topicconsumermessagehandle.java

来自「OpenJMS是一个开源的Java Message Service API 1.」· Java 代码 · 共 126 行

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 * 2. Redistributions in binary form must reproduce the
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 *    please contact [e-mail].
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 *
 * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
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 * EXOFFICE TECHNOLOGIES OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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 *
 * Copyright 2005 (C) Exoffice Technologies Inc. All Rights Reserved.
 *
 * $Id: TopicConsumerMessageHandle.java,v 1.2 2005/05/13 12:57:02 tanderson Exp $
 */
package org.exolab.jms.messagemgr;

import javax.jms.JMSException;
import javax.jms.MessageConsumer;


/**
 * A {@link MessageHandle} used by the {@link TopicDestinationCache}.
 *
 * @author <a href="mailto:[e-mail]">Tim Anderson</a>
 * @version $Revision: 1.2 $ $Date: 2005/05/13 12:57:02 $
 */
class TopicConsumerMessageHandle extends AbstractConsumerMessageHandle {

    /**
     * If <code>true</code>, indicates that the message associated with the
     * handle has been delivered, but not acknowledged.
     * This overrides the delivery status of the underlying handle, which
     * may be shared between multiple consumers.
     */
    private boolean _delivered = false;


    /**
     * Construct a new <code>TopicConsumerMessageHandle</code>.
     *
     * @param handle   the underlying handle
     * @param consumer the consumer of the handle
     * @throws JMSException if the underlying message can't be referenced
     */
    public TopicConsumerMessageHandle(MessageHandle handle,
                                      ConsumerEndpoint consumer)
            throws JMSException {
        super(handle, consumer);
        init(handle);
    }

    /**
     * Construct a new <code>TopicConsumerMessageHandle</code>
     * for a durable consumer.
     *
     * @param handle       the underlying handle
     * @param persistentId the persistent identity of the consumer
     * @throws JMSException if the underlying message can't be referenced
     */
    public TopicConsumerMessageHandle(MessageHandle handle, String persistentId)
            throws JMSException {
        super(handle, persistentId);
        init(handle);
    }

    /**
     * Indicates if a message has been delivered to a {@link MessageConsumer},
     * but not acknowledged.
     *
     * @param delivered if <code>true</code> indicates that an attempt has been
     *                  made to deliver the message
     */
    public void setDelivered(boolean delivered) {
        _delivered = delivered;
    }

    /**
     * Returns if an attempt has already been made to deliver the message.
     *
     * @return <code>true</code> if delivery has been attempted
     */
    public boolean getDelivered() {
        return _delivered;
    }

    /**
     * Initialise this handle.
     *
     * @param handle the underlying handle
     */
    private void init(MessageHandle handle) {
        _delivered = handle.getDelivered();
    }

}