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ActiveMQ example source code file (UdpTestSupport.java)

This example ActiveMQ source code file (UdpTestSupport.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

activemqtextmessage, activemqtextmessage, caught, command, command, consumerinfo, exception, exception, io, received, should, string, transport, transport, transportlistener

The ActiveMQ UdpTestSupport.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.transport.udp;

import java.io.IOException;

import javax.jms.MessageNotWriteableException;

import junit.framework.TestCase;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.ActiveMQQueue;
import org.apache.activemq.command.ActiveMQTextMessage;
import org.apache.activemq.command.Command;
import org.apache.activemq.command.ConsumerInfo;
import org.apache.activemq.command.ProducerInfo;
import org.apache.activemq.command.Response;
import org.apache.activemq.command.WireFormatInfo;
import org.apache.activemq.transport.Transport;
import org.apache.activemq.transport.TransportAcceptListener;
import org.apache.activemq.transport.TransportListener;
import org.apache.activemq.transport.TransportServer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 
 */
public abstract class UdpTestSupport extends TestCase implements TransportListener {

    private static final Logger LOG = LoggerFactory.getLogger(UdpTestSupport.class);

    protected Transport producer;
    protected Transport consumer;

    protected Object lock = new Object();
    protected Command receivedCommand;
    protected TransportServer server;
    protected boolean large;

    // You might want to set this to massive number if debugging
    protected int waitForCommandTimeout = 40000;

    public void testSendingSmallMessage() throws Exception {
        ConsumerInfo expected = new ConsumerInfo();
        expected.setSelector("Cheese");
        expected.setExclusive(true);
        expected.setExclusive(true);
        expected.setPrefetchSize(3456);

        try {
            LOG.info("About to send: " + expected);
            producer.oneway(expected);

            Command received = assertCommandReceived();
            assertTrue("Should have received a ConsumerInfo but was: " + received, received instanceof ConsumerInfo);
            ConsumerInfo actual = (ConsumerInfo)received;
            assertEquals("Selector", expected.getSelector(), actual.getSelector());
            assertEquals("isExclusive", expected.isExclusive(), actual.isExclusive());
            assertEquals("getPrefetchSize", expected.getPrefetchSize(), actual.getPrefetchSize());
        } catch (Exception e) {
            LOG.info("Caught: " + e);
            e.printStackTrace();
            fail("Failed to send to transport: " + e);
        }
    }

    public void testSendingMediumMessage() throws Exception {
        String text = createMessageBodyText(4 * 105);
        ActiveMQDestination destination = new ActiveMQQueue("Foo.Bar.Medium");
        assertSendTextMessage(destination, text);
    }

    public void testSendingLargeMessage() throws Exception {
        String text = createMessageBodyText(4 * 1024);
        ActiveMQDestination destination = new ActiveMQQueue("Foo.Bar.Large");
        assertSendTextMessage(destination, text);
    }

    protected void assertSendTextMessage(ActiveMQDestination destination, String text) throws MessageNotWriteableException {
        large = true;

        ActiveMQTextMessage expected = new ActiveMQTextMessage();

        expected.setText(text);
        expected.setDestination(destination);

        try {
            LOG.info("About to send message of type: " + expected.getClass());
            producer.oneway(expected);

            // lets send a dummy command to ensure things don't block if we
            // discard the last one
            // keepalive does not have a commandId...
            // producer.oneway(new KeepAliveInfo());
            producer.oneway(new ProducerInfo());
            producer.oneway(new ProducerInfo());

            Command received = assertCommandReceived();
            assertTrue("Should have received a ActiveMQTextMessage but was: " + received, received instanceof ActiveMQTextMessage);
            ActiveMQTextMessage actual = (ActiveMQTextMessage)received;

            assertEquals("getDestination", expected.getDestination(), actual.getDestination());
            assertEquals("getText", expected.getText(), actual.getText());

            LOG.info("Received text message with: " + actual.getText().length() + " character(s)");
        } catch (Exception e) {
            LOG.info("Caught: " + e);
            e.printStackTrace();
            fail("Failed to send to transport: " + e);
        }
    }

    protected String createMessageBodyText(int loopSize) {
        StringBuffer buffer = new StringBuffer();
        for (int i = 0; i < loopSize; i++) {
            buffer.append("0123456789");
        }
        return buffer.toString();
    }

    protected void setUp() throws Exception {
        server = createServer();
        if (server != null) {
            server.setAcceptListener(new TransportAcceptListener() {

                public void onAccept(Transport transport) {
                    consumer = transport;
                    consumer.setTransportListener(UdpTestSupport.this);
                    try {
                        consumer.start();
                    } catch (Exception e) {
                        throw new RuntimeException(e);
                    }
                }

                public void onAcceptError(Exception error) {
                }
            });
            server.start();
        }

        consumer = createConsumer();
        if (consumer != null) {
            consumer.setTransportListener(this);
            consumer.start();
        }

        producer = createProducer();
        producer.setTransportListener(new TransportListener() {
            public void onCommand(Object command) {
                LOG.info("Producer received: " + command);
            }

            public void onException(IOException error) {
                LOG.info("Producer exception: " + error);
                error.printStackTrace();
            }

            public void transportInterupted() {
            }

            public void transportResumed() {
            }
        });

        producer.start();
    }

    protected void tearDown() throws Exception {
        if (producer != null) {
            producer.stop();
        }
        if (consumer != null) {
            consumer.stop();
        }
        if (server != null) {
            server.stop();
        }
    }

    public void onCommand(Object o) {
        final Command command = (Command)o;
        if (command instanceof WireFormatInfo) {
            LOG.info("Got WireFormatInfo: " + command);
        } else {
            if (command.isResponseRequired()) {
                // lets send a response back...
                sendResponse(command);

            }
            if (large) {
                LOG.info("### Received command: " + command.getClass() + " with id: " + command.getCommandId());
            } else {
                LOG.info("### Received command: " + command);
            }

            synchronized (lock) {
                if (receivedCommand == null) {
                    receivedCommand = command;
                } else {
                    LOG.info("Ignoring superfluous command: " + command);
                }
                lock.notifyAll();
            }
        }
    }

    protected void sendResponse(Command command) {
        Response response = new Response();
        response.setCorrelationId(command.getCommandId());
        try {
            consumer.oneway(response);
        } catch (IOException e) {
            LOG.info("Caught: " + e);
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }

    public void onException(IOException error) {
        LOG.info("### Received error: " + error);
        error.printStackTrace();
    }

    public void transportInterupted() {
        LOG.info("### Transport interrupted");
    }

    public void transportResumed() {
        LOG.info("### Transport resumed");
    }

    protected Command assertCommandReceived() throws InterruptedException {
        Command answer = null;
        synchronized (lock) {
            answer = receivedCommand;
            if (answer == null) {
                lock.wait(waitForCommandTimeout);
            }
            answer = receivedCommand;
        }

        assertNotNull("Should have received a Command by now!", answer);
        return answer;
    }

    protected abstract Transport createConsumer() throws Exception;

    protected abstract Transport createProducer() throws Exception;

    protected TransportServer createServer() throws Exception {
        return null;
    }

}

Other ActiveMQ examples (source code examples)

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

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