org.exolab.jms.client
Class JmsSession

java.lang.Object
  |
  +--org.exolab.jms.client.JmsSession

All Implemented Interfaces:

JmsMessageListener, javax.jms.MessageListener, MessageSessionIfc, QueueWorker, java.lang.Runnable, javax.jms.Session

Direct Known Subclasses:

JmsQueueSession, JmsTopicSession

public abstract class JmsSession

extends java.lang.Object

implements javax.jms.Session, JmsMessageListener, MessageSessionIfc, QueueWorker

This class implements a Session interface and supports a single threaded context. A session supports multiple consumers and producers but only within the context of a single thread, which is the thread creating this object. Any attempt to use an instance of this class in a thread, aside from the one that created it will result in a MessageException

Version:

$Revision: 1.55 $ $Date: 2003/10/19 14:37:27 $

Author:

Jim Alateras, Tim Anderson

Fields inherited from interface javax.jms.Session

AUTO_ACKNOWLEDGE, CLIENT_ACKNOWLEDGE, DUPS_OK_ACKNOWLEDGE

Method Summary

void	acknowledgeMessage(javax.jms.Message message) Acknowledge the specified message.
protected void	addConsumer(JmsMessageConsumer consumer) Add a consumer to the list of consumers managed by this session
protected void	addProducer(JmsMessageProducer producer) Add a producer to the list of producers managed by this session
protected void	checkThreadContext() This method checks that the thread using this object is indeed the thread that originally created this object, If this is not the case then the routine throws a JMSException indicating that the current thread is not registered to use this object This now logs a warning message, that another thread
void	close()
void	commit()
javax.jms.BytesMessage	createBytesMessage()
javax.jms.MapMessage	createMapMessage()
javax.jms.Message	createMessage()
javax.jms.ObjectMessage	createObjectMessage()
javax.jms.ObjectMessage	createObjectMessage(java.io.Serializable object)
javax.jms.StreamMessage	createStreamMessage()
javax.jms.TextMessage	createTextMessage()
javax.jms.TextMessage	createTextMessage(java.lang.String text)
void	destroy() Release local resources used by this session object
void	enableAsynchronousDelivery(long clientId, java.lang.String id, boolean enable) Enable or disable asynchronous message delivery for the specified client.
void	execute(java.lang.Object object) This is the called to process messages asynchronously delivered by the server.
int	getAckMode() Return the acknowledgement mode for the session
protected JmsSessionStubIfc	getJmsSessionStub() Return an instance of the remote stub.
javax.jms.MessageListener	getMessageListener()
protected long	getNextConsumerId() Returns the next seed value to be allocated to a new consumer
java.lang.String	getSessionId() Return a reference to the session identifier
boolean	getTransacted()
protected boolean	isClosed() Check if the session is closed
void	onMessage(javax.jms.Message message)
void	onMessageAvailable(long clientId) Inform the session that there is a message available for the message consumer with the specified identity
void	onMessages(java.util.Vector messages) Send the specified collection of messages to the client
void	recover()
protected void	removeConsumer(JmsMessageConsumer consumer) Remove the consumer with the specified id from the list of managed consumers
void	removeMessageListener(JmsMessageConsumer listener) Remove the message listener for the specified destination
protected void	removeProducer(JmsMessageProducer producer) Remove the producer from the list of managed producers
javax.jms.Message	retrieveMessage(long clientId, long wait) Fetch the next message for this client.
java.util.Vector	retrieveMessages(long clientId, int count) Fetch upto count messages from the endpoint.
void	rollback()
void	run()
protected void	sendMessage(javax.jms.Message message) Send the specified message to the server.
void	setMessageListener(JmsMessageConsumer listener) This will set the message listener for a particular consumer.
void	setMessageListener(javax.jms.MessageListener listener)
void	start() This will start message delivery to this session.
void	stop() This will stop message delivery to this session.

