Mediation programming

Using the capabilities of the mediation infrastructure, you can program mediations to customize the way that a service integration bus handles messages. You develop the mediation code within a component called a mediation handler, and add the mediation handler to a handler list, which is an application that is ready to deploy and install. You can connect a number of mediation handlers together in a mediation handler list to create a set of operations to run on a message.

A mediation handler is a Java program framework to which you add the code that operates on a message to perform the mediation function. For example, you can program mediations to process messages in any of the following ways:
The following programming APIs are available for working with messages when you program a mediation:
MediationHandler API
A mediation handler must implement the MediationHandler interface. This interface defines the method that is invoked by the mediation runtime environment.
SIMessage and SIMessageContext APIs
These APIs allow your mediation to operate on the contents of the message.
SIMediationSession API
This API gives your mediation access to a service integration bus so that the mediation can send and receive messages.

You create a handler list by using an assembly tool, for example IBM® Rational® Application Developer, before deploying the mediation handler application as an Enterprise Archive (EAR file).

A handler list can contain one or many mediation handlers. At run time, each mediation handler in the list is invoked in sequence. Each time a handler returns a value of True, the same message context is passed to the next handler. If a handler returns the value False, then the context is not passed to the next handler. The message is discarded, and is not delivered to its target destination.




Related tasks
Writing a mediation handler
Related reference
MediationHandler
SIMessageContext
SIMessage
SIMediationSession
Related information
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