001/*
002  GRANITE DATA SERVICES
003  Copyright (C) 2011 GRANITE DATA SERVICES S.A.S.
004
005  This file is part of Granite Data Services.
006
007  Granite Data Services is free software; you can redistribute it and/or modify
008  it under the terms of the GNU Library General Public License as published by
009  the Free Software Foundation; either version 2 of the License, or (at your
010  option) any later version.
011
012  Granite Data Services is distributed in the hope that it will be useful, but
013  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
014  FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
015  for more details.
016
017  You should have received a copy of the GNU Library General Public License
018  along with this library; if not, see <http://www.gnu.org/licenses/>.
019*/
020
021package org.granite.tide.seam.async;
022
023import static org.jboss.seam.annotations.Install.FRAMEWORK;
024
025import org.granite.gravity.Gravity;
026import org.granite.gravity.GravityManager;
027import org.granite.tide.async.AsyncPublisher;
028import org.jboss.seam.ScopeType;
029import org.jboss.seam.annotations.AutoCreate;
030import org.jboss.seam.annotations.Install;
031import org.jboss.seam.annotations.Name;
032import org.jboss.seam.annotations.Scope;
033import org.jboss.seam.annotations.intercept.BypassInterceptors;
034import org.jboss.seam.contexts.ServletLifecycle;
035
036import flex.messaging.messages.AsyncMessage;
037
038
039/**
040 * Async publisher using Gravity to send messages to the client
041 * 
042 * @author William DRAI
043 */
044@Name("org.granite.tide.seam.async.publisher")
045@Install(precedence=FRAMEWORK, classDependencies={"org.granite.gravity.Gravity"})
046@Scope(ScopeType.STATELESS)
047@BypassInterceptors
048@AutoCreate
049public class SeamAsyncPublisher implements AsyncPublisher {
050    
051    public static final String DESTINATION_NAME = "seamAsync";
052    
053    private Gravity getGravity() {
054        return GravityManager.getGravity(ServletLifecycle.getServletContext());
055    }
056
057    public void initThread() {
058        Gravity gravity = getGravity();
059        if (gravity == null)
060                throw new RuntimeException("Gravity service not configured, it is required for asynchronous event publishing");
061        
062        gravity.initThread(null, null);
063    }
064    
065    public void publishMessage(String sessionId, Object body) {
066        AsyncMessage message = new AsyncMessage();
067        message.setHeader(AsyncMessage.SUBTOPIC_HEADER, "tide.events." + sessionId);
068        message.setDestination(DESTINATION_NAME);
069        message.setBody(body);
070        
071        getGravity().publishMessage(message);
072    }
073}