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ActiveMQ example source code file (SlowConsumerTest.java)

This example ActiveMQ source code file (SlowConsumerTest.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

activemqconnectionfactory, activemqqueue, brokerservice, exception, exception, io, message, message, messages_count, net, network, received, session, string, string, thread, thread

The ActiveMQ SlowConsumerTest.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.bugs;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

import javax.jms.Connection;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;

import junit.framework.TestCase;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.command.ActiveMQQueue;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class SlowConsumerTest extends TestCase {

    private static final Logger LOG = LoggerFactory.getLogger(SlowConsumerTest.class);
    private static final int MESSAGES_COUNT = 10000;

    protected int messageLogFrequency = 2500;
    protected long messageReceiveTimeout = 10000L;

    private Socket stompSocket;
    private ByteArrayOutputStream inputBuffer;
    private int messagesCount;

    /**
     * @param args
     * @throws Exception
     */
    public void testRemoveSubscriber() throws Exception {
        final BrokerService broker = new BrokerService();
        broker.setPersistent(true);
        broker.setUseJmx(true);
        broker.setDeleteAllMessagesOnStartup(true);

        broker.addConnector("tcp://localhost:61616").setName("Default");
        broker.start();
        ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory("tcp://localhost:61616");
        final Connection connection = factory.createConnection();
        connection.start();

        Thread producingThread = new Thread("Producing thread") {
            public void run() {
                try {
                    Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
                    MessageProducer producer = session.createProducer(new ActiveMQQueue(getDestinationName()));
                    for (int idx = 0; idx < MESSAGES_COUNT; ++idx) {
                        Message message = session.createTextMessage("" + idx);
                        producer.send(message);
                        LOG.debug("Sending: " + idx);
                    }
                    producer.close();
                    session.close();
                } catch (Throwable ex) {
                    ex.printStackTrace();
                }
            }
        };
        producingThread.setPriority(Thread.MAX_PRIORITY);
        producingThread.start();
        Thread.sleep(1000);

        Thread consumingThread = new Thread("Consuming thread") {

            public void run() {
                try {
                    Session session = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
                    MessageConsumer consumer = session.createConsumer(new ActiveMQQueue(getDestinationName()));
                    int diff = 0;
                    while (messagesCount != MESSAGES_COUNT) {
                        Message msg = consumer.receive(messageReceiveTimeout);
                        if (msg == null) {
                            LOG.warn("Got null message at count: " + messagesCount + ". Continuing...");
                            break;
                        }
                        String text = ((TextMessage)msg).getText();
                        int currentMsgIdx = Integer.parseInt(text);
                        LOG.debug("Received: " + text + " messageCount: " + messagesCount);
                        msg.acknowledge();
                        if ((messagesCount + diff) != currentMsgIdx) {
                            LOG.debug("Message(s) skipped!! Should be message no.: " + messagesCount + " but got: " + currentMsgIdx);
                            diff = currentMsgIdx - messagesCount;
                        }
                        ++messagesCount;
                        if (messagesCount % messageLogFrequency == 0) {
                            LOG.info("Received: " + messagesCount + " messages so far");
                        }
                        // Thread.sleep(70);
                    }
                } catch (Throwable ex) {
                    ex.printStackTrace();
                }
            }
        };
        consumingThread.start();
        consumingThread.join();

        assertEquals(MESSAGES_COUNT, messagesCount);

    }

    public void sendFrame(String data) throws Exception {
        byte[] bytes = data.getBytes("UTF-8");
        OutputStream outputStream = stompSocket.getOutputStream();
        for (int i = 0; i < bytes.length; i++) {
            outputStream.write(bytes[i]);
        }
        outputStream.flush();
    }

    public String receiveFrame(long timeOut) throws Exception {
        stompSocket.setSoTimeout((int)timeOut);
        InputStream is = stompSocket.getInputStream();
        int c = 0;
        for (;;) {
            c = is.read();
            if (c < 0) {
                throw new IOException("socket closed.");
            } else if (c == 0) {
                c = is.read();
                byte[] ba = inputBuffer.toByteArray();
                inputBuffer.reset();
                return new String(ba, "UTF-8");
            } else {
                inputBuffer.write(c);
            }
        }
    }

    protected String getDestinationName() {
        return getClass().getName() + "." + getName();
    }
}

Other ActiveMQ examples (source code examples)

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