How to implement the Chain of Responsibility pattern in…

In Go language, the chain of responsibility pattern can be implemented using interfaces and structs.

Firstly, we need to define an interface that specifies the methods for handling requests.

type Handler interface {
    SetNext(handler Handler)
    HandleRequest(request string)
}

Next, we can implement a specific processor structure that implements the Handler interface.

type ConcreteHandler struct {
    nextHandler Handler
}

func (ch *ConcreteHandler) SetNext(handler Handler) {
    ch.nextHandler = handler
}

func (ch *ConcreteHandler) HandleRequest(request string) {
    // 处理请求的逻辑
    if request == "some condition" {
        // 处理请求的代码
    } else if ch.nextHandler != nil {
        // 将请求传递给下一个处理器
        ch.nextHandler.HandleRequest(request)
    }
}

Finally, we can create a chain of processors to pass the request to the first processor.

func main() {
    handler1 := &ConcreteHandler{}
    handler2 := &ConcreteHandler{}
    handler3 := &ConcreteHandler{}

    handler1.SetNext(handler2)
    handler2.SetNext(handler3)

    handler1.HandleRequest("some request")
}

In this way, when the HandleRequest method of handler1 is called, if a certain condition is met, the request will be processed; otherwise, the request will be passed to the next handler, until a handler is able to process the request.