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    
021    package org.granite.gravity.generic;
022    
023    import javax.servlet.ServletConfig;
024    
025    import org.granite.gravity.AbstractChannel;
026    import org.granite.gravity.AsyncHttpContext;
027    import org.granite.gravity.GravityConfig;
028    import org.granite.gravity.MessageReceivingException;
029    import org.granite.logging.Logger;
030    
031    import flex.messaging.messages.AsyncMessage;
032    
033    /**
034     * @author William DRAI
035     */
036    public class GenericChannel extends AbstractChannel {
037    
038        private static final Logger log = Logger.getLogger(GenericChannel.class);
039    
040        private WaitingContinuation continuation = null;
041    
042        public GenericChannel(ServletConfig servletConfig, GravityConfig gravityConfig, String id) {
043            super(servletConfig, gravityConfig, id);
044        }
045    
046        public void setContinuation(WaitingContinuation continuation) {
047            try {
048                if (this.continuation != null && this.continuation.isPending()) {
049                    log.debug("Set pending continuation for client: %s", getId());
050                    this.continuation.resume();
051                }
052            }
053            finally {
054                this.continuation = continuation;
055            }
056        }
057        
058        public void reset() {
059            try {
060                if (this.continuation != null)
061                    this.continuation.reset();
062            }
063            finally {
064                this.continuation = null;
065            }
066        }
067        
068    
069        public void resume() {
070            try {
071                if (this.continuation != null) {
072                    log.debug("Resume pending continuation for client: %s", getId());
073                    this.continuation.resume();
074                }
075            }
076            finally {
077                this.continuation = null;
078            }
079        }
080        
081        @Override
082            public void receive(AsyncMessage message) throws MessageReceivingException {
083                    if (message == null)
084                            throw new NullPointerException("message cannot be null");
085                    
086                    receivedQueueLock.lock();
087                    try {
088                            receivedQueue.add(message);
089                    }
090                    catch (Exception e) {
091                            throw new MessageReceivingException(message, "Could not queue message", e);
092                    }
093                    finally {
094                            receivedQueueLock.unlock();
095                    }
096                    
097                    synchronized (this) {
098                            resume();
099                    }
100            }
101    
102            @Override
103            protected boolean hasAsyncHttpContext() {
104                    return false;
105            }
106    
107            @Override
108            protected void releaseAsyncHttpContext(AsyncHttpContext context) {
109            }
110    
111            @Override
112            protected AsyncHttpContext acquireAsyncHttpContext() {
113            return null;
114        }
115    
116        public boolean isLocal() {
117            return true;
118        }
119    
120            @Override
121            public void destroy() {
122                    try {
123                            super.destroy();
124                    }
125                    finally {
126                            synchronized (this) {
127                                    reset();
128                            }
129                    }
130            }
131    }