Enterprise Integration for Beginners

I have written several blog posts explaining the internal behavior of the ESB and the threads created inside ESB. With this post, I am talking about the effect of threads in the WSO2 ESB and how to tune up threads for optimal performance. You can refer [1] and [2] to understand the threads created within the ESB. [1] http://soatutorials.blogspot.com/2015/05/understanding-threads-created-in-wso2.html [2] http://wso2.com/library/articles/2012/03/importance-performance-wso2-esb-handles-nonobvious/ Within this blog post, I am discussing about the "worker threads" which are used for processing the data within the WSO2 ESB. There are 2 types of worker threads created when you start sending the requests to the server 1) Server Worker/Client Worker Threads 2) Mediator Worker (Synapse-Worker) Threads Server Worker/Client Worker Threads These set of threads will be used to process all the requests/responses coming to the ESB server. ServerWorker Threads will be used to pr...

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. With the default settings, it will provide a really good performance OOTB. You can find the official performance tuning guide in the below link. https://docs.wso2.com/display/ESB481/Performance+Tuning Above document includes lot of parameters and how to change them for best performance. Even though it provides some recommended values for the performance tuning, that is not straightforward. The values you put in the configuration files will highly reliant on your use case. Idea of this blog post is to provide a practical example of tuning these parameters with a sample use case. For the performance testing, I am using a simple proxy service which iterate through set of xml elements and send request to a sample server and aggregate the responses back to the client. <?xml version="1.0" encoding="UTF-8"?> <proxy xmlns="http://ws.apache.org/ns/synapse"     ...

Naming Conventions When developing artifacts for WSO2 servers, follow the guidelines mentioned below. Project names - Create project names which reflects the intention of the project. It is better to end the project name with the server type which this project is deployed in to. This name should be unique within your source code repository Artifact names - When you create artifacts, always better to start the name with the project name and end with the artifact type. This would make the artifact name unique within the source repository. Custom Java Classes - When you create custom java code (custom mediators, custom formatters), adhere to the standard java packaging names with project names to distinguish your code Project Structures When developing artifacts for WSO2 servers, follow the guidelines mentioned below Start with a “Maven multi module” project as your parent project. This will be the top most level project in your source code hierarchy. ...

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...