barcode font vb.net Introducing Java Messaging Service in Java

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Introducing Java Messaging Service
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acknowledge mode and only has an effect for nontransactional sessions receiving messages, which we ll discuss later. Having set up the session, we are now ready to take on the meat of the matter: sending the message. Preparing and sending the message The session is not directly used for sending or receiving messages (we could argue that having it do so would simplify the JMS API). Instead, a javax.jms.MessageProducer needed to send messages to the shipping request queue is constructed using the session s createProducer method. Then we create and populate the javax.jms.Message to be sent. In our example, we send the Serializable Java object ShippingRequest to Turtle, so the most appropriate message type for us is javax.jms.ObjectMessage (which we create using the createObjectMessage method). We then create an instance of the ShippingRequest object and set the item number, shipping address, shipping method, and insurance amount fields. Once ShippingRequest is set up, we set it as the payload of the message using setObject. Finally, we instruct the message producer to send the message out using the send method. Releasing resources A large number of resources are allocated under the hood for both the session and connection objects, so it is important to explicitly close both once we ve finished with them, as we do with
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session.close(); connection.close();
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This step is even more important in our case since no messages are sent out until our transactional session is committed when we close the session. If all goes well, a message containing the shipping request winds up in the queue. Before we look at the message consumer code that receives this message, let s discuss the javax.jms.Message object in a little more detail.
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4.2.2 The JMS message interface
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The Message interface standardizes what is exchanged across JMS and is an extremely robust data encapsulation mechanism. As figure 4.6 shows, a JMS message has the following parts: the message header, message properties, and the message body, each of which is detailed in the sections that follow. A good analogy for JMS messages is mailing envelopes. Let s see how this analogy fits next.
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Messaging and developing MDBs
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Figure 4.6 Anatomy of a message. A JMS message has a header, properties, and a body.
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Message headers Headers are name-value pairs common to all messages. In our envelope analogy, the message header is the information on an envelope that is pretty standard: the to and from addresses, postage, and postmark. For example, the JMS message version of a postmark is the JMSTimestamp header. MOM sets this header to the current time when the message is sent. Here are some other commonly used JMS headers:
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JMSCorrelationID JMSReplyTo JMSMessageID
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Message properties Message properties are just like headers, but are explicitly created by the application instead of being standard across messages. In the envelope analogy, if you decide to write Happy Holidays on the envelope to let the receiver know the envelope contains a gift or note, the text is a property instead of a header. In the ActionBazaar example, one way to mark a shipping request as fragile would be to add a boolean property called Fragile and set it to true. The code to do this would look like this:
message.setBooleanProperty("Fragile", true);
A property can be a boolean, byte, double, float, int, long, short, String, or Object.
Working with message-driven beans
Message body The message body contains the contents of the envelope; it is the payload of the message. What you re trying to send in the body determines what message type you should use. In listing 4.1, we chose javax.jms.ObjectMessage because we were sending out the ShippingRequest Java object. Alternatively, we could have chosen to send BytesMessage, MapMessage, StreamMessage, or TextMessage. Each of these message types has a slightly different interface and usage pattern. There are no hard-and-fast rules dictating the choice of message types. Explore all the choices before making a decision for your application.
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