AtmosphereFilter.java

package au.com.vaadinutils.servlet;

/**
 * Designed to inject the EntityManager into requests that arrive via websockets (Vaadin Push) as these
 * do not go through the standard servlet filter mechanism.
 * 
 * This class is installed by adding a parameter to the VaadinServlet mapping in web.xml.
 * 
 * e.g.
 * 	<servlet>
		<servlet-name>Vaadin Application Servlet</servlet-name>
		<servlet-class>com.vaadin.server.VaadinServlet</servlet-class>
		<init-param>
			<description>Vaadin UI to display</description>
			<param-name>UI</param-name>
			<param-value>au.org.scoutmaster.application.NavigatorUI</param-value>
		</init-param>
		<init-param>
			<param-name>org.atmosphere.cpr.AtmosphereInterceptor</param-name>
			<!-- comma-separated list of fully-qualified class names -->
			<param-value>au.com.vaadinutils.servlet.AtmosphereFilter</param-value>
		</init-param>
		<async-supported>true</async-supported>
	</servlet>

 * 
 */

public class AtmosphereFilter 
{}

//public class AtmosphereFilter extends AtmosphereInterceptorAdapter
//{
//	Transaction t;
//
//	public Action inspect(AtmosphereResource r)
//	{
//		// do pre-request stuff
//
//		EntityManager em = EntityManagerProvider.createEntityManager();
//		t = new Transaction(em);
//
//		// Create and set the entity manager
//		EntityManagerProvider.setCurrentEntityManager(em);
//
//		return super.inspect(r);
//	}
//
//	// do post-request stuff (Vaadin request handling is done at this point)
//	public void postInspect(AtmosphereResource r)
//	{
//		try
//		{
//			t.commit();
//		}
//		catch (Throwable e)
//		{
//			throw new RuntimeException(e);
//		}
//		finally
//		{
//			// Reset the entity manager as we get a new one everytime we inspect is called.
//			EntityManagerProvider.setCurrentEntityManager(null);
//		}
//
//
//	}
//}