Fundamentals of a Messaging System
Get familiar with the basics and functionality of messaging systems in Node.js applications.
When talking about messages and messaging systems, there are four fundamental elements to take into consideration:
The direction of the communication, which can be one-way only or a request/reply exchange
The purpose of the message, which also determines its content
The timing of the message, which can be sent and received in-context (synchronously) or out-of-context (asynchronously)
The delivery of the message, which can happen directly or via a broker
One-way vs. request/reply patterns
The most fundamental aspect of a messaging system is the direction of the communication, which often also determines its semantics.
The simplest communication pattern is when the message is pushed one way from a source to a destination; this is a trivial situation, and it doesn’t need much explanation:
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