The ______ Pattern is a design pattern where a request is passed through a chain of handlers, each deciding whether to process it or pass it to the next handler. It's used for tasks like event handling and logging.
* Command
* Interpreter
* Chain of Responsibility
* Pipeline
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Answer: Chain of Responsibility
The Chain of Responsibility Pattern is a behavioral design pattern in software development that allows you to pass requests along a chain of handlers. Each handler decides whether to process the request or pass it to the next handler in the chain. It's commonly used for handling tasks such as event processing, logging, or validation.
Key components of the Chain of Responsibility Pattern:
Handler: Handlers are objects that are part of the processing chain. They contain logic to process requests and decide whether they can handle a particular request or should pass it to the next handler in the chain.
Successor: Each handler typically has a reference to the next handler (its successor) in the chain. If a handler can't process a request, it delegates the request to its successor.
Client: The client initiates requests and sends them to the first handler in the chain. The client is unaware of the specific handlers in the chain and doesn't need to know which one will ultimately process the request.
The Chain of Responsibility Pattern promotes flexibility and extensibility by allowing you to add or remove handlers from the chain without affecting the client code. It also enhances code reusability by encapsulating request-handling logic within individual handlers.