Jawr - Introduction

Introduction

To increase performance, Jawr generates IDs (hashcode) for each bundles, which is integrated in the resource URL, so the browser will be able to cache a bundle if it didn’t change.

By default, Jawr uses the String hashcode method to define the ID of the bundle.
Since the version 3.3, Jawr allows users to define their own hashcode bundle generator.

Hashcode bundle generator

A new interface net.jawr.web.resource.bundle.hashcode.BundleHashcodeGenerator has been created to allow the user to define their own hashcode bundle generator.

Hashcode bundle generator class diagram

BundleHashcodeGenerator : This interface defines the method which is used to determine the hashcode of a bundle.
BundleStringHashcodeGnerator : This class defines the hashcode generator which uses the String hashcode method as the hashcode of a bundle.
MD5BundleHashcodeGnerator : This class defines the hashcode generator which uses the MD5 hashcode of the bundle content as the hashcode of a bundle.

Hashcode bundle generator setting

To set the bundle Hashcode generator which you want to use, you should use the following jawr configuration property.

Property name	Type	Purpose	Default value
jawr.bundle.hashcode.generator	String	The class name of the hashcode bundle generator or MD5 if you want to use the MD5 algorithm for the hashcode.	none