java-design-patterns/chain-of-responsibility/index.md

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layout	title	folder	permalink	categories	tags
pattern	Chain of responsibility	chain-of-responsibility	/patterns/chain-of-responsibility/	behavioral	pattern_tag

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.

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

Real world examples:

• java.util.logging.Logger#log()
• Apache Commons Chain