Sandesha2

The Apache Sandesha2 project was started to provide a reliability layer for Apache Axis2. Sandesha2 is well on its way past the 1.2 stage and has gathered a faithful user and developer community around it. Chamikara Jayalath, a key contributor to the Sandesha2 project, speaks about the product and the main features of it.

Open source computing has gained a tremendous degree of momentum in the last few years. Nowhere is this more evident than in the area of web services and Service-Oriented Architecture (SOA). The Apache Foundation alone has more than 20 SOA/WS projects.

In this presentation made at JavaPolis 2006 Paul Fremantle covers how the OASIS Web Services Reliable Messaging standard allows Web services interactions and messages to be reliably delivered. Web Services ReliableMessaging (WSRM) is a protocol that supports MQ or JMS like levels of reliable delivery on a completely open basis, with interoperability between systems including WebSphere, Apache Axis2 and Microsoft .NET.

According to the WSRM specification Apache Sandesha2 has to send several control messages back and forth during your application message exchange. When doing a two-way message exchange you need to be aware of certain details including additional configurations to perform this message exchange accurately. This tutorial by Chamikara Jayalath gives you an insight into those details.

This article by Chamikara Jayalath describes the architectural challenges of integrating Apache Sandesha2 and Apache Rampart in a modular manner and the steps taken to overcome those challenges. Apache Sandesha2 and Apache Rampart are the most widely used WSRM and WS-Security/WS-SecureConversation implementations in Apache Axis2. The article is also useful for someone who needs to integrate a different WS-Security/WS-SecureConversation implementation with Apache Sandesha2.

The Axis2 client API allows you to pass various properties into the system using the Options object. The Options object is a part of the MessageContexts that are created for each invocation. The properties are used by the core Apache Axis2/Java engine or any other module that you deploy into it.

You can use Sandesha2 listeners to get notified when specific events happen in the Apache Sandesha2 system. You will most probably be registering your listener in the client code. Calling back could happen within any time of the execution of Sandesha2.