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Chain Of Responsibility

Chain of Responsibility is a behavioral design pattern that lets you pass requests along a chain of handlers. Upon receiving a request, each handler decides either to process the request or to pass it to the next handler in the chain

the Chain of Responsibility relies on transforming particular behaviors into stand-alone objects called handlers.

Advantages of Chain of Responsibility

  1. Reduced coupling
  2. Added flexibility in assigning responsibilities to objects
  3. Receipt isn't guaranteed

Disadvantages

  1. Mostly, it can get broken easily: if a processor fails to call the next processor, the command gets dropped if a processor calls the wrong processor, it can lead to a cycle
  2. It can create deep stack traces, which can affect performance
  3. It can lead to duplicate code across processors, increasing maintenance

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RealWorld 1. DoFilter 2. Logger