Methods inherited from class java.lang.Object

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

Method Detail

createBytesMessage

public javax.jms.BytesMessage createBytesMessage()
                                          throws javax.jms.JMSException

Specified by:

createBytesMessage in interface javax.jms.Session

createMapMessage

public javax.jms.MapMessage createMapMessage()
                                      throws javax.jms.JMSException

Specified by:

createMapMessage in interface javax.jms.Session

createMessage

public javax.jms.Message createMessage()
                                throws javax.jms.JMSException

Specified by:

createMessage in interface javax.jms.Session

createObjectMessage

public javax.jms.ObjectMessage createObjectMessage()
                                            throws javax.jms.JMSException

Specified by:

createObjectMessage in interface javax.jms.Session

createObjectMessage

public javax.jms.ObjectMessage createObjectMessage(java.io.Serializable object)
                                            throws javax.jms.JMSException

Specified by:

createObjectMessage in interface javax.jms.Session

createStreamMessage

public javax.jms.StreamMessage createStreamMessage()
                                            throws javax.jms.JMSException

Specified by:

createStreamMessage in interface javax.jms.Session

createTextMessage

public javax.jms.TextMessage createTextMessage()
                                        throws javax.jms.JMSException

Specified by:

createTextMessage in interface javax.jms.Session

createTextMessage

public javax.jms.TextMessage createTextMessage(java.lang.String text)
                                        throws javax.jms.JMSException

Specified by:

createTextMessage in interface javax.jms.Session

getTransacted

public boolean getTransacted()
                      throws javax.jms.JMSException

Specified by:

getTransacted in interface javax.jms.Session

commit

public void commit()
            throws javax.jms.JMSException

Specified by:

commit in interface javax.jms.Session

rollback

public void rollback()
              throws javax.jms.JMSException

Specified by:

rollback in interface javax.jms.Session

close

public void close()
           throws javax.jms.JMSException

Specified by:

close in interface javax.jms.Session

recover

public void recover()
             throws javax.jms.JMSException

Specified by:

recover in interface javax.jms.Session

getMessageListener

public javax.jms.MessageListener getMessageListener()
                                             throws javax.jms.JMSException

Specified by:

getMessageListener in interface javax.jms.Session

setMessageListener

public void setMessageListener(javax.jms.MessageListener listener)
                        throws javax.jms.JMSException

Specified by:

setMessageListener in interface javax.jms.Session

run

public void run()

Specified by:

run in interface javax.jms.Session

setMessageListener

public void setMessageListener(JmsMessageConsumer listener)
                        throws javax.jms.JMSException

This will set the message listener for a particular consumer.

If a listener is already registered for the consumer, it will be automatically overwritten

Parameters:

listener - the message listener

removeMessageListener

public void removeMessageListener(JmsMessageConsumer listener)
                           throws javax.jms.JMSException

Remove the message listener for the specified destination

Parameters:

listener - the message listener

start

public void start()
           throws javax.jms.JMSException

This will start message delivery to this session. If message delivery has already started then this is a no-op.

Throws:

javax.jms.IllegalStateException - if the session is closed

javax.jms.JMSException - if message delivery can't be started

stop

public void stop()
          throws javax.jms.JMSException

This will stop message delivery to this session. If message delivery has already stoped then this is a no-op.

Throws:

javax.jms.IllegalStateException - if the session is closed

javax.jms.JMSException - if message delivery can't be stopped

acknowledgeMessage

public void acknowledgeMessage(javax.jms.Message message)
                        throws javax.jms.JMSException

Acknowledge the specified message. If the session is transacted then cache the acks until commit or rollback, otherwise just forward the ack.

Acking a message automatically acks all those that have come before it.

Specified by:

acknowledgeMessage in interface MessageSessionIfc

Parameters:

message - the message to acknowledge

Throws:

javax.jms.JMSException - if the message can't be acknowledged

enableAsynchronousDelivery

public void enableAsynchronousDelivery(long clientId,
                                       java.lang.String id,
                                       boolean enable)
                                throws javax.jms.JMSException

Enable or disable asynchronous message delivery for the specified client.

