Queues and Saga Patterns

[Dmitry Mikhaylov]

Hello everybody,

Reading documentation and playing around with code I got couple questions that, I believe, you can help me with:

  1. Azure Service Bus has separate permissions set for shared keys. Is it possible to give a mass transit receiving endpoint read-only access to Azure Service Bus?

      Now when I tried to connect with read-only shared key, mass transit said that it needs management permissions.

  2. If I got saga pattern right, main responsibility of saga is to coordinate and correlate events in a distributes app. Am I right with idea that when saga reacts on incoming message it fires a command to a queue for processing. With that in place saga receiving queue should be different, right? 

  This is how I understand flow and setup (see attached draft picture).

     - Saga is registered on receiving endpoint on queue "saga_queue". For instance saga coordinates two data processing steps: Processor A and Processor B. When saga is initialized it should send processing command to queue "a_processing_queue".

     - When processing A is done, sage translates to another step and kicks processing B.

     - Auto-scaled set of Processors A are receiving on queue "a_processing_queue". 

     - When processor A done with a task it publishes event "Processor A is done with the task".

     - A event it would be received on all endpoints. Saga instance will react on this event.

     - With this step Saga will send command to "b_processing_queue".

     - When Data Processor B is done with processing it publish "Processor B is done with the task" event.

     -  Saga reacts on the event, translates to final step.

Please let me know if this does not make sense, or if I got the thing wrong.

Regards,

Dmytro

[Chris Patterson]

MassTransit requires manage permissions for access to service bus. 

__
Chris Patterson

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