Enterprise Integration for Beginners

If you have ever used WSO2 ESB, you might already know that it is one of the highest performing open source ESB solutions in the integration space. The secret behind it’s performance is the so-called Pass Through Transport (PTT) implementation which handles the HTTP requests. If you are interested in learning about PTT from scratch, you can refer the fololwing article series written by Kasun Indrasiri. Demystifying WSO2 ESB Pass-Through Transport - Part I Demystifying WSO2 ESB Pass-Through Transport - Part II Demystifying WSO2 ESB Pass-Through Transport - Part III If you read through the above mentioned posts, you can get a good understanding about the concepts and the implementation. But one thing which is harder to do is remember all the diagrams in your memory. It is not impossible, but little bit harder for a person with average brain. I have tried to draw a picture to capture all the required information related to the PTT. Here is my drawing on WSO2 ESB PTT. ...

In the previous blog post [1], I have discussed about the PassThrough Transport and how it works. If you follow this [2] article, you can learn about what is happening inside PTT when a message is received. The below diagram depicts the relationship of PTT, Axis2 and Synaps Mediation engine within WSO2 ESB. [1]  http://soatutorials.blogspot.com/2015/05/understanding-wso2-esb-pass-through.html [2]  http://wso2.com/library/articles/2013/12/demystifying-wso2-esb-pass-through-transport-part-iii/ As depicted in the above diagram, When a message comes to the ESB, it will be received by the reactor thread of Pass Through Listener and the message will be read in to an internal buffer. Then it will be processed through a separate worker thread and will flows through the Axis2 In message flow. Then Axis2 engine will call the respective message receiver (SynapseMessageReceiver, ProxyMessageReceiver or SynapseCallbackReceiver) class. This would be the main entry poi...

WSO2 ESB is an asynchronous high performing messaging engine which uses Java NIO technology for its internal implementations. You can find more information about the implementation details about the WSO2 ESB’s high performing http transport known as Pass-Through Transport (PTT) from the links given below. [1] http://soatutorials.blogspot.com/2015/05/understanding-wso2-esb-pass-through.html [2] http://wso2.com/library/articles/2013/12/demystifying-wso2-esb-pass-through-transport-part-i/ From this tutorial, I am going to discuss about various threads created when you start the ESB and start processing requests with that. This would help you to troubleshoot critical ESB server issues with the usage of a thread dump. You can monitor the threads created by using a monitoring tool like Jconsole or java mission control (java 1.7.40 upwards). Given below is a list of important threads and their stack traces from an active ESB server.  PassThroughHTTPSSender ( 1 Thread ...

WSO2 ESB is arguably the highest performing open source ESB available in the industry. It has been tested and deployed in various enterprise environments with serving zillions of transactions. The ultimate reason behind this resounding success is it's high performance HTTP transport implementation known as Pass-Through Transport which provides efficient mechanism to process client requests in a highly concurrent scenarios. In this blog post/s we are going to give you some introduction in to PTT by covering some of the theories behind this implementation. The actual implementation is far more complex than described in this tutorial and I have added some useful resources whenever possible to provide you more information. Most of the content present in this tutorial are extracted from following blog posts/tutorials on the web. I would like to give credit to those authors for writing such great content. http://tutorials.jenkov.com/java-nio/index.html http://jeewanthad.blogs...