ActiveMQ example source code file (JmsConsumerClient.java)

This example ActiveMQ source code file (JmsConsumerClient.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

atomicinteger, creating, jmsconsumerclient, jmsconsumerproperties, jmsexception, jmsexception, messageconsumer, messageconsumer, messagelistener, starting, starting, string, unsubscribing, unsubscribing

The ActiveMQ JmsConsumerClient.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.tool;

import java.util.concurrent.atomic.AtomicInteger;

import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.Topic;

import org.apache.activemq.tool.properties.JmsClientProperties;
import org.apache.activemq.tool.properties.JmsConsumerProperties;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class JmsConsumerClient extends AbstractJmsMeasurableClient {
    private static final Logger LOG = LoggerFactory.getLogger(JmsConsumerClient.class);

    protected MessageConsumer jmsConsumer;
    protected JmsConsumerProperties client;

    public JmsConsumerClient(ConnectionFactory factory) {
        this(new JmsConsumerProperties(), factory);
    }

    public JmsConsumerClient(JmsConsumerProperties clientProps, ConnectionFactory factory) {
        super(factory);
        client = clientProps;
    }

    public void receiveMessages() throws JMSException {
        if (client.isAsyncRecv()) {
            if (client.getRecvType().equalsIgnoreCase(JmsConsumerProperties.TIME_BASED_RECEIVING)) {
                receiveAsyncTimeBasedMessages(client.getRecvDuration());
            } else {
                receiveAsyncCountBasedMessages(client.getRecvCount());
            }
        } else {
            if (client.getRecvType().equalsIgnoreCase(JmsConsumerProperties.TIME_BASED_RECEIVING)) {
                receiveSyncTimeBasedMessages(client.getRecvDuration());
            } else {
                receiveSyncCountBasedMessages(client.getRecvCount());
            }
        }
    }

    public void receiveMessages(int destCount) throws JMSException {
        this.destCount = destCount;
        receiveMessages();
    }

    public void receiveMessages(int destIndex, int destCount) throws JMSException {
        this.destIndex = destIndex;
        receiveMessages(destCount);
    }

    public void receiveSyncTimeBasedMessages(long duration) throws JMSException {
        if (getJmsConsumer() == null) {
            createJmsConsumer();
        }

        try {
            getConnection().start();

            LOG.info("Starting to synchronously receive messages for " + duration + " ms...");
            long endTime = System.currentTimeMillis() + duration;
            while (System.currentTimeMillis() < endTime) {
                getJmsConsumer().receive();
                incThroughput();
                sleep();
            }
        } finally {
            if (client.isDurable() && client.isUnsubscribe()) {
                LOG.info("Unsubscribing durable subscriber: " + getClientName());
                getJmsConsumer().close();
                getSession().unsubscribe(getClientName());
            }
            getConnection().close();
        }
    }

    public void receiveSyncCountBasedMessages(long count) throws JMSException {
        if (getJmsConsumer() == null) {
            createJmsConsumer();
        }

        try {
            getConnection().start();
            LOG.info("Starting to synchronously receive " + count + " messages...");

            int recvCount = 0;
            while (recvCount < count) {
                getJmsConsumer().receive();
                incThroughput();
                recvCount++;
                sleep();
            }
        } finally {
            if (client.isDurable() && client.isUnsubscribe()) {
                LOG.info("Unsubscribing durable subscriber: " + getClientName());
                getJmsConsumer().close();
                getSession().unsubscribe(getClientName());
            }
            getConnection().close();
        }
    }

    public void receiveAsyncTimeBasedMessages(long duration) throws JMSException {
        if (getJmsConsumer() == null) {
            createJmsConsumer();
        }

        getJmsConsumer().setMessageListener(new MessageListener() {
            public void onMessage(Message msg) {
                incThroughput();
                sleep();
            }
        });

        try {
            getConnection().start();
            LOG.info("Starting to asynchronously receive messages for " + duration + " ms...");
            try {
                Thread.sleep(duration);
            } catch (InterruptedException e) {
                throw new JMSException("JMS consumer thread sleep has been interrupted. Message: " + e.getMessage());
            }
        } finally {
            if (client.isDurable() && client.isUnsubscribe()) {
                LOG.info("Unsubscribing durable subscriber: " + getClientName());
                getJmsConsumer().close();
                getSession().unsubscribe(getClientName());
            }
            getConnection().close();
        }
    }

    public void receiveAsyncCountBasedMessages(long count) throws JMSException {
        if (getJmsConsumer() == null) {
            createJmsConsumer();
        }

        final AtomicInteger recvCount = new AtomicInteger(0);
        getJmsConsumer().setMessageListener(new MessageListener() {
            public void onMessage(Message msg) {
                incThroughput();
                recvCount.incrementAndGet();
                synchronized (recvCount) {
                    recvCount.notify();
                }
            }
        });

        try {
            getConnection().start();
            LOG.info("Starting to asynchronously receive " + client.getRecvCount() + " messages...");
            try {
                while (recvCount.get() < count) {
                    synchronized (recvCount) {
                        recvCount.wait();
                    }
                }
            } catch (InterruptedException e) {
                throw new JMSException("JMS consumer thread wait has been interrupted. Message: " + e.getMessage());
            }
        } finally {
            if (client.isDurable() && client.isUnsubscribe()) {
                LOG.info("Unsubscribing durable subscriber: " + getClientName());
                getJmsConsumer().close();
                getSession().unsubscribe(getClientName());
            }
            getConnection().close();
        }
    }

    public MessageConsumer createJmsConsumer() throws JMSException {
        Destination[] dest = createDestination(destIndex, destCount);
        return createJmsConsumer(dest[0]);
    }

    public MessageConsumer createJmsConsumer(Destination dest) throws JMSException {
        if (client.isDurable()) {
            String clientName = getClientName();
            if (clientName == null) {
                clientName = "JmsConsumer";
                setClientName(clientName);
            }
            LOG.info("Creating durable subscriber (" + clientName + ") to: " + dest.toString());
            jmsConsumer = getSession().createDurableSubscriber((Topic) dest, clientName);
        } else {
            LOG.info("Creating non-durable consumer to: " + dest.toString());
            jmsConsumer = getSession().createConsumer(dest);
        }
        return jmsConsumer;
    }

    public MessageConsumer createJmsConsumer(Destination dest, String selector, boolean noLocal) throws JMSException {
        if (client.isDurable()) {
            String clientName = getClientName();
            if (clientName == null) {
                clientName = "JmsConsumer";
                setClientName(clientName);
            }
            LOG.info("Creating durable subscriber (" + clientName + ") to: " + dest.toString());
            jmsConsumer = getSession().createDurableSubscriber((Topic) dest, clientName, selector, noLocal);
        } else {
            LOG.info("Creating non-durable consumer to: " + dest.toString());
            jmsConsumer = getSession().createConsumer(dest, selector, noLocal);
        }
        return jmsConsumer;
    }

    public MessageConsumer getJmsConsumer() {
        return jmsConsumer;
    }

    public JmsClientProperties getClient() {
        return client;
    }

    public void setClient(JmsClientProperties clientProps) {
        client = (JmsConsumerProperties)clientProps;
    }
    
    protected void sleep() {
        if (client.getRecvDelay() > 0) {
        	try {
        		LOG.trace("Sleeping for " + client.getRecvDelay() + " milliseconds");
        		Thread.sleep(client.getRecvDelay());
        	} catch (java.lang.InterruptedException ex) {
        		LOG.warn(ex.getMessage());
        	}
        }
    }
}