Designpattern_java:proxy Pattern

Agent mode proxy pattern delegate mode provide a surrogate or placeholder for another object to control access to it. Provides a proxy for other objects to control the visit to this object Ask. Abstract theme Role (Subject): This role is a common interface for real-world themes and proxy topics so that you can use the proxy theme wherever you can use real-world themes.

package com.DesignPattern.Structural.Proxy;public interface Subject {    // 定义一个请求方法    public void request();}

Proxy Subject: Also known as the Delegate class, the proxy class, which is responsible for controlling references to real topics, creating or deleting real-world subject objects when needed, and preprocessing and aftercare before and after real-world theme roles are processed.

package com.DesignPattern.Structural.Proxy;public class ProxySubject implements Subject {    private Subject subject;    public ProxySubject(Subject subject) {        this.subject = subject;    }    // 实现请求方法    @Override    public void request() {        this.beforeRequest();        subject.request();        this.afterRequest();    }    //请求前的操作    private void beforeRequest() {        // 预处理    }    //请求后的操作    private void afterRequest() {        // 善后处理    }}

Real Subject: This role is also called the delegated role, the agent role, and the specific performer of the business logic.

package com.DesignPattern.Structural.Proxy;public class RealSubject implements Subject {    @Override    public void request() {        // 业务处理逻辑        System.out.println("realSubject request");    }}

Example of proxy mode Igameplayer.java

package com.DesignPattern.Structural.Proxy;public interface IGamePlayer {    public void killBoss();// 杀怪    public void upGrade();// 升级}

Gameplayer.java

package com.DesignPattern.Structural.Proxy;public class GamePlayer implements IGamePlayer {    private String name = "";    public GamePlayer(String name) {        this.name = name;    }    @Override    public void killBoss() {        System.out.println(this.name + " killBoss");    }    @Override    public void upGrade() {        System.out.println(this.name + " upgrade level 1");    }}

Gameplayerproxy.java

package com.DesignPattern.Structural.Proxy;import java.util.Date;public class GamePlayerProxy implements IGamePlayer {    private IGamePlayer player=null;    public GamePlayerProxy(IGamePlayer player){        this.player=player;    }    //记录打怪时间    private void log(){        System.out.println("打怪时间"+new Date().toString());    }    @Override    public void killBoss() {        this.log();        player.killBoss();    }    @Override    public void upGrade() {        player.upGrade();        this.count();    }    //计算升级所用的时间    private void count(){        System.out.println("upgrade cost time!");    }}

Clientdemo.java

package com.DesignPattern.Structural.Proxy;public class ClientDemo {    public static void main(String[] args){        IGamePlayer player=new GamePlayer("Tom");        IGamePlayer proxy=new GamePlayerProxy(player);        proxy.killBoss();        proxy.upGrade();    }}

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Designpattern_java:proxy Pattern