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.gravity.jetty8;
023
024import org.eclipse.jetty.continuation.Continuation;
025import org.granite.gravity.AbstractChannel;
026import org.granite.gravity.AsyncHttpContext;
027import org.granite.gravity.Gravity;
028import org.granite.gravity.GravityConfig;
029import org.granite.gravity.MessageReceivingException;
030import org.granite.logging.Logger;
031
032import flex.messaging.messages.AsyncMessage;
033
034/**
035 * @author William DRAI
036 */
037public class ContinuationChannel extends AbstractChannel {
038
039    private static final Logger log = Logger.getLogger(ContinuationChannel.class);
040
041    private Continuation continuation = null;
042
043    public ContinuationChannel(Gravity gravity, String id, ContinuationChannelFactory factory, String clientType) {
044        super(gravity, id, factory, clientType);
045    }
046
047    public void setContinuation(Continuation continuation) {
048        log.debug("Setting continuation %s for client: %s", continuation, getId());
049        try {
050            if (this.continuation != null && this.continuation.isSuspended()) {
051                log.debug("Resuming previous continuation %s for client: %s", this.continuation, getId());
052                this.continuation.resume();
053            }
054        }
055        finally {
056            this.continuation = continuation;
057        }
058    }
059    
060    public void close() {
061        this.continuation = null;
062//      try {
063//            if (this.continuation != null)
064//                this.continuation.
065//        }
066//      finally {
067//            this.continuation = null;
068//      }
069    }
070    
071
072    public void resume() {
073        log.debug("Resuming pending continuation %s for client: %s", continuation, getId());
074        try {
075            if (this.continuation != null && this.continuation.isSuspended())
076                this.continuation.resume();
077        }
078        finally {
079            this.continuation = null;
080        }
081    }
082    
083    @Override
084        public void receive(AsyncMessage message) throws MessageReceivingException {
085                if (message == null)
086                        throw new NullPointerException("message cannot be null");
087
088                GravityConfig gravityConfig = gravity.getGravityConfig();
089                
090                receivedQueueLock.lock();
091                try {
092                        if (receivedQueue.size() + 1 > gravityConfig.getMaxMessagesQueuedPerChannel())
093                                throw new MessageReceivingException(message, "Could not queue message (channel's queue is full) for channel: " + this);
094                        
095                        receivedQueue.add(message);
096                }
097                finally {
098                        receivedQueueLock.unlock();
099                }
100                
101                synchronized (this) {
102                        resume();
103                }
104        }
105
106        @Override
107        protected boolean hasAsyncHttpContext() {
108                return false;
109        }
110
111        @Override
112        protected void releaseAsyncHttpContext(AsyncHttpContext context) {
113        }
114
115        @Override
116        protected AsyncHttpContext acquireAsyncHttpContext() {
117        return null;
118    }
119
120    public boolean isLocal() {
121        return true;
122    }
123
124        @Override
125        public void destroy() {
126                try {
127                        super.destroy();
128                }
129                finally {
130                        synchronized (this) {
131                                close();
132                        }
133                }
134        }
135}