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JMS component relationships
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Objects Used to Create and Receive Messages in a JMS Client Application
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Four objects are used to create and receive messages in a JMS client application:
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n MessageProducer n MessageConsumer n MessageListener n MessageSelector
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A MessageProducer is created by a session and used to send messages to a destination. In the PTP model, the destination is called a queue. For the pub/sub model, the destination is called a topic. When creating a MessageProducer, you can also specify the default delivery mode (setDeliveryMode). This can be either NON_PERSISTENT, which has a lower overhead because the message is not logged, or PERSISTENT, which requires the message to be logged, typically to a database. You can also specify the priority of the message (setPriority). Priority 0 is the lowest priority and 9 is the highest priority (4 is the default). Priorities of 0 4 are grades of normal priority, and priorities of 5 9 are grades of higher priority. You can also specify the expiration time (setTimeToLive), which is the amount of time, in milliseconds, that a message should be available (set to 0 for unlimited time).
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A MessageConsumer is created by a session and used to receive messages sent to the destination. The messages can be received in one of two ways: synchronously, where the client calls one of the receive methods (receive and receiveNoWait) after the consumer is started, or asynchronously, where the client registers a MessageListener and then starts the consumer. The following code is an example of a synchronous connection. (Asynchronous connections are covered in the next section.)
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// start the connection queueConn.start(); // receive the first message (wait for a message) Message message = queueReceiver.receive(); // receive the next message (wait for a minute only) Message message = queueReceiver.receive(60000);
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8: Messaging
All messages in JMS are exchanged asynchronously between the clients, in that the producer does not receive acknowledgment from the consumer that it has processed the message. As soon as the message is sent or published, the producer is not blocked from sending or publishing another message immediately.
MessageListener
A MessageListener is an interface that needs to be implemented to process messages in an asynchronous fashion. To receive and process an asynchronous message, you must do the following:
n Create an object that implements the MessageListener interface. This includes
coding the onMessage() method.
n Register the object with the session via the setMessageListener()
method.
n Call the Start() method on the Connection object to begin receiving messages.
MessageSelector
A MessageSelector is a java.lang.String object specified by the client by the createSubscriber() method. The MessageSelector filters out messages that do not meet the criteria specified. The MessageSelector examines the message header and properties fields and compares them to an expression contained in a string. The syntax of this expression is based on a subset of SQL92 conditional expression syntax. SQL92 is a standard published by the SQL Standards committee formed by the American National Standards Institute and the International Standards Organization. A message digest is a Table 8-6 shows some examples of these digital ngerprint value that is computed expressions, and the PTP example that is from a message, le, or byte stream. covered next shows a receiver that reads the queue with and without a MessageSelector.
How the Point-to Point Message Model Works
The PTP message model sends messages to a receiver on a one-to-one basis. Figure 8-4 is a diagram showing the PTP model.
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TABLE 8-6
Value
Arithmetic operators Comparison operators Expressions
Example
+, -, *, / <, >, <=, >=, IS NULL, IS NOT NULL, BETWEEN (Qty * Price) >= 12300 Day = 'Tuesday' Month NOT IN ('June', 'July', 'August') Description LIKE 'UNITED%' $name, JMSPriority, JMSXId, JMS_timeout 'string literal', 64, FALSE AND, OR, NOT
JMS Message Selector Examples
Identifiers Literals Logical operators
Examples of PTP implementation include the following:
n Instant messaging n Receiving a transaction from another system n Sending an order to another system n Supply-chain processing
A message is delivered to a destination, known as a queue. Messages in a queue are processed on a first-in, first-out (FIFO) basis. In other words, the subscriber is guaranteed to get each message in the order in which it was sent. The first available receiver processes each message once. This differs from the pub/sub model, in which a single message can be published to one or more subscribers. In addition to processing the next message in a queue, the receiver is also able to browse through the messages in a queue (for example, to count them), but the receiver is unable to process the messages in any other order than FIFO. The following is a list of the steps and interface classes required for the PTP model of communication: 1. Obtain the QueueConnectionFactory object via a JNDI lookup (the JNDI name will vary depending on the messaging vendor and site naming conventions).
FIGURE 8-4
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