Module jakarta.messaging

Package jakarta.jms

Class QueueRequestor

java.lang.Object

jakarta.jms.QueueRequestor

public class QueueRequestor
extends Object

The QueueRequestor helper class simplifies making service requests.

The QueueRequestor constructor is given a non-transacted QueueSession and a destination Queue. It creates a TemporaryQueue for the responses and provides a request method that sends the request message and waits for its reply.

This is a very basic request/reply abstraction which assumes the session is non-transacted with a delivery mode of either AUTO_ACKNOWLEDGE or DUPS_OK_ACKNOWLEDGE. It is expected that most applications will create less basic implementations.

Since:

JMS 1.0

Version:

Jakarta Messaging 2.0

See Also:

• TopicRequestor

Constructor Summary

Constructors

Constructor	Description
QueueRequestor(QueueSession session, Queue queue)	Constructor for the QueueRequestor class.

Method Summary

Modifier and Type	Method	Description
void	close()	Closes the QueueRequestor and its session.
Message	request(Message message)	Sends a request and waits for a reply.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

QueueRequestor

public QueueRequestor(QueueSession session,
 Queue queue)
               throws JMSException

Constructor for the QueueRequestor class.

This implementation assumes the session parameter to be non-transacted, with a delivery mode of either AUTO_ACKNOWLEDGE or DUPS_OK_ACKNOWLEDGE.

Parameters:

session - the QueueSession the queue belongs to

queue - the queue to perform the request/reply call on

Throws:

JMSException - if the Jakarta Messaging provider fails to create the QueueRequestor due to some internal error.

InvalidDestinationException - if an invalid queue is specified.

Method Details

request

public Message request(Message message)
                throws JMSException

Sends a request and waits for a reply. The temporary queue is used for the JMSReplyTo destination, and only one reply per request is expected.

Parameters:

message - the message to send

Returns:

the reply message

Throws:

JMSException - if the Jakarta Messaging provider fails to complete the request due to some internal error.

close

public void close()
           throws JMSException

Closes the QueueRequestor and its session.

Since a provider may allocate some resources on behalf of a QueueRequestor outside the Java virtual machine, clients should close them when they are not needed. Relying on garbage collection to eventually reclaim these resources may not be timely enough.

Note that this method closes the QueueSession object passed to the QueueRequestor constructor.

Throws:

JMSException - if the Jakarta Messaging provider fails to close the QueueRequestor due to some internal error.