Chain of Responsibility

The Chain of Responsibility design pattern avoids coupling the sender of a request to its receiver by giving more than one object a chance to handle the request. This pattern chains the receiving objects and passes the request along the chain until an object handles it.

Usage          Medium-low

UML class diagram

A visualization of the classes and objects participating in this pattern.

Sample code

This structural code demonstrates the Chain of Responsibility pattern in which several linked objects (the Chain) are offered the opportunity to respond to a request or hand it off to the object next in line.

Output

See also

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• Common Design Patterns
• Design Guidelines
• Documentation