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Ilkka Seppälä 2014-08-24 20:28:33 +03:00
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##Chain of responsibility
**Intent:** Avoid coupling the sender of a request to its receiver by giving more than one object a chance to handle the request. Chain the receiving objects and pass the request along the chain until an object handles it.
![alt text](https://github.com/iluwatar/java-design-patterns/blob/master/chain/etc/chain.jpg "Chain of Responsibility")
**Applicability:** Use Chain of Responsibility when
* more than one object may handle a request, and the handler isn't known a priori. The handler should be ascertained automatically
* you want to issue a request to one of several objects without specifying the receiver explicitly
* the set of objects that can handle a request should be specified dynamically
##Command
**Intent:** Encapsulate a request as an object, thereby letting you parameterize clients with different requests, queue or log requests, and support undoable operations.