Book Image

Mastering Node.js

By : Sandro Pasquali
Book Image

Mastering Node.js

By: Sandro Pasquali

Overview of this book

Node.js is a modern development stack focused on providing an easy way to build scalable network software. Backed by a growing number of large companies and a rapidly increasing developer base, Node is revolutionizing the way that software is being built today. Powered by Google's V8 engine and built out of C++ modules, this is a JavaScript environment for the enterprise.Mastering Node.js will take the reader deep into this exciting development environment. Beginning with a comprehensive breakdown of its innovative non-blocking evented design, Node's structure is explained in detail, laying out how its blazingly fast I/O performance simplifies the creation of fast servers, scalable architectures, and responsive web applications.Mastering Node.js takes you through a concise yet thorough tour of Node's innovative evented non-blocking design, showing you how to build professional applications with the help of detailed examples.Learn how to integrate your applications with Facebook and Twitter, Amazon and Google, creating social apps and programs reaching thousands of collaborators on the cloud. See how the Express and Path frameworks make the creation of professional web applications painless. Set up one, two, or an entire server cluster with just a few lines of code, ready to scale as soon as you're ready to launch. Move data seamlessly between databases and file systems, between clients, and across network protocols, using a beautifully designed, consistent, and predictable set of tools.Mastering Node.js contains all of the examples and explanations you'll need to build applications in a short amount of time and at a low cost, running on a scale and speed that would have been nearly impossible just a few years ago.
Table of Contents (20 chapters)
Mastering Node.js
About the Author
About the Reviewers

Listening for events

In the previous chapter we were introduced to the EventEmitter interface. This is the primary event interface we will be encountering as we move chapter to chapter, as it provides the prototype class for the many Node objects exposing evented interfaces, such as file and network streams. Various close, exit, data, and other events exposed by different module APIs signal the presence of an EventEmitter interface, and we will be learning about these modules and use cases as we progress.

Instead, the primary purpose of this section is to discuss some lesser-known event sources—signals, child process communication, filesystem change events, and deferred execution.


In many ways, evented programming is like hardware interrupt programming. Interrupts do exactly what their name suggests. They use their ability to interrupt whatever a controller or the CPU or any other device is doing, demanding that their particular need be serviced immediately.

In fact, the Node process...