The Art of Microservices Integration Using Service Choreography

Looking back

Looking forward

Service orchestration vs service choreography

Clarifying asynchronous integration in service choreography

  • Non-blocking I/O — I’m an advocate of asynchronous, non-blocking I/O as part of building more efficient, resilient and scalable services that interact in some way with external I/O. However, in the context of service choreography, this is certainly not what we mean by asynchronous integration. Non-blocking I/O could still be used within the request/response cycle for orchestration use cases, and, whilst it has its advantages in one sense, certainly doesn’t, on its own, buy any architectural benefits of isolation and autonomy.
  • Classic MQ Request/Reply — It’s possible using classic MQ technology (e.g. JMS, AMQP) to achieve asynchronous request/reply behaviour. You could pop a message on a queue, and wait for a response on some temporary reply queue. There’s certainly some added decoupling in that the caller needn’t know exactly who will reply, but, like with non-blocking I/O, if this is being done as part of a service handling an incoming request, then, despite the communication with the MQ itself being asynchronous in nature, the service is still not acting autonomously. If a consumer responsible for replying is down, and the call must then timeout, it’s ultimately no different to an HTTP endpoint being unavailable or failing.

End-to-end autonomy

Added complexity?

Touching on boundaries

Coming next

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Software engineering nut. Cyclist. Musician. Dog lover

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Andrew Easter

Andrew Easter

Software engineering nut. Cyclist. Musician. Dog lover

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