Book Image

Node.js Design Patterns - Third Edition

By : Mario Casciaro, Luciano Mammino
5 (1)
Book Image

Node.js Design Patterns - Third Edition

5 (1)
By: Mario Casciaro, Luciano Mammino

Overview of this book

In this book, we will show you how to implement a series of best practices and design patterns to help you create efficient and robust Node.js applications with ease. We kick off by exploring the basics of Node.js, analyzing its asynchronous event driven architecture and its fundamental design patterns. We then show you how to build asynchronous control flow patterns with callbacks, promises and async/await. Next, we dive into Node.js streams, unveiling their power and showing you how to use them at their full capacity. Following streams is an analysis of different creational, structural, and behavioral design patterns that take full advantage of JavaScript and Node.js. Lastly, the book dives into more advanced concepts such as Universal JavaScript, scalability and messaging patterns to help you build enterprise-grade distributed applications. Throughout the book, you’ll see Node.js in action with the help of several real-life examples leveraging technologies such as LevelDB, Redis, RabbitMQ, ZeroMQ, and many others. They will be used to demonstrate a pattern or technique, but they will also give you a great introduction to the Node.js ecosystem and its set of solutions.
Table of Contents (16 chapters)
14
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15
Index

Fundamentals of a messaging system

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

In the sections that follow, we are going to formalize these aspects to provide a base for our later discussions.

One way versus request/reply patterns

The most fundamental aspect in 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...