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Node.js Design Patterns

You're reading from   Node.js Design Patterns Design and implement production-grade Node.js applications using proven patterns and techniques

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Product type Paperback
Published in Jul 2020
Publisher Packt
ISBN-13 9781839214110
Length 664 pages
Edition 3rd Edition
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Authors (2):
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Luciano Mammino Luciano Mammino
Author Profile Icon Luciano Mammino
Luciano Mammino
Mario Casciaro Mario Casciaro
Author Profile Icon Mario Casciaro
Mario Casciaro
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Table of Contents (16) Chapters Close

Preface 1. The Node.js Platform 2. The Module System FREE CHAPTER 3. Callbacks and Events 4. Asynchronous Control Flow Patterns with Callbacks 5. Asynchronous Control Flow Patterns with Promises and Async/Await 6. Coding with Streams 7. Creational Design Patterns 8. Structural Design Patterns 9. Behavioral Design Patterns 10. Universal JavaScript for Web Applications 11. Advanced Recipes 12. Scalability and Architectural Patterns 13. Messaging and Integration Patterns 14. Other Books You May Enjoy
15. Index

Publish/Subscribe pattern

Publish/Subscribe (often abbreviated to Pub/Sub) is probably the best-known one-way messaging pattern. We should already be familiar with it, as it's nothing more than a distributed Observer pattern. As in the case of Observer, we have a set of subscribers registering their interest in receiving a specific category of messages. On the other side, the publisher produces messages that are distributed across all the relevant subscribers. Figure 13.7 shows the two main variants of the Pub/Sub pattern; the first is based on a peer-to-peer architecture, and the second uses a broker to mediate the communication:

Figure 13.7: Publish/Subscribe messaging pattern

What makes Pub/Sub so special is the fact that the publisher doesn't know in advance who the recipients of the messages are. As we said, it's the subscriber that has to register its interest to receive a particular message, allowing the publisher to...

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