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ActiveMQ example source code file (ConsumerTool.java)

This example ActiveMQ source code file (ConsumerTool.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

connection, consumertool, consumertool, io, ioexception, jmsexception, message, messageconsumer, messageconsumer, messagelistener, session, session, string, textmessage, textmessage

The ActiveMQ ConsumerTool.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.io.IOException;

import javax.jms.Connection;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.Topic;

/**
 * A simple tool for consuming messages
 * 
 * 
 */
public class ConsumerTool extends ToolSupport implements MessageListener {

    protected int count;
    protected int dumpCount = 10;
    protected boolean verbose = true;
    protected int maxiumMessages;
    private boolean pauseBeforeShutdown;

    public static void main(String[] args) {
        ConsumerTool tool = new ConsumerTool();
        if (args.length > 0) {
            tool.url = args[0];
        }
        if (args.length > 1) {
            tool.topic = args[1].equalsIgnoreCase("true");
        }
        if (args.length > 2) {
            tool.subject = args[2];
        }
        if (args.length > 3) {
            tool.durable = args[3].equalsIgnoreCase("true");
        }
        if (args.length > 4) {
            tool.maxiumMessages = Integer.parseInt(args[4]);
        }
        tool.run();
    }

    public void run() {
        try {
            System.out.println("Connecting to URL: " + url);
            System.out.println("Consuming " + (topic ? "topic" : "queue") + ": " + subject);
            System.out.println("Using " + (durable ? "durable" : "non-durable") + " subscription");

            Connection connection = createConnection();
            Session session = createSession(connection);
            MessageConsumer consumer = null;
            if (durable && topic) {
                consumer = session.createDurableSubscriber((Topic)destination, consumerName);
            } else {
                consumer = session.createConsumer(destination);
            }
            if (maxiumMessages <= 0) {
                consumer.setMessageListener(this);
            }
            connection.start();

            if (maxiumMessages > 0) {
                consumeMessagesAndClose(connection, session, consumer);
            }
        } catch (Exception e) {
            System.out.println("Caught: " + e);
            e.printStackTrace();
        }
    }

    public void onMessage(Message message) {
        try {
            if (message instanceof TextMessage) {
                TextMessage txtMsg = (TextMessage)message;
                if (verbose) {

                    String msg = txtMsg.getText();
                    if (msg.length() > 50) {
                        msg = msg.substring(0, 50) + "...";
                    }

                    System.out.println("Received: " + msg);
                }
            } else {
                if (verbose) {
                    System.out.println("Received: " + message);
                }
            }
            /*
             * if (++count % dumpCount == 0) { dumpStats(connection); }
             */
        } catch (JMSException e) {
            System.out.println("Caught: " + e);
            e.printStackTrace();
        }
    }

    protected void consumeMessagesAndClose(Connection connection, Session session, MessageConsumer consumer) throws JMSException, IOException {
        System.out.println("We are about to wait until we consume: " + maxiumMessages + " message(s) then we will shutdown");

        for (int i = 0; i < maxiumMessages; i++) {
            Message message = consumer.receive();
            onMessage(message);
        }
        System.out.println("Closing connection");
        consumer.close();
        session.close();
        connection.close();
        if (pauseBeforeShutdown) {
            System.out.println("Press return to shut down");
            System.in.read();
        }
    }
}

Other ActiveMQ examples (source code examples)

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

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