Installation

grails install-plugin cometd

CometD Plugin

CometD is a scalable HTTP-based event routing bus that uses an Ajax Push technology pattern known as Comet.

This plugin allows your Grails application to send asynchronous notifications to HTTP clients using CometD and the Bayeux protocol.

Usage

CometD Servlet

The plugin configures a CometdServlet, mapped to the path cometd relative to your web application's context path.

Bayeux Service

A bean named bayeux is made available to your application. It is an instance of BayeuxServer. This is used to interact with the Comet server.

Configuration

The plugin is configured in Config.groovy, with options prefixed with "plugins.cometd". The following options are defined:

• continuationFilter.disable: if set, do not install the to ContinuationFilter

Development

The plugin sources are on GitHub:

git clone git://github.com/marcusb/grails-cometd.git

Further information

see http://metasieve.wordpress.com/2010/08/25/using-cometd-2-x-with-grails/ for an example as to how to use CometD 2.x with Grails and this plugin.

History

Version 0.2.2

• Support for Grails 1.2.1 and later.
• Update to CometD 2.0.0 release.

Version 0.2.1

• Install the ContinuationFilter by default, it is needed for Tomcat 6.

Version 0.2

• Rewritten from scratch for CometD 2.0.