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)
Other Books You May Enjoy


A proxy is an object that controls access to another object, called the subject. The proxy and the subject have an identical interface, and this allows us to swap one for the other transparently; in fact, the alternative name for this pattern is surrogate.

A proxy intercepts all or some of the operations that are meant to be executed on the subject, augmenting or complementing their behavior. Figure 8.1 shows a schematic representation of this pattern:

Figure 8.1: Proxy pattern schematic

Figure 8.1 shows us how the proxy and the subject have the same interface, and how this is transparent to the client, who can use one or the other interchangeably. The proxy forwards each operation to the subject, enhancing its behavior with additional preprocessing or postprocessing.

It's important to observe that we are not talking about proxying between classes; the Proxy pattern involves wrapping an actual instance of the subject, thus preserving its internal...