my-notes.htmlnoreply@blogger.com (pradeep fernando)1tag:blogger.com,1999:blog-5034237350667380624.post-6434637127551828831Sat, 24 Nov 2012 13:52:00 +00002012-11-25T18:23:49.851+05:30carbonJMX Recently we were doing some load testing against Carbon servers. Soon we realized that there was no easy way to get average memory usage and CPU utilization. (apart from taking jconsole screenshots). End of the day we automated the whole testing process. Below is the JMX client [1] that we used to get details out from the remote running Carbon Server. It dumps the details to a CSV file. Later http://pradeepfernando.blogspot.com/2012/11/jmx-client-to-monitor-carbon-servers.htmlnoreply@blogger.com (pradeep fernando)1tag:blogger.com,1999:blog-5034237350667380624.post-7783907028005260076Fri, 09 Nov 2012 10:10:00 +00002012-11-09T15:40:31.640+05:30carbonDeployment Synchronizerwebinar Recently I did a webinar on the topic of "Deployment Sysnchronizer" : the sync-up mechanism we use to synchronize artifacts and meta data in our Carbon product clusters. WSO2 Dep Sync for Artifact Synchronization of Cluster Nodes from WSO2 http://pradeepfernando.blogspot.com/2012/11/webinar-artifact-synchronization.htmlnoreply@blogger.com (pradeep fernando)0tag:blogger.com,1999:blog-5034237350667380624.post-1845212933513003362Sun, 16 Sep 2012 03:28:00 +00002012-09-16T08:58:47.166+05:30Carbon 4.0TomcatWeb-apps As I have explained in one of my previous posts, WSO2 Carbon has undergone some major architectural changes from its 3.x.x version to version 4. One of our main goals during those changes was to make Carbon running in a pure-OSGi container instead of running it in a bridged mode. At some point we were considering to drop off the web-app mode deployment, altogether from the C4 release http://pradeepfernando.blogspot.com/2012/09/running-wso2-carbon-as-web-app-apache.htmlnoreply@blogger.com (pradeep fernando)6tag:blogger.com,1999:blog-5034237350667380624.post-3000987120488338497Sat, 11 Aug 2012 05:26:00 +00002012-08-11T10:56:50.078+05:30ArchitecturecarbonCarbon 4.0OSGiTomcat With the 4.0 release of WSO2 Carbon  we have changed the internal architecture of the platform in a significant way. In the pre Carbon 4 era, WSO2 carbon used to get deployed as a web-app on apache-tomcat servlet container under the hood. The hight level architecture looked like,  As shown in the above diagram Carbon framework get deployed as just another web-app in Apache tomcathttp://pradeepfernando.blogspot.com/2012/08/wso2-carbon-40-architecture-my-notes.htmlnoreply@blogger.com (pradeep fernando)0Panadura, Sri Lanka6.717595 79.91282696.4653170000000006 79.5969699 6.969873 80.2286839tag:blogger.com,1999:blog-5034237350667380624.post-5464439182449421356Thu, 06 Oct 2011 18:28:00 +00002012-08-11T15:46:59.971+05:30equinoxOSGi console This blog post is mainly targeted at the WSO2 Carbon developers who make use of OSGi console to debug their bundles/components during the runtime. I'm here assuming that you have the basic shell which you would find in equinox environment. You can start any of the WSO2 server products (that is based on Carbon) with OSGi console enabled, by passing the system property 'osgiConsole' during http://pradeepfernando.blogspot.com/2011/10/debugging-your-osgi-application-using.htmlnoreply@blogger.com (pradeep fernando)8tag:blogger.com,1999:blog-5034237350667380624.post-9122603509673411613Wed, 17 Aug 2011 05:03:00 +00002011-08-17T10:34:45.697+05:30gitnotes git checkout  'file-name' just a small notehttp://pradeepfernando.blogspot.com/2011/08/revert-not-commited-local-changes-of.htmlnoreply@blogger.com (pradeep fernando)0tag:blogger.com,1999:blog-5034237350667380624.post-3494419133676278049Mon, 30 May 2011 09:29:00 +00002011-05-30T14:59:11.309+05:30ESBRESTwso2This is more of a small note in case I forget what i did while trying things out. First of all I created a ESB proxy for a back-end service that accepts post request and does some manipulation on the received request. Once you create a ESB proxy by giving the above REST service as the service endpoint , the InSequence element of the proxy.xml will look like this. <inSequence>   http://pradeepfernando.blogspot.com/2011/05/post-variables-get-dropped-while-going.htmlnoreply@blogger.com (pradeep fernando)1tag:blogger.com,1999:blog-5034237350667380624.post-1089470872630538709Fri, 15 Apr 2011 11:23:00 +00002011-04-15T17:07:39.506+05:30vimxmlRecently I wanted to delete a certain search pattern in an XML file. Within the XML file I had a XML snippet; and i wanted to delete the commented out part. I was able to do it with this, search replace command in vim. :%s/<!--moved to nexus\_.\{-}--> I got this to working by looking at the mail[1] [1] http://osdir.com/ml/editors.vim/2002-06/msg00468.html its a http://pradeepfernando.blogspot.com/2011/04/delete-set-of-elements-in-xml-file.htmlnoreply@blogger.com (pradeep fernando)0tag:blogger.com,1999:blog-5034237350667380624.post-8329675244188685515Sun, 05 Dec 2010 16:26:00 +00002013-04-11T12:42:48.830+05:30gnuplotIEEEUNIX I was writing our first IEEE grade paper few days back. It was first written using MS word as my text editor. Now that it got selected to be published on the IEEE explore, we thought of preparing a latex based paper for final publication. One of the major proplem was the image quality of some of the figures. I tackled that using the popular open source vector grphics editor - > Inkscape. http://pradeepfernando.blogspot.com/2010/12/plotting-graphs-for-scientific-papers.htmlnoreply@blogger.com (pradeep fernando)0