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RMI System Design: Patterns and Pitfalls	O'Reilly Conference On Enterprise Java
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Notification Flexibility

It may be impossible to predict exactly how your system is going to be used.
Example: EMail
Frequent polling can be used to simulate notification
A system can be future-proofed by allowing for an observer pattern internally, even if it is unused initially.

Last modified on 9 Feb 2002 by AO