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The highlight of the event was being bile-blogged and meeting Hani in
person.
We abstracted the components' interaction with the MSMQ MessageQueue
objects behind the IMessageSender and IMessageReceiver interfaces.
I admit that constraining the Correlation Identifier in our book only to
the context of Request-Reply is inconsistent with the usage in the world
of orchestration.
We need to keep in mind, though, that requirements for submission to
OASIS are fairly loose. The messaging component uses the factory object
to obtain references to the IMessageSender interface to send reply
messages.
To illustrate this point, let's see what happens when we insert and
intermediary, such as a Message Router, between the requestor and the
replier.
One of the nice properties of Pipes-and-Filters architectures is that
they can be realized in many different technologies.
That's why I propose that architects and developers of service-oriented
architectures should look at these standards as a form of Jeopardy. How
then, do we keep tabs on what is going on in the system?
Many other integration books also start with an overview of integration
styles. Additionally, requiring reply messages to return the same path
that the request messages were sent might mean unnecessary message
traffic.
I am not saying that Microsoft Web services implementation is better
than Sun's but at least give us a fair comparison instead of slides
filled with meaningless numbers. In the absence of a metadata repository
we can capture all messages that flow through the system in a central
Message Store. I attended a good session on Fast Web Services.
I attended a good session on Fast Web Services. We can track dynamic
communication between components, such as usage of Return Addresses but
avoid having to intercept every single message. This can be accomplished
in a number of ways, such as: Metadata Repository Message Store
Subscription Tracker A number of packaged EAI tools, such as TIBCO,
feature a Metadata Repository. Conclusion A Request-Reply interaction
between a service consumer and a service provider is really just a
simple example of a conversation between multiple participants.
Admittedly, that categorization is a tad more fuzzy but I am sure you
will agree that it is again somewhat independent from the other
classifications. To be more efficient we should only track subscription
and publication requests. Next time I need to coordinate with Bill
Venners to get the whole scoop on JINI-related events at JavaOne. For
example, an implementation could use third party middleware a la JMS,
TIBCO, MQ etc.
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