Book Image

Play Framework Essentials

By : Julien Richard-Foy
Book Image

Play Framework Essentials

By: Julien Richard-Foy

Overview of this book

Table of Contents (14 chapters)
Play Framework Essentials
About the Author
About the Reviewers

Saving computation time using cache

Using a cache can help you to avoid computing things several times. Web applications support two kinds of caches: server-side and client-side caches. The latter can save HTTP round trips. In both cases, dealing with expiration can be a complex task!

Play provides a minimal cache library and some controller level caching features that can help you leverage both client-side and server-side caches. The implementation uses EhCache under the hood and, by default, caches things in memory only. You'll find more about EhCache at

To use it, you first need to add it to your build dependencies:

libraryDependencies += cache

The cache basically works as a key-value store. You can store values for a given duration and retrieve them using a key. Let's use it in the Application.index action that just displays a static HTML page:

import play.api.cache.Cache
val index = Action {

The getOrElse method...