Example of the use of trigger type DEPTH

 

Consider a travel agency application that creates a single request to confirm a flight reservation, to confirm a reservation for a hotel room, to rent a car, and to order some travelers’ checks. The application could separate these items into four request messages, sending each to a separate destination. It could set a trigger of type DEPTH on its reply-to queue (with the depth set to the value 4), so that it is restarted only when all four replies have arrived.

If another message (possibly from a different request) arrives on the reply-to queue before the last of the four replies, the requesting application is triggered early. To avoid this, when using DEPTH triggering to collect multiple replies to a request, always use a new reply-to queue for each request.

 

Parent topic:

Controlling trigger events

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