B2B Integration : A Practical Guide to Collaborative E-commerce

228 B2B Integration — A Practical Guide to Collaborative E-commerce
MQSeries is supported by most of the leaders in message brokering
tools (besides its own MQSeries Integrator). With its dominance in the
MOM marketplace, MQSeries will be a component of most middleware
solutions.
Microsoft message queue (MSMQ)
Microsoft introduced MSMQ in 1998 as an add-on to Windows NT,
and has become a base service in Windows 2000. MSMQ, along with
Microsoft transaction server (MTS), was Microsoft's first attempt to
penetrate the enterprise computing market. This attempt has culminated
in the recent release of their .NET architecture, which has the potential
to thrust Microsoft into a leadership role in the enterprise computing
market. Though slow to be adapted, there is definitely interest in
MSMQ, if for any reason, due to the Microsoft name.
As with most Microsoft services, MSMQ is implemented using a
series of ActiveX components and DLLs, which provide an API for
accessing its capabilities. MSMQ is Microsoft centric and will only
work within a Microsoft environment. However, gateways such as
Microsoft's host integration server (formerly SNA server) do exist to
allow MSMQ to communicate with other MOM products and other
platforms.
MSMQ uses queue managers in a point-to-point model. There are
four types of queues within MSMQ: outgoing, system, public and
private. Messages reside on queues between the time they are written
by one application and the time they are read by another. Queues use a
combination of memory and disk to provide storage consistent with
particular kinds of message.
MSMQ structures its resources around enterprises and sites.
Information about an enterprise and sites is hosted in the message
queue information store (MQIS) which is a database or distributed
directory that MSMQ uses to store information describing the network.
At the enterprise level, a primary enterprise controller (PEC) would
exist on a machine to define the information about an enterprise. Within
an enterprise, MSMQ would have sites containing a primary site
controller (PSC) and a backup site controller (BSC), which usually
correlates to one physical location.