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.gae;
022
023 import org.granite.config.GraniteConfig;
024 import org.granite.config.flex.ServicesConfig;
025 import org.granite.gravity.Channel;
026 import org.granite.gravity.DefaultGravity;
027 import org.granite.gravity.GravityConfig;
028 import org.granite.gravity.Subscription;
029 import org.granite.util.UUIDUtil;
030
031 import com.google.appengine.api.memcache.Expiration;
032 import com.google.appengine.api.memcache.MemcacheService;
033 import com.google.appengine.api.memcache.MemcacheServiceFactory;
034
035 import flex.messaging.messages.Message;
036
037 /**
038 * @author William DRAI
039 * @author Franck WOLFF
040 */
041 public class GAEGravity extends DefaultGravity {
042
043 ///////////////////////////////////////////////////////////////////////////
044 // Fields.
045
046 static final String CHANNEL_PREFIX = "org.granite.gravity.gae.channel.";
047
048 private static MemcacheService gaeCache = MemcacheServiceFactory.getMemcacheService();
049
050 ///////////////////////////////////////////////////////////////////////////
051 // Constructor.
052
053 public GAEGravity(GravityConfig gravityConfig, ServicesConfig servicesConfig, GraniteConfig graniteConfig) {
054 super(gravityConfig, servicesConfig, graniteConfig);
055 }
056
057
058 ///////////////////////////////////////////////////////////////////////////
059 // Channel's operations.
060
061 @Override
062 protected Channel createChannel() {
063 Channel channel = getGravityConfig().getChannelFactory().newChannel(UUIDUtil.randomUUID());
064 Expiration expiration = Expiration.byDeltaMillis((int)getGravityConfig().getChannelIdleTimeoutMillis());
065 gaeCache.put(CHANNEL_PREFIX + channel.getId(), channel, expiration);
066 gaeCache.put(GAEChannel.MSG_COUNT_PREFIX + channel.getId(), 0L, expiration);
067 return channel;
068 }
069
070 @Override
071 public Channel getChannel(String channelId) {
072 if (channelId == null)
073 return null;
074
075 return (Channel)gaeCache.get(CHANNEL_PREFIX + channelId);
076 }
077
078
079 @Override
080 public Channel removeChannel(String channelId) {
081 if (channelId == null)
082 return null;
083
084 Channel channel = (Channel)gaeCache.get(CHANNEL_PREFIX + channelId);
085 if (channel != null) {
086 for (Subscription subscription : channel.getSubscriptions()) {
087 Message message = subscription.getUnsubscribeMessage();
088 handleMessage(message, true);
089 }
090
091 channel.destroy();
092 gaeCache.delete(CHANNEL_PREFIX + channelId);
093 gaeCache.delete(GAEChannel.MSG_COUNT_PREFIX + channelId);
094 }
095
096 return channel;
097 }
098
099 @Override
100 public boolean access(String channelId) {
101 return true;
102 }
103
104
105 @Override
106 public void internalStart() {
107 // Avoid starting thread pool
108 }
109
110
111 @Override
112 protected void postManage(Channel channel) {
113 Expiration expiration = Expiration.byDeltaMillis((int)getGravityConfig().getChannelIdleTimeoutMillis());
114 gaeCache.put(CHANNEL_PREFIX + channel.getId(), channel, expiration);
115 }
116 }