P�ter,
I am not convinced that your concern is valid:
But what about large distributed company-wide systems with clusters of
EJB-containers spanning a whole headquarter and eventually several
(specialized) branches? Is not the performance cost of message protection
with EJB systems prohibitivly high in this kind of environments?
I would say no, the cost is not prohibitively high.
The reason is that even a large distributed system will exhibit locality of
connectivity (new term?). In the same way that large applications exhibit
locality of reference (which is why caches are beneficial) and locality of
behavior (which is why hot-spot-like technology is beneficial), large
distributed appications will tend to exhibit locality of connectivity. This
means that in the common case, certain connections among the clusters
will be used frequently, whereas other connections will be used rarely.
Therefore, a well-designed middleware product that provides connection
management based on connection usage patterns (basically providing a
cache behavior for connections) will scale well. Although the cost of
establishing message protection on a particular connection may be high,
this cost is incurred infrequently, and only for rarely used connections.
For the common case, a frequently used connection will remain open
indefinitely, and therefore the setup overhead will be minimized.
-jkw
> --
> Jonathan K. Weedon: Architect
> VisiBroker, Borland AppServer
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