WebSphere Application Server V7.0: Concepts ... - IBM Redbooks

If the bus member is a cluster of application servers, a queue point is created
and associated with each messaging engine defined within the bus member.
The queue destination is partitioned across the available messaging engines
within the cluster. In this configuration, message ordering is not maintained on
the queue destination.
► Publication points
A publication point is the message point for a topic space. When creating a
topic space destination, an administrator does not need to specify a bus
member to hold messages for the topic space. Creating a topic space
destination automatically defines a publication point on each messaging
engine within the bus.
Foreign bus and link
A foreign bus is an external messaging product that is either another SIBus or a
WebSphere MQ network. You can set up a link to it so that messages traverse
from one bus to another. The WebSphere MQ network can be seen as a foreign
bus by the WebSphere Application Server default messaging provider using a
WebSphere MQ link.
JMS and the default messaging provider
Java Enterprise Edition (Java EE) applications (producers and consumers)
access the SIBus and the bus members through the JMS API. JMS destinations
are associated with SIBus destinations. A SIBus destination implements a JMS
destination function. Session Enterprise JavaBeans (EJBs) use a JMS
connection factory to connect to the JMS provider. Message Driven Beans
(MDBs) use a JMS activation specification to connect to the JMS provider. See
Figure 10-1 on page 343.
342 WebSphere Application Server V7.0: Concepts, Planning, and Design