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

Understanding the event loop

Node processes JavaScript instructions using a single thread. Within your JavaScript program no two operations will ever execute at exactly the same moment, as might happen in a multithreaded environment. Understanding this fact is essential to understanding how a Node program, or process, is designed and runs.

This does not mean that only one thread is being used on the machine hosting this a Node process. Simply writing a callback does not magically create parallelism! Recall Chapter 1, Understanding the Node Environment, and our discussion about the process object—Node's "single thread" simplicity is in fact an abstraction created for the benefit of developers. It is nevertheless crucial to remember that there are many threads running in the background managing I/O (and other things), and these threads unpredictably insert instructions, originally packaged as callbacks, into the single JavaScript thread for processing.

Node executes instructions one by one until...