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)
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Task distribution patterns

In Chapter 11Advanced Recipes, you learned how to delegate costly tasks to multiple local processes. Even though this was an effective approach, it cannot be scaled beyond the boundaries of a single machine, so in this section, we are going to see how it's possible to use a similar pattern in a distributed architecture, using remote workers located anywhere in a network.

The idea is to have a messaging pattern that allows us to spread tasks across multiple machines. These tasks might be individual chunks of work or pieces of a bigger task split using a divide and conquer approach.

If we look at the logical architecture represented in the following diagram, we should be able to recognize a familiar pattern:

Figure 13.15: Distributing tasks to a set of consumers

As we can see from the diagram of Figure 13.15, the Publish/Subscribe pattern is not suitable for this type of application, as we absolutely don...