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Asynchronous architectures do not provide such mechanisms so that we have to track state and return addresses ourselves.

Whitney D. Emory jji@krings-sieger.com
Sun Jan 21 05:05:00 GMT 2007 
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When the component starts up, it retrieves the actual channel name from
a specified path in the repository.
As one would expect, this interest has materialized in form of a WS?
This would carry more messaging overhead but allows us to scale out
enormously.
The component then calls GraphViz to layout and render the corresponding
graph as a GIF image. The internal implementation is in fact quite
different. A key mechanism to regaining local state is the notion of
Correlation. Often these references provide useful services to the
component, such as persistence, transactional support etc.
To minimize confusion, I am happy to use the term Correlation Identifier
in both contexts, including conversations.
Unfortunately, most visual representations these days are linked to the
term modeling as in model-driven architecture. The same could not be
more true of software design. Essentially, we created a
publish-subscribe topic hierarchy based on Java classes. It seems like
we need to look beyond just the simple request-reply interaction.
The intermediary consumes the original request message and sends a new
message instance to the replier.
First, how I connect to an application is often a fairly local decision.
Dependency injection schemes are generally used to provide object
references to a component.
This type of modeling suggest that you can design the system visually
using some form of Doodleware and then more or less generate the code
for the running system. This is generally not a great idea.
HysteresisDesign decisions are hardly ever made in a vacuum. Did I
forget to eat my proverbial dog food or did I have pre-established
opinions that were not grounded in actual experience? Since we inspect a
running system we can also get data on the message volume. I am always a
little skeptic of integration-related efforts that are language specific
but maybe I am judging prematurely. Seriously, I believe that what we
are seeing now is simply the first generation of BPEL editors. Much of
the design of TCP is concerned with window size, the frequency of
acknowledgement messages, and issues such as the Silly Window Symptom.
ImplementationIt has been stated many times that computer science is the
field where every problem can be solved by just one more level of
indirection. VisualizationThe second part of the bottom-up modeling
approach is to visualize the data we captured.
Next time: the channel implementation in Java.
As with any performance tuning only a real experiment will tell. until
you realize you need fresh water andyou can only get it from Waters R Us
in the mainland.
Luckily, WingraphViz implements a COM wrapper so that we can avoid
generating DOT files to feed GraphViz. A subscriber can then choose to
subscribe to  topic. Based on the message header we can then figure out
which component sends message to which other component.
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