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.jetty;
022
023 import org.granite.gravity.AbstractChannel;
024 import org.granite.gravity.AsyncHttpContext;
025 import org.granite.gravity.Gravity;
026 import org.granite.gravity.GravityConfig;
027 import org.granite.gravity.MessageReceivingException;
028 import org.granite.logging.Logger;
029 import org.mortbay.util.ajax.Continuation;
030
031 import flex.messaging.messages.AsyncMessage;
032
033 /**
034 * @author William DRAI
035 */
036 public 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.isPending()) {
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 try {
061 if (this.continuation != null)
062 this.continuation.reset();
063 }
064 finally {
065 this.continuation = null;
066 }
067 }
068
069
070 public void resume() {
071 log.debug("Resuming pending continuation %s for client: %s", continuation, getId());
072 try {
073 if (this.continuation != null && this.continuation.isPending())
074 this.continuation.resume();
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 GravityConfig gravityConfig = gravity.getGravityConfig();
087
088 receivedQueueLock.lock();
089 try {
090 if (receivedQueue.size() + 1 > gravityConfig.getMaxMessagesQueuedPerChannel())
091 throw new MessageReceivingException(message, "Could not queue message (channel's queue is full) for channel: " + this);
092
093 receivedQueue.add(message);
094 }
095 finally {
096 receivedQueueLock.unlock();
097 }
098
099 synchronized (this) {
100 resume();
101 }
102 }
103
104 @Override
105 protected boolean hasAsyncHttpContext() {
106 return false;
107 }
108
109 @Override
110 protected void releaseAsyncHttpContext(AsyncHttpContext context) {
111 }
112
113 @Override
114 protected AsyncHttpContext acquireAsyncHttpContext() {
115 return null;
116 }
117
118 public boolean isLocal() {
119 return true;
120 }
121
122 @Override
123 public void destroy() {
124 try {
125 super.destroy();
126 }
127 finally {
128 synchronized (this) {
129 close();
130 }
131 }
132 }
133 }