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package javax.jms;

/** For application servers, <CODE>Connection</CODE> objects provide a special 
  * facility 
  * for creating a <CODE>ConnectionConsumer</CODE> (optional). The messages it 
  * is to consume are 
  * specified by a <CODE>Destination</CODE> and a message selector. In addition,
  * a <CODE>ConnectionConsumer</CODE> must be given a 
  * <CODE>ServerSessionPool</CODE> to use for 
  * processing its messages.
  *
  * <P>Normally, when traffic is light, a <CODE>ConnectionConsumer</CODE> gets a
  * <CODE>ServerSession</CODE> from its pool, loads it with a single message, and
  * starts it. As traffic picks up, messages can back up. If this happens, 
  * a <CODE>ConnectionConsumer</CODE> can load each <CODE>ServerSession</CODE>
  * with more than one 
  * message. This reduces the thread context switches and minimizes resource 
  * use at the expense of some serialization of message processing.
  *
  * @version     1.1 February 8, 2002
  * @author      Mark Hapner
  * @author      Rich Burridge
  *
  * @see javax.jms.Connection#createConnectionConsumer
  * @see javax.jms.Connection#createDurableConnectionConsumer
  * @see javax.jms.QueueConnection#createConnectionConsumer
  * @see javax.jms.TopicConnection#createConnectionConsumer
  * @see javax.jms.TopicConnection#createDurableConnectionConsumer
  */

public interface ConnectionConsumer {

    /** Gets the server session pool associated with this connection consumer.
      *  
      * @return the server session pool used by this connection consumer
      *  
      * @exception JMSException if the JMS provider fails to get the server 
      *                         session pool associated with this consumer due
      *                         to some internal error.
      */

    ServerSessionPool 
    getServerSessionPool() throws JMSException; 

 
    /** Closes the connection consumer.
      *
      * <P>Since a provider may allocate some resources on behalf of a 
      * connection consumer outside the Java virtual machine, clients should 
      * close these resources when
      * they are not needed. Relying on garbage collection to eventually 
      * reclaim these resources may not be timely enough.
      *  
      * @exception JMSException if the JMS provider fails to release resources 
      *                         on behalf of the connection consumer or fails
      *                         to close the connection consumer.
      */

    void 
    close() throws JMSException; 
}