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ActiveMQ example source code file (TransportStatusDetector.java)

This example ActiveMQ source code file (TransportStatusDetector.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - ActiveMQ tags/keywords

activemq, atomicboolean, atomicboolean, copyonwritearrayset, exception, exception, iterator, iterator, logger, status, thread, threading, threads, transportconnection, transportconnection, transportstatusdetector, util

The ActiveMQ TransportStatusDetector.java source code

/**
 * 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.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Used to provide information on the status of the Connection
 * 
 * 
 */
public class TransportStatusDetector implements Service, Runnable {
    private static final Logger LOG = LoggerFactory.getLogger(TransportStatusDetector.class);
    private TransportConnector connector;
    private Set<TransportConnection> 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<TransportConnection> 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);
        }
    }
}

Other ActiveMQ examples (source code examples)

Here is a short list of links related to this ActiveMQ TransportStatusDetector.java source code file:

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