Book Image

Practical XMPP

By : Steven Watkin, David Koelle
Book Image

Practical XMPP

By: Steven Watkin, David Koelle

Overview of this book

XMPP (eXtensible Messaging and Presence Protocol) is a messaging protocol that enables communication between two or more devices via the Internet. With this book, developers will learn about the fundamentals of XMPP, be able to work with the core functionality both server-side and in the browser, as well as starting to explore several of the protocol extensions. You will not only have a solid grasp of XMPP and how it works, but will also be able to use the protocol to build real-world applications that utilize the power of XMPP. By the end of this book, you will know more about networking applications in general, and have a good understanding of how to extend XMPP, as well as using it in sample applications.
Table of Contents (16 chapters)
Practical XMPP
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Free Chapter
1
An Introduction to XMPP and Installing Our First Server

Chapter 7.  Creating an XMPP Component

If you're ever going to build custom functionality or implement your own business logic on top of existing XMPP standards, arguably the best way to do it is by creating a component. XMPP components are software modules that run on the server side but do not require modification of the server itself. This means you can easily update or upgrade your XMPP server without your own code getting in the way. You can also easily move components to other servers. And when writing your own component, there isn't even a need to implement it in the same language as your server!

The specifications for components are laid out in XEP-0114 (http://xmpp.org/extensions/xep-0114.html), which covers the connection flow for a component.

In this chapter, we'll learn how components connect with servers, and then delve straight into building a very simple component that is able to respond to DISCO requests and pings and can echo messages back to the user.