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The ActiveMQ Message Broker and Client implementations
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.activemq.network;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.activemq.command.ConsumerId;
import org.apache.activemq.command.ConsumerInfo;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Represents a network bridge interface
*
* @version $Revision: 1.1 $
*/
public class DemandSubscription {
private static final Log LOG = LogFactory.getLog(DemandSubscription.class);
private final ConsumerInfo remoteInfo;
private final ConsumerInfo localInfo;
private Set remoteSubsIds = new CopyOnWriteArraySet();
private AtomicInteger dispatched = new AtomicInteger(0);
private AtomicBoolean activeWaiter = new AtomicBoolean();
DemandSubscription(ConsumerInfo info) {
remoteInfo = info;
localInfo = info.copy();
localInfo.setNetworkSubscription(true);
remoteSubsIds.add(info.getConsumerId());
}
/**
* Increment the consumers associated with this subscription
*
* @param id
* @return true if added
*/
public boolean add(ConsumerId id) {
return remoteSubsIds.add(id);
}
/**
* Increment the consumers associated with this subscription
*
* @param id
* @return true if removed
*/
public boolean remove(ConsumerId id) {
return remoteSubsIds.remove(id);
}
/**
* @return true if there are no interested consumers
*/
public boolean isEmpty() {
return remoteSubsIds.isEmpty();
}
/**
* @return Returns the localInfo.
*/
public ConsumerInfo getLocalInfo() {
return localInfo;
}
/**
* @return Returns the remoteInfo.
*/
public ConsumerInfo getRemoteInfo() {
return remoteInfo;
}
public void waitForCompletion() {
if (dispatched.get() > 0) {
if (LOG.isDebugEnabled()) {
LOG.debug("Waiting for completion for sub: " + localInfo.getConsumerId() + ", dispatched: " + this.dispatched.get());
}
activeWaiter.set(true);
if (dispatched.get() > 0) {
synchronized (activeWaiter) {
try {
activeWaiter.wait();
} catch (InterruptedException ignored) {
}
}
if (this.dispatched.get() > 0) {
LOG.warn("demand sub interrupted or timedout while waiting for outstanding responses, expect potentially " + this.dispatched.get() + " duplicate deliveried");
}
}
}
}
public void decrementOutstandingResponses() {
if (dispatched.decrementAndGet() == 0 && activeWaiter.get()) {
synchronized (activeWaiter) {
activeWaiter.notifyAll();
}
}
}
public boolean incrementOutstandingResponses() {
dispatched.incrementAndGet();
if (activeWaiter.get()) {
decrementOutstandingResponses();
return false;
}
return true;
}
}