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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.broker;
import java.util.Iterator;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.activemq.Service;
import org.apache.activemq.ThreadPriorities;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Used to provide information on the status of the Connection
*
* @version $Revision: 1.5 $
*/
public class TransportStatusDetector implements Service, Runnable {
private static final Log LOG = LogFactory.getLog(TransportStatusDetector.class);
private TransportConnector connector;
private Set collectionCandidates = new CopyOnWriteArraySet();
private AtomicBoolean started = new AtomicBoolean(false);
private Thread runner;
private int sweepInterval = 5000;
TransportStatusDetector(TransportConnector connector) {
this.connector = connector;
}
/**
* @return Returns the sweepInterval.
*/
public int getSweepInterval() {
return sweepInterval;
}
/**
* The sweepInterval to set.
*
* @param sweepInterval
*/
public void setSweepInterval(int sweepInterval) {
this.sweepInterval = sweepInterval;
}
protected void doCollection() {
for (Iterator i = collectionCandidates.iterator(); i.hasNext();) {
TransportConnection tc = i.next();
if (tc.isMarkedCandidate()) {
if (tc.isBlockedCandidate()) {
collectionCandidates.remove(tc);
doCollection(tc);
} else {
tc.doMark();
}
} else {
collectionCandidates.remove(tc);
}
}
}
protected void doSweep() {
for (Iterator i = connector.getConnections().iterator(); i.hasNext();) {
TransportConnection connection = (TransportConnection)i.next();
if (connection.isMarkedCandidate()) {
connection.doMark();
collectionCandidates.add(connection);
}
}
}
protected void doCollection(TransportConnection tc) {
LOG.warn("found a blocked client - stopping: " + tc);
try {
tc.stop();
} catch (Exception e) {
LOG.error("Error stopping " + tc, e);
}
}
public void run() {
while (started.get()) {
try {
doCollection();
doSweep();
Thread.sleep(sweepInterval);
} catch (Throwable e) {
LOG.error("failed to complete a sweep for blocked clients", e);
}
}
}
public void start() throws Exception {
if (started.compareAndSet(false, true)) {
runner = new Thread(this, "ActiveMQ Transport Status Monitor: " + connector);
runner.setDaemon(true);
runner.setPriority(ThreadPriorities.BROKER_MANAGEMENT);
runner.start();
}
}
public void stop() throws Exception {
started.set(false);
if (runner != null) {
runner.join(getSweepInterval() * 5);
}
}
}