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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 GoF book ...
In object-oriented programming, the command pattern is a behavioral design pattern in which an object is used to encapsulate all information needed to perform an action or trigger an event at a later time. This information includes the method name, the object that owns the method and values for the method parameters.
Chain of responsibility delegates commands to a chain of processing objects. Command creates objects that encapsulate actions and parameters. Interpreter implements a specialized language. Iterator accesses the elements of an object sequentially without exposing its underlying representation.
Chain-of-responsibility pattern Command objects are handled or passed on to other objects by logic-containing processing objects Command pattern Command objects encapsulate an action and its parameters "Externalize the stack" Turn a recursive function into an iterative function that uses a stack [1] Interpreter pattern
Forwarding is used in many design patterns. [2] Forwarding is used directly in several patterns: Chain-of-responsibility pattern; Decorator pattern: decorator object adds its own members, forwarding others to the decorated object. Proxy pattern: proxy object forwards member use to real object.
Then the chain stops. This is stated at the top of page 224 of the Design Patterns book. The example for Java shows each item on the chain being able to perform some example. So I don't think it is an actual example of a 'pure' chain of responsibility. Pcraven 20:10, 11 February 2007 (UTC) I agree with Pcraven.
In Java, the final keyword can be used to prevent a class from being subclassed. ... Behavioral patterns (11): Chain-of-responsibility pattern, Command pattern, ...
Extensibility pattern: a.k.a. Framework - hide complex code behind a simple interface; Facade pattern: create a simplified interface of an existing interface to ease usage for common tasks; Flyweight pattern: a large quantity of objects share a common properties object to save space; Marker pattern: an empty interface to associate metadata with ...