Book Image

Learning Play! Framework 2

By : Andy Petrella
Book Image

Learning Play! Framework 2

By: Andy Petrella

Overview of this book

<p>The Learning Play! Framework 2 has been created for web developers that are building web applications. The core idea is to focus on the HTTP features and to enable them through a simplification lens. Building a web application no longer requires a configuration phase, an environment setup, or a long development lifecycle - it's integrated!<br /><br />Learning Play! Framework 2 will enable any web developers to create amazing web applications taking advantage of the coolest features. It's the fastest way to dive into Play!, focusing on the capabilities by using them in a sample application. Although essentially Java based code, a Scala version is presented as well – giving an opportunity to see some Scala in action.<br /><br />After setting up the machine and learning some Scala, you will construct an application which builds from static to dynamic, before introducing a database. <br /><br />Then we'll focus on how data can be consumed and rendered in several ways. This will enable some real time communication through WebSocket and Server-Sent Event – on both server and client sides.</p> <p>The book will end with testing and deployment, which completes any web development project.</p>
Table of Contents (20 chapters)
Learning Play! Framework 2
Credits
About the Author
Acknowledgement
About the Reviewers
www.packtpub.com
Preface
Materials
Index

Real time (advanced)


The Web has changed; HTML5 is almost there and is already implemented by all browsers. At least, the useful parts of it are available, especially the parts we'll use in this section.

It's now very familiar and it won't surprise you anymore, but Play! Framework 2 will again demonstrate that it is a real web framework by integrating things such as WebSocket or its old fallback, Comet .

Actually, Comet is not really a fallback for WebSocket since it's unidirectional while the latter is bidirectional. Nevertheless, there is another specification that does the same as Comet: Server-Sent Events (SSE). Even if an implementation of SSE is not (yet) provided by default, Play! 2's API will help us a lot in implementing it on our own really easily. This tool in hand, our application would have a really good push mechanism in place.

In this chapter, we'll focus on the most popular one, which is WebSocket. Hopefully, this is the one we'll need in our application to make it more responsive...