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This pattern promotes the idea of [[loose coupling]].
The chain-of-responsibility pattern is structurally nearly identical to the [[decorator pattern]], the difference being that for the decorator, all classes handle the request, while for the chain of responsibility, exactly one of the classes in the chain handles the request. This is a strict definition of the Responsibility concept in the [[Design Patterns|GoF]] book. However, many implementations (such as loggers below, or UI event handling, or servlet filters in Java, etc
==Overview==
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