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bhalchandraswcg
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Previous – Competing Consumers | Index | Next – Selective Consumer


This week, we'll study a pattern known as Message Dispatcher.

When do I use this pattern?


Message Dispatcher is required to coordinate between Competing Consumers when the consumers are not interchangeable. Interchangeable consumers would basically have the same code or are able to redirect the message to appropriate peer consumer for processing. We looked at creating Competing Consumers having the same code in the previous blog. In this blog, we'll see how to create a message dispatcher to coordinate between Competing Consumers that do not have the same code.

Message Dispatcher in CPI


For the demonstration, consider that IDocs sent by the ECC system get enqueued in 'IDocs' queue before processing. A message dispatcher reads from the queue and invokes the performer of individual IDocs.

IDoc Producer



Get IDocs


This integration flow receives the IDocs from ECC and enqueues them into the 'IDocs' queue.

Message Dispatcher



Dispatch IDocs


This integration flow acts as a Message Dispatcher. It consumes the message from 'IDocs' queue and triggers relevant flow using ProcessDirect Receiver Adapter based on the IDoc Type.

Here, the Address in ProcessDirect is configured to /ECC/${header.SapIDocType}.

Note that this implementation of message dispatcher dispatches the messages based on the message type alone. The load on individual performers is not controlled in the dispatcher.

Performer(s)


Customer Master



Customer Master Performer


For the simplicity of the blog, the Performer of the Customer Master simply forwards the IDoc to the CRM system.

Delivery



Delivery Performer


Similar to Customer Master Performer, Delivery Performer forwards the message to Delivery System.

Conclusion


Message Dispatcher acts as a coordinator between Competing Consumers when Consumers are not interchangeable.

References/Further Readings



Hope this helps,
Bala

Previous – Competing Consumers | Index | Next – Selective Consumer

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