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  • Dependent/Sequential Async Service Execution?

    I have a workflow which I would like to implement in Spring Integration which is roughly this:

    1) Message enters input channel
    2) Service A gets the message
    3) Service A calls external asynchronous service to process message
    4) Service A needs to enter a "wait state" until message returns from external service
    5) Service A then needs to pass message to Service B. Service B depends on results from Service A so cannot execute out-of-order.
    6) Service B calls external asynchronous service to process message
    7) Wash, rinse, repeat
    8) Service Z needs to pass resultants message(s) to output channel

    How would I implement this in Spring Integration?

    My experience on other projects has been with jBPM and with that BPM engine, I could specify that nodes enter a "wait state" or "task list" depending on situation until an asynchronous job called back. Are there similar concepts in Spring Integration or do I need to implement a workflow engine into the architecture?

    If I do need to implement a workflow engine, which is recommended with Spring Integration which would provide this exact functionality?