Showing posts from April, 2010

Dead Letter Channel Enterprise Application Integration Pattern

Dead Letter Channel Pattern belongs to the Category of Message Channel patterns which describes the Message transport level attributes. Idea of having a dead letter channel is to handle Message failures. Message failures can be occurred due to several reasons. Transport level failures Due to bad Configuration Message Expiration Problem with Message Consumer end In a failure Message will be routed to the dead letter channel. So that it can act as a Message archive mechanism , Re router or a special channel to process the bad messages. Having a Message archive system will be useful since later a Dead message can be viewed and re-delivered to the intended end point manually by a admin console.This will be useful to identify the Configuration problems Message Re-delivery is also a major part of a dead letter channel implementation. If we take a normal scenario like simple DB quarries or web-service calls some times a message will fail because of the endpo