package javax.jms;

/** A <CODE>QueueSession</CODE> object provides methods for creating 
 * <CODE>QueueReceiver</CODE>, <CODE>QueueSender</CODE>, 
 * <CODE>QueueBrowser</CODE>, and <CODE>TemporaryQueue</CODE> objects.
 *
 * <P>If there are messages that have been received but not acknowledged 
 * when a <CODE>QueueSession</CODE> terminates, these messages will be retained 
 * and redelivered when a consumer next accesses the queue.
 *
 *<P>A <CODE>QueueSession</CODE> is used for creating Point-to-Point specific
 * objects. In general, use the <CODE>Session</CODE> object. 
 * The <CODE>QueueSession</CODE> is used to support
 * existing code. Using the <CODE>Session</CODE> object simplifies the 
 * programming model, and allows transactions to be used across the two 
 * messaging domains.
 * 
 * <P>A <CODE>QueueSession</CODE> cannot be used to create objects specific to the 
 * publish/subscribe domain. The following methods inherit from 
 * <CODE>Session</CODE>, but must throw an
 * <CODE>IllegalStateException</CODE> 
 * if they are used from <CODE>QueueSession</CODE>:
 *<UL>
 *   <LI><CODE>createDurableSubscriber</CODE>
 *   <LI><CODE>createTemporaryTopic</CODE>
 *   <LI><CODE>createTopic</CODE>
 *   <LI><CODE>unsubscribe</CODE>
 * </UL>
 *
 * @see         javax.jms.Session
 * @see         javax.jms.QueueConnection#createQueueSession(boolean, int)
 * @see         javax.jms.XAQueueSession#getQueueSession()
 */

public interface QueueSession extends Session
{

   /** Creates a queue identity given a <CODE>Queue</CODE> name.
    *
    * <P>This facility is provided for the rare cases where clients need to
    * dynamically manipulate queue identity. It allows the creation of a
    * queue identity with a provider-specific name. Clients that depend 
    * on this ability are not portable.
    *
    * <P>Note that this method is not for creating the physical queue. 
    * The physical creation of queues is an administrative task and is not
    * to be initiated by the JMS API. The one exception is the
    * creation of temporary queues, which is accomplished with the 
    * <CODE>createTemporaryQueue</CODE> method.
    *
    * @param queueName the name of this <CODE>Queue</CODE>
    *
    * @return a <CODE>Queue</CODE> with the given name
    *
    * @exception JMSException if the session fails to create a queue
    *                         due to some internal error.
    */

   Queue createQueue(String queueName) throws JMSException;

   /** Creates a <CODE>QueueReceiver</CODE> object to receive messages from the
    * specified queue.
    *
    * @param queue the <CODE>Queue</CODE> to access
    *
    * @exception JMSException if the session fails to create a receiver
    *                         due to some internal error.
    * @exception InvalidDestinationException if an invalid queue is specified.
    */

   QueueReceiver createReceiver(Queue queue) throws JMSException;

   /** Creates a <CODE>QueueReceiver</CODE> object to receive messages from the 
    * specified queue using a message selector.
    *  
    * @param queue the <CODE>Queue</CODE> to access
    * @param messageSelector only messages with properties matching the
    * message selector expression are delivered. A value of null or
    * an empty string indicates that there is no message selector 
    * for the message consumer.
    *  
    * @exception JMSException if the session fails to create a receiver
    *                         due to some internal error.
    * @exception InvalidDestinationException if an invalid queue is specified.
    * @exception InvalidSelectorException if the message selector is invalid.
    *
    */

   QueueReceiver createReceiver(Queue queue, String messageSelector) throws JMSException;

   /** Creates a <CODE>QueueSender</CODE> object to send messages to the 
    * specified queue.
    *
    * @param queue the <CODE>Queue</CODE> to access, or null if this is an 
    * unidentified producer
    *
    * @exception JMSException if the session fails to create a sender
    *                         due to some internal error.
    * @exception InvalidDestinationException if an invalid queue is specified.
    */

   QueueSender createSender(Queue queue) throws JMSException;

   /** Creates a <CODE>QueueBrowser</CODE> object to peek at the messages on 
    * the specified queue.
    *
    * @param queue the <CODE>Queue</CODE> to access
    *
    * @exception JMSException if the session fails to create a browser
    *                         due to some internal error.
    * @exception InvalidDestinationException if an invalid queue is specified.
    */

   QueueBrowser createBrowser(Queue queue) throws JMSException;

   /** Creates a <CODE>QueueBrowser</CODE> object to peek at the messages on 
    * the specified queue using a message selector.
    *  
    * @param queue the <CODE>Queue</CODE> to access
    * @param messageSelector only messages with properties matching the
    * message selector expression are delivered. A value of null or
    * an empty string indicates that there is no message selector 
    * for the message consumer.
    *  
    * @exception JMSException if the session fails to create a browser
    *                         due to some internal error.
    * @exception InvalidDestinationException if an invalid queue is specified.
    * @exception InvalidSelectorException if the message selector is invalid.
    */

   QueueBrowser createBrowser(Queue queue, String messageSelector) throws JMSException;

   /** Creates a <CODE>TemporaryQueue</CODE> object. Its lifetime will be that 
    * of the <CODE>QueueConnection</CODE> unless it is deleted earlier.
    *
    * @return a temporary queue identity
    *
    * @exception JMSException if the session fails to create a temporary queue
    *                         due to some internal error.
    */

   TemporaryQueue createTemporaryQueue() throws JMSException;
}
