proxysubject.java

来自「《Java与模式》一书的源代码」· Java 代码 · 共 35 行

package com.javapatterns.proxy;

public class ProxySubject extends Subject
{
    private RealSubject realSubject;

    public ProxySubject()
    {
    }

    public void request()
    {
        preRequest();

        if (realSubject == null)
        {
            realSubject = new RealSubject();
        }

        realSubject.request();

        postRequest();
    }

    private void preRequest()
    {
        //something you want to do before requesting
    }

    private void postRequest()
    {
        //something you want to do after requesting
    }
}