Chain of Responsibility Pattern
The Chain of Responsibility is a behavioral design pattern that allows passing requests along a chain of handlers. Each handler decides either to process the request or to pass it to the next handler in the chain, promoting loose coupling between senders and receivers. It is commonly used in event handling systems, logging frameworks, and middleware pipelines.
Developers should use this pattern when they need to decouple the sender of a request from its receiver, allowing multiple objects to handle the request without the sender knowing which one will process it. It is particularly useful for implementing logging, authentication, or validation chains where requests must pass through a series of checks or transformations, such as in web middleware or GUI event propagation.