Mediator processes sequential routing rules based on the following principles:

• Mediator evaluates routings and performs the resulting actions sequentially. Sequential routings are evaluated in the same thread and transaction as the caller.

• Mediator always enlists itself into the global transaction propagated through the thread that is processing the incoming message. For example, if an inbound JCA adapter invokes a Mediator, the Mediator enlists itself with the transaction that the JCA adapter has initiated.

• Mediator propagates the transaction through the same thread as the target components while executing the sequential routing rules.

• Mediator never commits or rolls back transactions propagated by external entities.

• Mediator manages the transaction only if the thread-invoking Mediator does not already have an active transaction. For example, if Mediator is invoked from inbound SOAP services, Mediator starts a transaction and commits or rolls back the transaction depending on success and failure.