By Richard Monson-Haefel, David Chappell
This publication is a radical creation to Java Message provider (JMS) from solar Microsystems. It exhibits find out how to construct functions utilizing the point-to-point and publish-andsubscribe versions; use gains like transactions and sturdy subscriptions to make purposes trustworthy; and use messaging inside of company JavaBeans. It additionally introduces a brand new EJB variety, the MessageDrivenBean, that's a part of EJB 2.0, and discusses integration of messaging into J2EE.
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Additional resources for Java Message Service
To avoid reading nonexistent name-value pairs, the MapMessage provides an itemExists( ) test method. In addition, the getMapNames( ) method lets a JMS client enumerate the names and use them to obtain all the values in the message. 7 Read-Only Messages When messages are delivered, the body of the message is made read-only. MessageNotWriteableException. The only way to change the body of a message after it has been delivered is to invoke the clearBody( ) method, which is defined in the Message interface.
A BytesMessage would write the long as 64 bits (8 bytes) of raw data, so that you could later read some of the data as a short, which is only 16 bits (the first 2 bytes of the long). The StreamMessage, on the other hand, writes the type information as well as the value of the long primitive, and enforces a strict set of conversion rules that prevent reading the long as a short. 1 shows the conversion rules for each type. The left column shows the type written, and the right column shows how that type may be read.
The Message interfaces are defined according to the kind of payload they are designed to carry. In some cases, Message types were included in JMS to support legacy payloads that are common and useful, which is the case with the text, bytes, and stream message types. In other cases, the Message types were defined to facilitate emerging needs; for example, ObjectMessage can transport serializable Java objects. Some vendors may provide other proprietary message types. Progress' SonicMQ and SoftWired's iBus, for example, provide an XMLMessage type that extends the TextMessage, allowing developers to deal with the message directly through DOM or SAX interfaces.