Java Reference
In-Depth Information
Note
In the Java EE platform, message listeners and
CLIENT_ACKNOWLEDGE
sessions can be used only in application cli-
ents, as in this example.
With a message listener, the automatic acknowledgment happens when the
onMessage
method returns (that is, after message processing has finished). With a synchronous re-
ceiver, the client acknowledges the message after processing is complete. If you use
AUTO_ACKNOWLEDGE
with a synchronous receive, the acknowledgment happens imme-
diately after the
receive
call; if any subsequent processing steps fail, the message can-
not be redelivered.
The example is in the following directory:
tut-install
/examples/jms/advanced/ackequivexample/src/java/
The example contains an
AsynchSubscriber
class with a
TextListener
class,
a
MultiplePublisher
class, a
SynchReceiver
class, a
SynchSender
class, a
main
method, and a method that runs the other classes' threads.
The example uses the following objects:
•
jms/ConnectionFactory
,
jms/Queue
, and
jms/Topic
: resources that
you created for
“
A Simple Example of Synchronous Message Receives
” on page
•
jms/ControlQueue
: an additional queue
•
jms/DurableConnectionFactory
: a connection factory with a client ID
(see “
Creating Durable Subscriptions
” on page
364
for more information)
The new queue and connection factory are created at deployment time.
You can use either NetBeans IDE or Ant to build, package, deploy, and run
ack-
equivexample
.
To Run
ackequivexample
Using NetBeans IDE
1. To build and package the client, follow these steps.
a. From the File menu, choose Open Project.
b. In the Open Project dialog, navigate to:
tut-install
/examples/jms/advanced/
c. Select the
ackequivexample
folder.
