com.fusesource.forge.jmstest.benchmark.command.transport.JMSCommandTransport.java Source code

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Here is the source code for com.fusesource.forge.jmstest.benchmark.command.transport.JMSCommandTransport.java

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/*
 * Copyright (C) 2009, Progress Software Corporation and/or its
 * subsidiaries or affiliates.  All rights reserved.
 *
 * Licensed 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 com.fusesource.forge.jmstest.benchmark.command.transport;

import java.io.Serializable;

import javax.jms.Connection;
import javax.jms.Destination;
import javax.jms.ExceptionListener;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.MessageProducer;
import javax.jms.ObjectMessage;
import javax.jms.Session;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.fusesource.forge.jmstest.benchmark.command.BenchmarkCommand;
import com.fusesource.forge.jmstest.config.JMSConnectionProvider;
import com.fusesource.forge.jmstest.config.JMSDestinationProvider;
import com.fusesource.forge.jmstest.threading.ReleaseManager;
import com.fusesource.forge.jmstest.threading.Releaseable;

public class JMSCommandTransport extends AbstractCommandTransport
        implements MessageListener, Releaseable, ExceptionListener {

    private JMSConnectionProvider jmsConnectionProvider;
    private JMSDestinationProvider jmsDestinationProvider;
    private String destinationName = "topic:benchmark.command";

    private Connection connection = null;
    private Session session = null;
    private Boolean started = false;
    private Boolean released = false;

    private Object lock = new Object();

    private Log log = null;

    public void start() {
        synchronized (lock) {
            if (started || released) {
                return;
            }
            ReleaseManager.getInstance().register(this);
            log().info("JMSCommandTransport (re)starting.");
            while (!started && !released) {
                if (getConnection() != null) {
                    try {
                        getConnection().setExceptionListener(this);
                        session = getConnection().createSession(false, Session.AUTO_ACKNOWLEDGE);
                        MessageConsumer consumer = session.createConsumer(
                                getJmsDestinationProvider().getDestination(session, getDestinationName()));
                        consumer.setMessageListener(this);
                        getConnection().start();
                        started = true;
                    } catch (Exception e) {
                        log().error("Error creating JMSCommandTransport.", e);
                        resetConnection();
                    }
                }
                if (!started) {
                    try {
                        log.warn("Trying to reinitialize JMSTransport Connection in 5 seconds.");
                        Thread.sleep(5000);
                    } catch (InterruptedException e) {
                    }
                }
            }
            if (started) {
                log().info("JMSCommandTransport started.");
            }
        }
    }

    public void stop() {
        release();
    }

    public void sendCommand(BenchmarkCommand command) {
        log.debug("Sending command message: " + command.toString());
        if (getConnection() != null) {
            try {
                Session session = getConnection().createSession(false, Session.AUTO_ACKNOWLEDGE);
                Destination dest = getJmsDestinationProvider().getDestination(session, getDestinationName());
                MessageProducer producer = session.createProducer(dest);
                producer.send(session.createObjectMessage((Serializable) command));
                session.close();
            } catch (Exception je) {
                log().error("Could not send Command " + command.toString() + ".", je);
            }
        } else {
            log.warn("Command not sent as JMS connection is not established.");
        }
    }

    public void onMessage(Message msg) {
        try {
            if (!(msg instanceof ObjectMessage)) {
                log().warn("Ignoring msg of type: " + msg.getClass());
            }
            Object obj = ((ObjectMessage) msg).getObject();
            if (!(obj instanceof BenchmarkCommand)) {
                log().warn("Ignoring msg object of type: " + obj.getClass());
            }
            getHandler().handleCommand((BenchmarkCommand) obj);
        } catch (JMSException je) {
            log().error("Unexpected error processing command message", je);
        }
    }

    public void onException(JMSException je) {
        resetConnection();
    }

    public void release() {
        closeConnection();
        released = true;
        ReleaseManager.getInstance().deregister(this);
    }

    public void setJmsConnectionProvider(JMSConnectionProvider jmsConnectionProvider) {
        this.jmsConnectionProvider = jmsConnectionProvider;
    }

    public void setJmsDestinationProvider(JMSDestinationProvider jmsDestinationProvider) {
        this.jmsDestinationProvider = jmsDestinationProvider;
    }

    public void setDestinationName(String destinationName) {
        this.destinationName = destinationName;
    }

    public JMSConnectionProvider getJmsConnectionProvider() {
        return jmsConnectionProvider;
    }

    public JMSDestinationProvider getJmsDestinationProvider() {
        return jmsDestinationProvider;
    }

    public String getDestinationName() {
        return destinationName;
    }

    synchronized private void closeConnection() {
        if (!started) {
            return;
        }

        if (session != null) {
            try {
                session.close();
            } catch (Exception e) {
                log().error("Error closing Session.", e);
            } finally {
                session = null;
            }
        }

        if (connection != null) {
            try {
                connection.close();
            } catch (Exception e) {
                log().error("Error closing connection.", e);
            } finally {
                connection = null;
            }
        }
        started = false;
    }

    private void resetConnection() {
        closeConnection();
        start();
    }

    private Connection getConnection() {
        if (connection == null) {
            try {
                connection = getJmsConnectionProvider().getConnection();
            } catch (Exception e) {
                log().error("Unable to connect to JMS Provider", e);
            }
        }
        return connection;
    }

    private Log log() {
        if (log == null) {
            log = LogFactory.getLog(this.getClass());
        }
        return log;
    }
}