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.gravity.jetty8;
022
023import org.eclipse.jetty.continuation.Continuation;
024import org.granite.gravity.AbstractChannel;
025import org.granite.gravity.AsyncHttpContext;
026import org.granite.gravity.Gravity;
027import org.granite.gravity.GravityConfig;
028import org.granite.gravity.MessageReceivingException;
029import org.granite.logging.Logger;
030
031import flex.messaging.messages.AsyncMessage;
032
033/**
034 * @author William DRAI
035 */
036public class ContinuationChannel extends AbstractChannel {
037
038    private static final Logger log = Logger.getLogger(ContinuationChannel.class);
039
040    private Continuation continuation = null;
041
042    public ContinuationChannel(Gravity gravity, String id, ContinuationChannelFactory factory, String clientType) {
043        super(gravity, id, factory, clientType);
044    }
045
046    public void setContinuation(Continuation continuation) {
047        log.debug("Setting continuation %s for client: %s", continuation, getId());
048        try {
049            if (this.continuation != null && this.continuation.isSuspended()) {
050                log.debug("Resuming previous continuation %s for client: %s", this.continuation, getId());
051                this.continuation.resume();
052            }
053        }
054        finally {
055            this.continuation = continuation;
056        }
057    }
058    
059    public void close() {
060        this.continuation = null;
061//      try {
062//            if (this.continuation != null)
063//                this.continuation.
064//        }
065//      finally {
066//            this.continuation = null;
067//      }
068    }
069    
070
071    public void resume() {
072        log.debug("Resuming pending continuation %s for client: %s", continuation, getId());
073        try {
074            if (this.continuation != null && this.continuation.isSuspended())
075                this.continuation.resume();
076        }
077        finally {
078            this.continuation = null;
079        }
080    }
081    
082    @Override
083        public void receive(AsyncMessage message) throws MessageReceivingException {
084                if (message == null)
085                        throw new NullPointerException("message cannot be null");
086
087                GravityConfig gravityConfig = gravity.getGravityConfig();
088                
089                receivedQueueLock.lock();
090                try {
091                        if (receivedQueue.size() + 1 > gravityConfig.getMaxMessagesQueuedPerChannel())
092                                throw new MessageReceivingException(message, "Could not queue message (channel's queue is full) for channel: " + this);
093                        
094                        receivedQueue.add(message);
095                }
096                finally {
097                        receivedQueueLock.unlock();
098                }
099                
100                synchronized (this) {
101                        resume();
102                }
103        }
104
105        @Override
106        protected boolean hasAsyncHttpContext() {
107                return false;
108        }
109
110        @Override
111        protected void releaseAsyncHttpContext(AsyncHttpContext context) {
112        }
113
114        @Override
115        protected AsyncHttpContext acquireAsyncHttpContext() {
116        return null;
117    }
118
119    public boolean isLocal() {
120        return true;
121    }
122
123        @Override
124        public void destroy() {
125                try {
126                        super.destroy();
127                }
128                finally {
129                        synchronized (this) {
130                                close();
131                        }
132                }
133        }
134}