Linux日志：rsyslog及loganalyzer（一）

一． 静态代理
1． Subject.java

package com.test;

public abstract class Subject {
public abstract void request();
}

2． RealSubject.java

package com.test;

public class RealSubject extends Subject {

@Override
public void request() {
System.out.println("real subject");
}

}

3． ProxySubject.java

package com.test;

public class ProxySubject extends Subject {

private RealSubject realSubject;

@Override
public void request() {
this.PreRequest();
if(realSubject==null){
realSubject=new RealSubject();
}
realSubject.request();
this.PostRequest();
}

private void PreRequest(){
System.out.println("pre request");
}

private void PostRequest(){
System.out.println("post request");
}

}

4． Client.java

package com.test;

public class Client {

/**
* @param args
*/
public static void main(String[] args) {
Subject proxy=new ProxySubject();
proxy.request();
}

}

二． 动态代理
1. Subject.java

package com.test.dynamicproxy;

public interface Subject {
public void request();
}

2. RealSubject.java

package com.test.dynamicproxy;

public class RealSubject implements Subject {

@Override
public void request() {
System.out.println("from real subject");
}

}

3. ProxySubject.java

package com.test.dynamicproxy;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

public class ProxySubject implements InvocationHandler {

private Object object;

public ProxySubject(Object object){
this.object=object;
}

@Override
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
System.out.println("pre process");
method.invoke(object, args);
System.out.println("post process");
return null;
}

}

4. Client.java

package com.test.dynamicproxy;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;

public class Client {

/**
* @param args
*/
public static void main(String[] args) {

RealSubject realSubject=new RealSubject();

InvocationHandler handler=new ProxySubject(realSubject);

Class<?> clz=realSubject.getClass();

Subject subject=(Subject)Proxy.newProxyInstance(clz.getClassLoader(), clz.getInterfaces(), handler);

subject.request();
}

}