org.directwebremoting.jms.DwrMessageProducer Maven / Gradle / Ivy

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DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boiler plate code between the web browser and your Java code.
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/*
 * Copyright 2005 Joe Walker
 *
 * 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 org.directwebremoting.jms;

import java.util.Date;
import java.util.UUID;

import javax.jms.Destination;
import javax.jms.IllegalStateException;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageProducer;

import org.directwebremoting.Hub;
import org.directwebremoting.HubFactory;
import org.directwebremoting.ServerContext;

/**
 * An implementation of {@link MessageProducer} that sends messages out over
 * Reverse Ajax to a client side hub
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class DwrMessageProducer implements MessageProducer
{
    /**
     * @param destination
     */
    public DwrMessageProducer(Destination destination, DwrConnection connection)
    {
        this.destination = destination;
        ServerContext serverContext = connection.getServerContext();

        if (serverContext != null)
        {
            hub = HubFactory.get(serverContext);
        }
        else
        {
            hub = HubFactory.get();
        }
    }

    /* (non-Javadoc)
     * @see javax.jms.MessageProducer#close()
     */
    public void close() throws JMSException
    {
        state = State.CLOSED;
    }

    /* (non-Javadoc)
     * @see javax.jms.MessageProducer#getDeliveryMode()
     */
    public int getDeliveryMode() throws JMSException
    {
        return deliveryMode;
    }

    /* (non-Javadoc)
     * @see javax.jms.MessageProducer#getDestination()
     */
    public Destination getDestination() throws JMSException
    {
        return destination;
    }

    /* (non-Javadoc)
     * @see javax.jms.MessageProducer#getDisableMessageID()
     */
    public boolean getDisableMessageID() throws JMSException
    {
        return disableMessageID;
    }

    /* (non-Javadoc)
     * @see javax.jms.MessageProducer#getDisableMessageTimestamp()
     */
    public boolean getDisableMessageTimestamp() throws JMSException
    {
        return disableMessageTimestamp;
    }

    /* (non-Javadoc)
     * @see javax.jms.MessageProducer#getPriority()
     */
    public int getPriority() throws JMSException
    {
        return priority;
    }

    /* (non-Javadoc)
     * @see javax.jms.MessageProducer#getTimeToLive()
     */
    public long getTimeToLive() throws JMSException
    {
        return timeToLive;
    }

    /* (non-Javadoc)
     * @see javax.jms.MessageProducer#send(javax.jms.Message)
     */
    public void send(Message message) throws JMSException
    {
        send(destination, message, deliveryMode, priority, timeToLive);
    }

    /* (non-Javadoc)
     * @see javax.jms.MessageProducer#send(javax.jms.Destination, javax.jms.Message)
     */
    public void send(Destination realDestination, Message message) throws JMSException
    {
        send(realDestination, message, deliveryMode, priority, timeToLive);
    }

    /* (non-Javadoc)
     * @see javax.jms.MessageProducer#send(javax.jms.Message, int, int, long)
     */
    public void send(Message message, int realDeliveryMode, int realPriority, long realTimeToLive) throws JMSException
    {
        send(destination, message, realDeliveryMode, realPriority, realTimeToLive);
    }

    /* (non-Javadoc)
     * @see javax.jms.MessageProducer#send(javax.jms.Destination, javax.jms.Message, int, int, long)
     */
    public void send(Destination realDestination, Message message, int realDeliveryMode, int realPriority, long realTimeToLive) throws JMSException
    {
        if (state == State.CLOSED)
        {
            throw new IllegalStateException("DwrMessageProducer has been closed");
        }

        if (!disableMessageID)
        {
            message.setJMSMessageID(UUID.randomUUID().toString());
        }

        if (!disableMessageTimestamp)
        {
            message.setJMSTimestamp(new Date().getTime());
        }

        if (realDestination instanceof DwrTopic)
        {
            DwrTopic dwrtopic = (DwrTopic) realDestination;
            String topicName = dwrtopic.getTopicName();

            hub.publish(topicName, message);
        }
        else
        {
            throw new IllegalStateException("Unsuported Destination type (" + realDestination.getClass().getCanonicalName() + "). Only Topics are currently supported.");
        }
    }

    /* (non-Javadoc)
     * @see javax.jms.MessageProducer#setDeliveryMode(int)
     */
    public void setDeliveryMode(int deliveryMode) throws JMSException
    {
        this.deliveryMode = deliveryMode;
        throw Unsupported.noManualAcknowledgment();
    }

    /* (non-Javadoc)
     * @see javax.jms.MessageProducer#setDisableMessageID(boolean)
     */
    public void setDisableMessageID(boolean disableMessageID) throws JMSException
    {
        this.disableMessageID = disableMessageID;
    }

    /* (non-Javadoc)
     * @see javax.jms.MessageProducer#setDisableMessageTimestamp(boolean)
     */
    public void setDisableMessageTimestamp(boolean disableMessageTimestamp) throws JMSException
    {
        this.disableMessageTimestamp = disableMessageTimestamp;
    }

    /* (non-Javadoc)
     * @see javax.jms.MessageProducer#setPriority(int)
     */
    public void setPriority(int priority) throws JMSException
    {
        this.priority = priority;
        throw Unsupported.noMessagePriority();
    }

    /* (non-Javadoc)
     * @see javax.jms.MessageProducer#setTimeToLive(long)
     */
    public void setTimeToLive(long timeToLive) throws JMSException
    {
        this.timeToLive = timeToLive;
        throw Unsupported.noMessageExpiry();
    }

    /**
     * The DWR hub that does the real work
     */
    private Hub hub;

    /**
     * The default queue or topic
     */
    private final Destination destination;

    /**
     * For queues: are messages persistent
     */
    private int deliveryMode;

    /**
     * Have we been closed?
     */
    private State state;

    /**
     * Do we skip assigning message IDs?
     */
    private boolean disableMessageID;

    /**
     * Do we skip assigning timestamps
     */
    private boolean disableMessageTimestamp;

    /**
     * What is the default priority for messages we produce
     */
    private int priority;

    /**
     * How long before the system can delete messages that we produce
     */
    private long timeToLive;
}