Learn reflex with teacher Wang (10): Static proxy mode

Learn reflex with teacher Wang (10): Static proxy mode teacher: Wang Shaohua QQ Group: 483773664 Learning Content

Understanding the proxy mechanism

Mastering static Proxies

First, the concept of Agent mode

A proxy mode is a proxy theme that operates on real topics, real-world topics that perform specific business operations, and agents that are responsible for other related business processes.

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Proxy mode typically involves three roles

Abstract role: Common interface for declaring real objects and proxy objects

Proxy role: The proxy object role contains a reference to the real object, allowing you to manipulate the real object, while the proxy object provides the same interface as the real object to replace the real object at any time with the same interface so that the real object can be substituted at any moment. At the same time, when the proxy object can perform the real object operation, additional actions are attached, which is equivalent to the object's real object encapsulation

Real role: The real object represented by the proxy role is the object we end up applying

Second, proxy mode implementation:

Demand:

Normal business, print output HelloWorld

The ability to add print logs, that is, before and after normal business methods, to write to the log

(i) abstract role

1234	publicinterface UserService {    //用于实现业务的方法    public voidsave();}

(ii) Real role

123456

public class userserviceimpl implements userservice{      Code class= "Java Color1" > @Override      public void save () {               } }

(iii) Agent role

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public class UserServiceProxy implements UserService{    //代理角色内部要有真实角色的引用    private UserServiceImpl realRole = new UserServiceImpl();    @Override    public void save() {        preHandle();        realRole.save();        postHandle();    }    /**     * 代理类特有的方法     */    private void preHandle(){        System.out.println("preHandle");    }    /**     * 代理类特有的方法     */    private void postHandle(){        System.out.println("postHandle");    }}

(iv) Use of proxy classes

123456

public class proxytest {      public static void main (string[] args) {           userservice userservice = new  Userserviceproxy ();          userservice.save ();      } }

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Third, static proxy

The above code demonstrates the static proxy, which means that the proxy class is created by the programmer, that is, the proxy class already exists before the program is run.

This proxy way, the disadvantage is very obvious:

1) The proxy class and the delegate class implement the same interface, and the proxy class implements the same method through the delegate class. There is a lot of code duplication. If an interface adds a method, all proxy classes need to implement this method in addition to all implementation classes that need to implement this method. Increases the complexity of code maintenance.

2) The proxy object serves only one type of object if it is to serve multiple types of objects. is bound to for each kind of object is agent, static agent in the program size is a little too large to be competent

So how to avoid the lack of static agents, then we can use dynamic agents, next lesson we will learn how to use dynamic Proxy

From for notes (Wiz)

Learn reflex with teacher Wang (10): Static proxy mode