B2B Integration : A Practical Guide to Collaborative E-commerce

Middleware Technologies 229
The MQIS provides intelligent routing and supports transactional
management, similar to MQSeries, though this is usually accomplished
with the assistance of MTS. MSMQ also provides some of the following
features:
• Prioritization — Messages are sorted by priority within the queue.
Messages with high priority are processed before messages with low
priority.
• Encryption — Messages may be declared as public or private. Private
messages will be encrypted by MSMQ and decrypted upon receipt by
the receiver.
• Component Streaming — MSMQ allows COM/COM+ components
to be serialized into a message and reconstituted on the receiving
end.
Java message service (JMS)
The Java message service (JMS) is a recent addition to the J2EE and
EJB specification. J2EE (discussed in the section on Distributed Objects)
is a quickly evolving distributed object standard developed by Sun
Microsystems. Realizing the importance of messaging in distributed
systems, Sun has developed the JMS API, allowing Java applications to
send and receive messages.
JMS is not a traditional stand-alone MOM solution like MQSeries,
but rather a J2EE-specific messaging solution. The JMS API adds to a
common J2EE API and provider framework that enables the development
of portable, message-based applications in the Java programming
language.
JMS provides a common interface to standard messaging protocols
and to special messaging services in support of Java programs. JMS
supports point-to-point and publish-and-subscribe models.
A JMS application is composed of the following parts (see Figure 8.6):
• JMS provider is a messaging system that implements the JMS
interfaces and provides administrative and control features.
• JMS clients are Java applications that send and receive messages.
• JMS messages are standard messages consisting of a header and
body.