001/**
002 *   GRANITE DATA SERVICES
003 *   Copyright (C) 2006-2013 GRANITE DATA SERVICES S.A.S.
004 *
005 *   This file is part of the Granite Data Services Platform.
006 *
007 *   Granite Data Services is free software; you can redistribute it and/or
008 *   modify it under the terms of the GNU Lesser General Public
009 *   License as published by the Free Software Foundation; either
010 *   version 2.1 of the License, or (at your option) any later version.
011 *
012 *   Granite Data Services is distributed in the hope that it will be useful,
013 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
014 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
015 *   General Public License for more details.
016 *
017 *   You should have received a copy of the GNU Lesser General Public
018 *   License along with this library; if not, write to the Free Software
019 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
020 *   USA, or see <http://www.gnu.org/licenses/>.
021 */
022package org.granite.tide.seam.async;
023
024import static org.jboss.seam.annotations.Install.FRAMEWORK;
025
026import org.granite.gravity.Gravity;
027import org.granite.gravity.GravityManager;
028import org.granite.tide.async.AsyncPublisher;
029import org.jboss.seam.ScopeType;
030import org.jboss.seam.annotations.AutoCreate;
031import org.jboss.seam.annotations.Install;
032import org.jboss.seam.annotations.Name;
033import org.jboss.seam.annotations.Scope;
034import org.jboss.seam.annotations.intercept.BypassInterceptors;
035import org.jboss.seam.contexts.ServletLifecycle;
036
037import flex.messaging.messages.AsyncMessage;
038
039
040/**
041 * Async publisher using Gravity to send messages to the client
042 * 
043 * @author William DRAI
044 */
045@Name("org.granite.tide.seam.async.publisher")
046@Install(precedence=FRAMEWORK, classDependencies={"org.granite.gravity.Gravity"})
047@Scope(ScopeType.STATELESS)
048@BypassInterceptors
049@AutoCreate
050public class SeamAsyncPublisher implements AsyncPublisher {
051    
052    public static final String DESTINATION_NAME = "seamAsync";
053    
054    private Gravity getGravity() {
055        return GravityManager.getGravity(ServletLifecycle.getServletContext());
056    }
057
058    public void initThread() {
059        Gravity gravity = getGravity();
060        if (gravity == null)
061                throw new RuntimeException("Gravity service not configured, it is required for asynchronous event publishing");
062        
063        gravity.initThread(null, null);
064    }
065    
066    public void publishMessage(String sessionId, Object body) {
067        AsyncMessage message = new AsyncMessage();
068        message.setHeader(AsyncMessage.SUBTOPIC_HEADER, "tide.events." + sessionId);
069        message.setDestination(DESTINATION_NAME);
070        message.setBody(body);
071        
072        getGravity().publishMessage(message);
073    }
074}