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

Peers register with each other; clients register with a server
Registration indicates interest in future changes
When changes occur, the server (or peer with the change) invokes a handler method on the registered listeners
When number of updates is low, or participants want to know of every change, it's appropriate

Last modified on 9 Feb 2002 by AO