Chain of Responsibility

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Pass requests along a chain of handlers (middleware). 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 one handles it.

Key Properties

• Handler Chain
• Request Propagation
• Default Handling

Related

• Middleware Pipeline (modern application)
• Decorator (similar chaining structure)
• Command (encapsulated requests)

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design-patterns behavioral chain-of-responsibility