May 2009
Intermediate to advanced
330 pages
10h 34m
English
Content preview from Java Message Service, 2nd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Message Types
The Java Message Service defines six Message interface types that must be supported
by JMS providers. Although JMS defines the Message interfaces, it doesn’t define their
implementation. This allows vendors to implement and transport messages
in their own way, while maintaining a consistent and standard interface
for the JMS application developer. The six message
interfaces are Message and its five
subinterfaces: TextMessage, StreamMessage, MapMessage, ObjectMessage, and BytesMessage.
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 TextMessage, BytesMessage, and StreamMessage 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’s SonicMQ, for example, provides an XMLMessage type that extends the TextMessage, allowing developers to deal with
the message directly through DOM or SAX interfaces.
Message
The simplest type of message is the javax.jms.Message, which serves as the base
interface to the other message types. As shown below, the Message type can be created and used as a
JMS message with no payload:
// Create and deliver a Message Message message = session.createMessage(); publisher.publish(message); ... // Receive a ...
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