Parameters:

clientId - - the client identity

id - - the last message delivered asynchronously

enable - - true to enable; false to disable

Throws:

javax.jms.JMSException -

onMessage

public void onMessage(javax.jms.Message message)

Specified by:

onMessage in interface javax.jms.MessageListener

onMessages

public void onMessages(java.util.Vector messages)

Description copied from interface: JmsMessageListener

Send the specified collection of messages to the client

Specified by:

onMessages in interface JmsMessageListener

Following copied from interface: org.exolab.jms.client.JmsMessageListener

Parameters:

messages - - collection of MessageHandle objects

onMessageAvailable

public void onMessageAvailable(long clientId)

Description copied from interface: JmsMessageListener

Inform the session that there is a message available for the message consumer with the specified identity

Specified by:

onMessageAvailable in interface JmsMessageListener

Following copied from interface: org.exolab.jms.client.JmsMessageListener

Parameters:

clientId - - the identity of the client

execute

public void execute(java.lang.Object object)

This is the called to process messages asynchronously delivered by the server. The session is then responsible for delivering it to the appropriate registered consumer. If it cannot resolve the consumer then it must log an exception

If the session has a registered listener then all messages will be delivered to the session's listener instead of the individual consumer message listeners.

Specified by:

execute in interface QueueWorker

Parameters:

object - received message

getSessionId

public java.lang.String getSessionId()

Return a reference to the session identifier

Returns:

String

getAckMode

public int getAckMode()

Return the acknowledgement mode for the session

Returns:

int

sendMessage

protected void sendMessage(javax.jms.Message message)
                    throws javax.jms.JMSException

Send the specified message to the server. If the message is null or there is any other problem then throw JMSException.

Parameters:

message - the message to send

Throws:

javax.jms.JMSException - if the message can't be sent

checkThreadContext

protected void checkThreadContext()

This method checks that the thread using this object is indeed the thread that originally created this object, If this is not the case then the routine throws a JMSException indicating that the current thread is not registered to use this object This now logs a warning message, that another thread

getJmsSessionStub

protected JmsSessionStubIfc getJmsSessionStub()

Return an instance of the remote stub. This is set during object creation time

Returns:

JmsSessionStubIfc

getNextConsumerId

protected long getNextConsumerId()

Returns the next seed value to be allocated to a new consumer

Returns:

a unique identifier for a consumer for this session

addConsumer

protected void addConsumer(JmsMessageConsumer consumer)

Add a consumer to the list of consumers managed by this session

Parameters:

consumer - - the consumer to add

removeConsumer

protected void removeConsumer(JmsMessageConsumer consumer)

Remove the consumer with the specified id from the list of managed consumers

Parameters:

id - - the consumer id to remove

addProducer

protected void addProducer(JmsMessageProducer producer)

Add a producer to the list of producers managed by this session

Parameters:

producer - - the producer to add

removeProducer

protected void removeProducer(JmsMessageProducer producer)

Remove the producer from the list of managed producers

Parameters:

producer - - the producer to remove

isClosed

protected final boolean isClosed()

Check if the session is closed

Returns:

true if the session is closed

retrieveMessage

public javax.jms.Message retrieveMessage(long clientId,
                                         long wait)
                                  throws javax.jms.JMSException

Fetch the next message for this client. If the session's ackMode is client acknowledge then set the session for the message, othwerwise ack the message before returning it.

Parameters:

clientId - the consumer identififer.

wait - the maximum time to wait for a message, in milliseconds. If -1, don't wait, if 0 wait indefinitely, otherwise wait the specified time.

Returns:

the received message, or null, if no message is available

Throws:

javax.jms.JMSException - if an error occurs retrieving the message

retrieveMessages

public java.util.Vector retrieveMessages(long clientId,
                                         int count)
                                  throws javax.jms.JMSException

Fetch upto count messages from the endpoint. This should only be called through JmsQueueBrowser..

Parameters:

clientId - - scoped to the session

count - - max messages to retrieve.

Returns:

Vector - the set of retrieve messages

Throws:

javax.jms.JMSException -

destroy

public void destroy()
             throws javax.jms.JMSException

Release local resources used by this session object

Throws:

javax.jms.JMSException - - if there is a problem completing this request