java 实现 责任链模式
时间: 2024-04-11 15:22:11 浏览: 14
Java可以通过实现责任链模式来实现请求的处理。责任链模式是一种行为设计模式,它允许将请求沿着处理链进行传递,直到有一个处理者能够处理该请求。每个处理者都可以决定是否将请求传递给下一个处理者,从而形成一条处理链。Tamarack是一个用Java实现责任链模式的微框架,它通过为多个对象提供处理请求的机会,避免将请求的发送者与其接收者耦合。链接接收对象并沿链传递请求,直到对象处理它。
代码实现如下(Java):
```java
public abstract class Handler {
protected Handler successor;
public void setSuccessor(Handler successor) {
this.successor = successor;
}
public abstract void handleRequest(Request request);
}
public class ConcreteHandler1 extends Handler {
public void handleRequest(Request request) {
if (request.getType() == RequestType.TYPE1) {
System.out.println(request.getName() + " is handle by ConcreteHandler1");
return;
}
if (successor != null) {
successor.handleRequest(request);
}
}
}
public class ConcreteHandler2 extends Handler {
public void handleRequest(Request request) {
if (request.getType() == RequestType.TYPE2) {
System.out.println(request.getName() + " is handle by ConcreteHandler2");
return;
}
if (successor != null) {
successor.handleRequest(request);
}
}
}
public class Request {
private String name;
private RequestType type;
public Request(String name, RequestType type) {
this.name = name;
this.type = type;
}
public String getName() {
return name;
}
public RequestType getType() {
return type;
}
}
public enum RequestType {
TYPE1, TYPE2
}
public class ChainOfResponsibilityDemo {
public static void main(String[] args) {
Handler h1 = new ConcreteHandler1();
Handler h2 = new ConcreteHandler2();
h1.setSuccessor(h2);
Request request1 = new Request("Request1", RequestType.TYPE1);
h1.handleRequest(request1);
Request request2 = new Request("Request2", RequestType.TYPE2);
h1.handleRequest(request2);
}
}
```