Chapter 3. Advanced Request-Reply Patterns

In Chapter 2, we worked through the basics of using ØMQ by developing a series of small applications, each time exploring new aspects of ØMQ. We’ll continue this approach in this chapter as we explore advanced patterns built on top of ØMQ’s core request-reply pattern.

We’ll cover:

  • How the request-reply mechanisms work

  • How to combine REQ, REP, DEALER, and ROUTER sockets

  • How ROUTER sockets work, in detail

  • The load-balancing pattern

  • Building a simple load-balancing message broker

  • Designing a high-level API for ØMQ

  • Building an asynchronous request-reply server

  • A detailed inter-broker routing example

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