Jean-Francois Arcand works for Ning.com. Previously he has worked for Sun Microsystems where he created Grizzly (NIO Framework) , Atmosphere and was a significant contributor to the GlassFish Application Server. Jean-Francois is a DZone MVB and is not an employee of DZone and has posted 23 posts at DZone. You can read more from them at their website. View Full User Profile

Using Google Guice with Atmosphere

01.19.2010
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Starting with Atmosphere 0.5, you can now use Google Guice to configure Atmosphere.

Google Guice
support is enabled by referencing the Guice filter GuiceFilter and an application specific ServletContextListener that extends from GuiceServletContextListener in the web.xml. For example, the web.xml may be as follows:

   <web-app>
     <listener>
       <listener-class>org.atmosphere.samples.<b style="color: black; background-color: rgb(160, 255, 255);">guice</b>.GuiceChatModule</listener-class>
     </listener>
     <filter>

       <filter-name><b style="color: black; background-color: rgb(160, 255, 255);">Guice</b> Filter</filter-name>
       <filter-class>com.google.inject.servlet.GuiceFilter</filter-class>
     </filter>
     <filter-mapping>
       <filter-name><b style="color: black; background-color: rgb(160, 255, 255);">Guice</b> Filter</filter-name>

       <url-pattern>/*</url-pattern>
     </filter-mapping>
   </web-app>

and the application specific servlet context listener may be as follows:

public class GuiceChatConfig extends GuiceServletContextListener {

    @Override
    protected Injector getInjector() {
        return <b style="color: black; background-color: rgb(160, 255, 255);">Guice</b>.createInjector(new GuiceChatModule());
    }
} 

with:

public class GuiceChatModule  extends ServletModule{

    @Override
    protected void configureServlets(){
        Map params = new HashMap();
        params.put(PackagesResourceConfig.PROPERTY_PACKAGES, "org.atmosphere.samples.<b style="color: black; background-color: rgb(160, 255, 255);">guice</b>");
        serve("/chat*").with(AtmosphereGuiceServlet.class, params);
    }
} 


That's it. You can download the previously Atmosphere-Jersey sample, this time Guice enabled from here. For any questions or to download Atmosphere, go to our main site and use our Nabble forum (no subscription needed) or follow us on Twitter and tweet your questions there!

Published at DZone with permission of Jean-Francois Arcand, author and DZone MVB.

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