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/*
 * @(#)Message.java	1.5 07/02/07
 */ 

package com.sun.messaging.jms;

/** The <CODE>com.sun.messaging.jms.Message</CODE> interface defines
  * enhanced capabilities of a JMS Message in GlassFish(tm) Message Queue.
  * <P>
  * It defines
  * <UL>
  *   <LI>Additional methods available for custom message acknowledgement
  * behavior.
  * </UL>
  *
  * @see         javax.jms.Message
  */

public interface Message {

    /** Acknowledges this consumed message only.
      *  
      * <P>All consumed JMS messages in GlassFish(tm) Message Queue support the
      * <CODE>acknowledgeThisMessage</CODE> 
      * method for use when a client has specified that its JMS session's 
      * consumed messages are to be explicitly acknowledged.  By invoking 
      * <CODE>acknowledgeThisMessage</CODE> on a consumed message, a client
      * acknowledges only the specific message that the method is invoked on.
      * 
      * <P>Calls to <CODE>acknowledgeThisMessage</CODE> are ignored for both transacted 
      * sessions and sessions specified to use implicit acknowledgement modes.
      *
      * @exception javax.jms.JMSException if the messages fail to get
      *            acknowledged due to an internal error.
      * @exception javax.jms.IllegalStateException if this method is called
      *            on a closed session.
      *
      * @see javax.jms.Session#CLIENT_ACKNOWLEDGE
      * @see javax.jms.Message#acknowledge() javax.jms.Message.acknowledge()
      * @see com.sun.messaging.jms.Message#acknowledgeUpThroughThisMessage()
      */ 
    void
    acknowledgeThisMessage() throws javax.jms.JMSException;

    /** Acknowledges consumed messages of the session up through
      * and including this consumed message.
      *  
      * <P>All consumed JMS messages in GlassFish(tm) Message Queue support the
      * <CODE>acknowledgeUpThroughThisMessage</CODE> 
      * method for use when a client has specified that its JMS session's 
      * consumed messages are to be explicitly acknowledged.  By invoking 
      * <CODE>acknowledgeUpThroughThisMessage</CODE> on a consumed message,
      * a client acknowledges messages starting with the first
      * unacknowledged message and ending with this message that
      * were consumed by the session that this message was delivered to.
      * 
      * <P>Calls to <CODE>acknowledgeUpThroughThisMessage</CODE> are
      * ignored for both transacted sessions and sessions specified
      * to use implicit acknowledgement modes.
      *
      * @exception javax.jms.JMSException if the messages fail to get
      *            acknowledged due to an internal error.
      * @exception javax.jms.IllegalStateException if this method is called
      *            on a closed session.
      *
      * @see javax.jms.Session#CLIENT_ACKNOWLEDGE
      * @see javax.jms.Message#acknowledge() javax.jms.Message.acknowledge()
      * @see com.sun.messaging.jms.Message#acknowledgeThisMessage()
      */ 
    void
    acknowledgeUpThroughThisMessage() throws javax.jms.JMSException;

}
