package com.eyugame.modle;/** * 责任链模式 * * @author JYC506 * *//* 事件接收者 */public abstract class EventReceiver {private EventReceiver nextEventReceiver;public void setNextHandler(EventReceiver nextEventReceiver) {this.nextEventReceiver = nextEventReceiver;}public Response handleRequest(Request request) {if (this.isOk(request)) {return this.getResponse();} else {if (this.nextEventReceiver != null) {return this.nextEventReceiver.handleRequest(request);} else {System.out.println("没有合适的事件接收者");return null;}}}public abstract Response getResponse();protected abstract boolean isOk(Request request);public static void main(String[] args) {/* 创建一个请求 */Request request = new Request(Command.EVENT2);/* 非责任链模式下的代码 */if (request.getCommand() == Command.EVENT1) {new EventReceiver1().handleRequest(request);} else if (request.getCommand() == Command.EVENT2) {new EventReceiver2().handleRequest(request);} else if (request.getCommand() == Command.EVENT3) {new EventReceiver3().handleRequest(request);} else if (request.getCommand() == Command.EVENT4) {new EventReceiver4().handleRequest(request);}/* 责任链模式下的代码 *//* 是不是责任链模式比较清晰点，低耦合,不过比较耗内存，，因为都是提前并全部new出对象 */EventReceiver receiver1 = new EventReceiver1();EventReceiver receiver2 = new EventReceiver2();EventReceiver receiver3 = new EventReceiver3();EventReceiver receiver4 = new EventReceiver4();receiver1.setNextHandler(receiver2);receiver2.setNextHandler(receiver3);receiver3.setNextHandler(receiver4);receiver1.handleRequest(request);}}/*返回结果类*/class Response {}/* 请求 */class Request {Command command;public Request(Command command) {super();this.command = command;}public Command getCommand() {return command;}public void setCommand(Command command) {this.command = command;}}/* 请求命令 */enum Command {EVENT1, EVENT2, EVENT3, EVENT4}class EventReceiver1 extends EventReceiver {@Overridepublic Response getResponse() {System.out.println("事件处理者1处理并返回结果");return null;}@Overrideprotected boolean isOk(Request request) {return request.getCommand() == Command.EVENT1;}}class EventReceiver2 extends EventReceiver {@Overridepublic Response getResponse() {System.out.println("事件处理者2处理并返回结果");return null;}@Overrideprotected boolean isOk(Request request) {return request.getCommand() == Command.EVENT2;}}class EventReceiver3 extends EventReceiver {@Overridepublic Response getResponse() {System.out.println("事件处理者3处理并返回结果");return null;}@Overrideprotected boolean isOk(Request request) {return request.getCommand() == Command.EVENT3;}}class EventReceiver4 extends EventReceiver {@Overridepublic Response getResponse() {System.out.println("事件处理者4处理并返回结果");return null;}@Overrideprotected boolean isOk(Request request) {return request.getCommand() == Command.EVENT3;}}
感悟了不同的人生。凌晨，随着滑轮接触地面，
