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Mastering JavaScript Design Patterns

You're reading from   Mastering JavaScript Design Patterns Discover how to use JavaScript design patterns to create powerful applications with reliable and maintainable code

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Product type Paperback
Published in Nov 2014
Publisher
ISBN-13 9781783987986
Length 290 pages
Edition 1st Edition
Languages
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Author (1):
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Simon Timms Simon Timms
Author Profile Icon Simon Timms
Simon Timms
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Toc

Chapter 9. Messaging Patterns

When Smalltalk was first envisioned, the communication between classes was envisioned as being messages. Somehow we've moved away from this pure idea of messages. We spoke a bit about how functional programming avoids side effects; well, much the same is true of messaging-based systems.

Messaging also allows for impressive scalability as messages can be fanned out to dozens or even hundreds of computers. Within a single application, messaging promotes low coupling and eases testing.

In this chapter, we're going to look at a number of patterns related to messaging. By the end of the chapter, you should be aware of how messages work. When I first learned about messaging, I wanted to rewrite everything using it.

We will be covering:

  • What's a message anyway?
    • Commands
    • Events
  • Request-reply
  • Publish-subscribe
    • Fan out and fan in
  • Dead-letter queues
  • Message replay
  • Pipes and filters

What's a message anyway?

In the simplest definition, a message is a collection...

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