Node.js 8 the Right Way

Pushing and Pulling Messages

So far we’ve worked with two major message-passing patterns: publish/subscribe and request/reply. ØMQ offers one more pattern that’s sometimes a good fit with Node.js—push/pull (PUSH/PULL).

Pushing Jobs to Workers

The PUSH and PULL socket types are useful when you have a queue of jobs that you want to assign among a pool of available workers.

Recall that with a PUB/SUB pair, each subscriber will receive all messages sent by the publisher. In a PUSH/PULL setup, only one puller will receive each message sent by the pusher.

A PUSH socket will distribute messages in a round-robin fashion to connected sockets, just like a DEALER. But unlike the DEALER/ROUTER flow, there is no backchannel. A message traveling from a PUSH ...