ActiveMQ example source code file (StompSubscriptionRemoveTest.java)

This example ActiveMQ source code file (StompSubscriptionRemoveTest.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

brokerservice, command_message, command_message, connect\n, disconnect\n\n, header_message_id, header_message_id, io, ioexception, net, network, received, stomp_port, stomp_port, stompconnection, string, string

The ActiveMQ StompSubscriptionRemoveTest.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.stomp;

import java.io.ByteArrayInputStream;
import java.io.DataInput;
import java.io.DataInputStream;
import java.io.IOException;
import java.net.Socket;

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

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 StompSubscriptionRemoveTest extends TestCase {
    private static final Logger LOG = LoggerFactory.getLogger(StompSubscriptionRemoveTest.class);
    private static final String COMMAND_MESSAGE = "MESSAGE";
    private static final String HEADER_MESSAGE_ID = "message-id";
    private static final int STOMP_PORT = 61613;

    private StompConnection stompConnection = new StompConnection();

    public void testRemoveSubscriber() throws Exception {
        BrokerService broker = new BrokerService();
        broker.setPersistent(false);

        broker.addConnector("stomp://localhost:61613").setName("Stomp");
        broker.addConnector("tcp://localhost:61616").setName("Default");
        broker.start();

        ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory("tcp://localhost:61616");
        Connection connection = factory.createConnection();
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        MessageProducer producer = session.createProducer(new ActiveMQQueue(getDestinationName()));
        Message message = session.createTextMessage("Testas");
        for (int idx = 0; idx < 2000; ++idx) {
            producer.send(message);
            LOG.debug("Sending: " + idx);
        }
        producer.close();
        session.close();
        connection.close();

        stompConnection.open(new Socket("localhost", STOMP_PORT));

        String connectFrame = "CONNECT\n" + "login: brianm\n" + "passcode: wombats\n" + "\n";
        stompConnection.sendFrame(connectFrame);

        stompConnection.receiveFrame();
        String frame = "SUBSCRIBE\n" + "destination:/queue/" + getDestinationName() + "\n" + "ack:client\n\n";
        stompConnection.sendFrame(frame);

        int messagesCount = 0;
        int count = 0;
        while (count < 2) {
            String receiveFrame = stompConnection.receiveFrame();
            LOG.debug("Received: " + receiveFrame);
            assertEquals("Unexpected frame received", COMMAND_MESSAGE, getCommand(receiveFrame));
            String messageId = getHeaderValue(receiveFrame, HEADER_MESSAGE_ID);
            String ackmessage = "ACK\n" + HEADER_MESSAGE_ID + ":" + messageId + "\n\n";
            stompConnection.sendFrame(ackmessage);
            // Thread.sleep(1000);
            ++messagesCount;
            ++count;
        }

        stompConnection.sendFrame("DISCONNECT\n\n");
        Thread.sleep(1000);
        stompConnection.close();

        stompConnection.open(new Socket("localhost", STOMP_PORT));

        connectFrame = "CONNECT\n" + "login: brianm\n" + "passcode: wombats\n" + "\n";
        stompConnection.sendFrame(connectFrame);

        stompConnection.receiveFrame();

        frame = "SUBSCRIBE\n" + "destination:/queue/" + getDestinationName() + "\n" + "ack:client\n\n";
        stompConnection.sendFrame(frame);
        try {
            while (count != 2000) {
                String receiveFrame = stompConnection.receiveFrame();
                LOG.debug("Received: " + receiveFrame);
                assertEquals("Unexpected frame received", COMMAND_MESSAGE, getCommand(receiveFrame));
                String messageId = getHeaderValue(receiveFrame, HEADER_MESSAGE_ID);
                String ackmessage = "ACK\n" + HEADER_MESSAGE_ID + ":" + messageId.trim() + "\n\n";
                stompConnection.sendFrame(ackmessage);
                // Thread.sleep(1000);
                ++messagesCount;
                ++count;
            }
        } catch (IOException ex) {
            ex.printStackTrace();
        }

        stompConnection.sendFrame("DISCONNECT\n\n");
        stompConnection.close();
        broker.stop();

        LOG.info("Total messages received: " + messagesCount);
        assertTrue("Messages received after connection loss: " + messagesCount, messagesCount >= 2000);

        // The first ack messages has no chance complete, so we receiving more
        // messages

        // Don't know how to list subscriptions for the broker. Currently you
        // can check using JMX console. You'll see
        // Subscription without any connections
    }

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

    // These two methods could move to a utility class
    protected String getCommand(String frame) {
        return frame.substring(0, frame.indexOf('\n') + 1).trim();
    }

    protected String getHeaderValue(String frame, String header) throws IOException {
        DataInput input = new DataInputStream(new ByteArrayInputStream(frame.getBytes()));
        String line;
        for (int idx = 0; /* forever, sort of */; ++idx) {
            line = input.readLine();
            if (line == null) {
                // end of message, no headers
                return null;
            }
            line = line.trim();
            if (line.length() == 0) {
                // start body, no headers from here on
                return null;
            }
            if (idx > 0) { // Ignore command line
                int pos = line.indexOf(':');
                if (header.equals(line.substring(0, pos))) {
                    return line.substring(pos + 1).trim();
                }
            }
        }
    }
}