001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.activemq.network;
018    
019    import java.util.Set;
020    import java.util.concurrent.CopyOnWriteArraySet;
021    import java.util.concurrent.TimeUnit;
022    import java.util.concurrent.atomic.AtomicBoolean;
023    import java.util.concurrent.atomic.AtomicInteger;
024    
025    import org.apache.activemq.command.ConsumerId;
026    import org.apache.activemq.command.ConsumerInfo;
027    import org.apache.activemq.command.NetworkBridgeFilter;
028    import org.apache.activemq.command.SubscriptionInfo;
029    import org.slf4j.Logger;
030    import org.slf4j.LoggerFactory;
031    
032    /**
033     * Represents a network bridge interface
034     */
035    public class DemandSubscription {
036        private static final Logger LOG = LoggerFactory.getLogger(DemandSubscription.class);
037    
038        private final ConsumerInfo remoteInfo;
039        private final ConsumerInfo localInfo;
040        private final Set<ConsumerId> remoteSubsIds = new CopyOnWriteArraySet<ConsumerId>();
041        private final AtomicInteger dispatched = new AtomicInteger(0);
042        private final AtomicBoolean activeWaiter = new AtomicBoolean();
043        private final Set<SubscriptionInfo> durableRemoteSubs = new CopyOnWriteArraySet<SubscriptionInfo>();
044        private SubscriptionInfo localDurableSubscriber;
045    
046        private NetworkBridgeFilter networkBridgeFilter;
047        private boolean staticallyIncluded;
048    
049        DemandSubscription(ConsumerInfo info) {
050            remoteInfo = info;
051            localInfo = info.copy();
052            localInfo.setNetworkSubscription(true);
053            remoteSubsIds.add(info.getConsumerId());
054        }
055    
056        @Override
057        public String toString() {
058            return "DemandSub{" + localInfo.getConsumerId() + ",remotes:" + remoteSubsIds + "}";
059        }
060    
061        /**
062         * Increment the consumers associated with this subscription
063         *
064         * @param id
065         * @return true if added
066         */
067        public boolean add(ConsumerId id) {
068            return remoteSubsIds.add(id);
069        }
070    
071        /**
072         * Increment the consumers associated with this subscription
073         *
074         * @param id
075         * @return true if removed
076         */
077        public boolean remove(ConsumerId id) {
078            return remoteSubsIds.remove(id);
079        }
080    
081        public Set<SubscriptionInfo> getDurableRemoteSubs() {
082            return durableRemoteSubs;
083        }
084    
085        /**
086         * @return true if there are no interested consumers
087         */
088        public boolean isEmpty() {
089            return remoteSubsIds.isEmpty();
090        }
091    
092        public int size() {
093            return remoteSubsIds.size();
094        }
095        /**
096         * @return Returns the localInfo.
097         */
098        public ConsumerInfo getLocalInfo() {
099            return localInfo;
100        }
101    
102        /**
103         * @return Returns the remoteInfo.
104         */
105        public ConsumerInfo getRemoteInfo() {
106            return remoteInfo;
107        }
108    
109        public void waitForCompletion() {
110            if (dispatched.get() > 0) {
111                LOG.debug("Waiting for completion for sub: {}, dispatched: {}", localInfo.getConsumerId(), this.dispatched.get());
112                activeWaiter.set(true);
113                if (dispatched.get() > 0) {
114                    synchronized (activeWaiter) {
115                        try {
116                            activeWaiter.wait(TimeUnit.SECONDS.toMillis(30));
117                        } catch (InterruptedException ignored) {
118                        }
119                    }
120                    if (this.dispatched.get() > 0) {
121                        LOG.warn("demand sub interrupted or timedout while waiting for outstanding responses, expect potentially {} duplicate forwards", this.dispatched.get());
122                    }
123                }
124            }
125        }
126    
127        public void decrementOutstandingResponses() {
128            if (dispatched.decrementAndGet() == 0 && activeWaiter.get()) {
129                synchronized (activeWaiter) {
130                    activeWaiter.notifyAll();
131                }
132            }
133        }
134    
135        public boolean incrementOutstandingResponses() {
136            dispatched.incrementAndGet();
137            if (activeWaiter.get()) {
138                decrementOutstandingResponses();
139                return false;
140            }
141            return true;
142        }
143    
144        public NetworkBridgeFilter getNetworkBridgeFilter() {
145            return networkBridgeFilter;
146        }
147    
148        public void setNetworkBridgeFilter(NetworkBridgeFilter networkBridgeFilter) {
149            this.networkBridgeFilter = networkBridgeFilter;
150        }
151    
152        public SubscriptionInfo getLocalDurableSubscriber() {
153            return localDurableSubscriber;
154        }
155    
156        public void setLocalDurableSubscriber(SubscriptionInfo localDurableSubscriber) {
157            this.localDurableSubscriber = localDurableSubscriber;
158        }
159    
160        public boolean isStaticallyIncluded() {
161            return staticallyIncluded;
162        }
163    
164        public void setStaticallyIncluded(boolean staticallyIncluded) {
165            this.staticallyIncluded = staticallyIncluded;
166        }
167    }