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8 9 10 11 12 QueueSender sender = session.createSendor (Queue); TextMessage textMsg = session.createTextMessage (): textMsg.setText (message); sender.send (textMsg); connect.close ();
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We now walk through this code snippet, line by line:
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Line 1 This line simply de nes the data for the message. In this case, the data is a String: Hello World . This is the message body we want to send to the queue. Lines 2 3 In order to send a JMS message, we need a connection to the JMS provider. The connection to the JMS provider is obtained through a JMS connection factory. This factory is obtained through an environment variable called QueueFactory. Lines 4 5 Next we look up the queue to which we will send the message by name using JNDI. Our queue is named MyQueue. Once again, behind the scenes it looks up the environmental variable for the queue.
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Get the connection factory reference
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Get the reference to the queue
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Get the actual connection to JMS provider
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Create a queue session
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Create a sender for specific queue
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Create a text message
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Send the text message
Close the connection
Flow of code for sending a message in a point-to-point model
Six
Line 6 Next we use the connection factory to obtain a connection to the JMS provider by calling the method createQueueConnection(). Line 7 Once a queue connection is obtained, it is used is create a QueueSession, which is used to group the actions of sending and receiving messages. Line 8 Next we use the QueueSession to create a QueueSender for the speci c queue we are interested in. Line 9 From the QueueSession we also create a message object. In this case the message is a text message, so we create a message object of type text. Line 10 Next we set the content of the text message object by using the String Hello World . Line 11 We send the message using the send() function. Line 12 As a last step, we close the connection in order to conserve resources.
Sending a Message in Publish-and-Subscribe Model
In the publish-and-subscribe model, the message is sent to a topic instead of a queue, as was done previously with the point-to-point model. Any number of receivers can subscribe to a given topic, and each of the subscribers will receive a copy of the message to act upon. A snippet of the code that sends a message to a topic is shown in Listing 6-3, and the flow of the code is shown in Figure 6.7. As can be seen from the code listing as well as from the code flow diagram, the code is very similar to the code used in the point-to-point model. Thus we will not explain the code here.
Listing 6-3
/Listing 6.3: Code snippet for sending a message to a queue in a publish-subscribe model 1 String message = "Hello World"; 2 TopicConnectionFactory factory = (TopicConnectionFactory) 3 jndiContext.lookup("java:comp/env/jms/TopicFactory); 4 Topic topic = (Topic) 5 jndiContext.lookup("java:comp/env/jms/MyTopic"); 6 TopicConnection connect = factory.createTopicConnection(); 7 TopicSession session = connect.createTopicConnection (true, 0); 8 TopicPublisher publisher = session.createPublisherr (topic); 9 TextMessage textMsg = session.createTextMessage (): 10 textMsg.setText (message); 11 publisher.publish(textMsg); 12 connect.close ();
Messaging
Get the connection factory reference
Get the reference to the topic
Get the actual connection to JMS provider
Create a queue session
Create a sender for specific topic
Create a text message
Publish the text message
Close the connection
Flow of code for sending a message in a publish-and-subscribe model
End Points for Receiving Messages
In this section, we provide the skeleton code for receiving a message. Once again we will employ JMS API because it is vendor neutral. To get a better idea of how JMS is used to receive and process a message, we develop a simple JMS client application. The application just receives text messages and prints the message to the standard output device. In general, there are three subtypes of message end points for receiving messages. The first type receives messages in a point-to-point scenario; the second type receives messages in a publish-subscribe scenario. These two subtypes contain similar code; therefore, we describe only one of these subtypes namely, the publish-and-subscribe message receiving end point. The third subtype, which is becoming very common, is the message driven bean. Message driven beans will be described separately in the next section. The skeleton code for receiving a text message in a publish-and-subscribe scenario is shown in Listing 6-4. In this case, the application takes as input a name for the topic factory and a name for the topic.
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