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4.3.6 Using ActivationConfigProperty
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The activationConfig property of the @MessageDriven annotation allows you to provide messaging system specific configuration information through an array
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Working with message-driven beans
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of ActivationConfigProperty instances. ActivationConfigProperty is defined as follows:
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public @interface ActivationConfigProperty { String propertyName(); String propertyValue(); }
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Each activation property is essentially a name-value pair that the underlying messaging provider understands and uses to set up the MDB. The best way to grasp how this works is through example. Here, we provide three of the most common JMS activation configuration properties: destinationType, connectionFactoryJndiName, and destinationName:
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@MessageDriven( name="ShippingRequestProcessor", activationConfig = { @ActivationConfigProperty( propertyName="destinationType", propertyValue="javax.jms.Queue"), @ActivationConfigProperty( propertyName="connectionFactoryJndiName", propertyValue="jms/QueueConnectionFactory" ), @ActivationConfigProperty( propertyName="destinationName", propertyValue="jms/ShippingRequestQueue") } )
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First, the destinationType property tells the container this JMS MDB is listening to a queue. If we were listening to a topic instead, the value could be specified as javax.jms.Topic. Next, connectionFactoryJndiName specifies the JNDI name of the connection factory that should be used to create JMS connections for the MDB. Finally, the destinationName parameter specifies that we are listening for messages arriving at a destination with the JNDI name of jms/ShippingRequestQueue. There are a few other configuration properties for JMS that we ll describe in the sections that follow. Visualizing what happens behind the scenes can help you remember these configuration properties. The container does something similar to our JMS message consumer setup steps (as shown in listing 4.2) to bootstrap the MDB. Most of the method parameters that we specify during those steps are made available as configuration properties in the MDB world.
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Messaging and developing MDBs
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acknowledgeMode Messages are not actually removed from the queue until the consumer acknowledges them. There are many modes through which messages can be acknowledged. By default, the acknowledge mode for the underlying JMS session is assumed to be AUTO_ACKNOWLEDGE, which means that the session acknowledged messages on our behalf in the background. This is the case for our example (since we omitted this property). All of the acknowledgment modes supported by JMS are listed in table 4.1. We could change the acknowledge mode to DUPS_OK_ACKNOWLEDGE (or any other acknowledge mode we discuss in table 4.1) using the following:
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@ActivationConfigProperty( propertyName="acknowledgeMode", propertyValue="DUPS_OK_ACKNOWLEDGE") Table 4.1 JMS session acknowledge modes. For nontransacted sessions, you should choose the mode most appropriate for your project. In general, AUTO_ACKNOWLEDGE is the most common and convenient. The only other mode supported with MDB is DUPS_OK_ACKNOWLEDGE. Acknowledgment Mode AUTO_ACKNOWLEDGE Description The session automatically acknowledges receipt after a message has been received or is successfully processed. You have to manually acknowledge the receipt of the message by calling the acknowledge method on the message. The session can lazily acknowledge receipt of the message. This is similar to AUTO_ACKNOWLEDGE but useful when the application can handle delivery of duplicate messages and rigorous acknowledgment is not a requirement. This is returned for transacted sessions if the Session.getAcknowledgeMode method is invoked. Supported with MDB YES
CLIENT_ACKNOWLEDGE
DUPS_OK_ACKNOWLEDGE
SESSION_TRANSACTED
subscriptionDurability If our MDB is listening on a topic, we can specify whether the topic subscription is durable or nondurable. Recall that in the pub-sub domain, a message is distributed to all currently subscribed consumers. In general, this is much like a broadcast message in that anyone who is not connected to the topic at the time does not receive a copy of the message. The exception to this rule is what is known as a durable subscription.
Working with message-driven beans
Once a consumer obtains a durable subscription on a topic, all messages sent to the topic are guaranteed to be delivered to that consumer. If the durable subscriber is not connected to a topic when a message is received, MOM retains a copy of the message until the subscriber connects and delivers the message. The following shows how to create a durable subscriber:
MessageConsumer playBoySubscriber = session.createDurableSubscriber( playBoyTopic, "JoeOgler");
Here, we are creating a durable subscription message consumer to the javax. jms.Topic playBoyTopic with a subscription ID of JoeOgler. From now on, all messages to the topic will be held until a consumer with the subscription ID JoeOgler receives them. You can remove this subscription with the following code:
session.unsubscribe("JoeOgler");
If you want the MDB to be a durable subscriber, then ActivationConfigProperty would look like this:
@ActivationConfigProperty( propertyName="destinationType", propertyValue="javax.jms.Topic"), @ActivationConfigProperty( propertyName="subscriptionDurability", propertyValue="Durable")
For nondurable subscriptions, explicitly set the value of the subscriptionDurability property to NonDurable, which is also the default.
messageSelector The messageSelector property is the MDB parallel to applying a selector for a JMS consumer. Our current code consumes all messages at the destination. If we prefer, we could filter the messages we retrieve by using a message selector a criterion applied to the headers and properties of messages specifying which messages the consumer wants to receive. For example, if we want to receive all shipping requests whose Fragile property is set to true, we use the following code:
MessageConsumer consumer = session.createConsumer(destination, "Fragile IS TRUE");
As you might have noticed, the selector syntax is almost identical to the WHERE clause in SQL 92, but the selector syntax uses message header and property names instead of column names. Selector expressions can be as complex and expressive
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