The realization mechanism of "sping revelation" 12 and SPRINGAOP

The implementation mechanism of SPRINGAOP

Design mode proxy mode

Refer to my previous proxy mode

Http://www.cnblogs.com/cutter-point/p/5226642.html

Here's a simple case.

 Package Spring.aop.designPattern; /** *  * Title:ISubject.java * Description: Proxy mode resource  interface class @author@version  1.0  */Publicinterface  isubject        {public void request ();}

 PackageSpring.aop.designPattern;/*** * * Title:SubjectImpl.java * Description: accessed by the visitor, or access to the resource implementation class *@authorxiaof * @date April 7, 2018 *@version1.0 **/ Public classSubjectimplImplementsIsubject {@Override Public voidrequest () {//TODO auto-generated Method StubSystem.out.println ("This is Subjectimpl cutter_point!")); }}

 PackageSpring.aop.designPattern;/*** * Title:SubjectProxy.java * Description: Proxy Implementation class *@authorxiaof * @date April 7, 2018 *@version1.0 **/ Public classSubjectproxyImplementsIsubject {PrivateIsubject subject; @Override Public voidrequest () {System.out.println ("Pre Operation Subjectproxy"); if(Subject! =NULL) subject.request (); System.out.println ("After Operation Subjectproxy"); }     Publicisubject Getsubject () {returnsubject; }     Public voidSetsubject (isubject subject) { This. Subject =subject; }    }

 Package Spring.aop.designPattern; Import org.junit.Test;  Public class Main {    @Test    publicvoid  test1 () {        new  Subjectimpl ();         New subjectproxy ();        Sp.setsubject (SI);                Sp.request ();    }}

Test a wave:

This is, for example, when we are going to proxy for Subjectimpl, we need to implement a proxy class object based on the Isubject interface.

Well, based on this point,

Disadvantage 1: If we do not have a class interface type, and is a third-party class object, such as we now have a subjectimpl2, this class does not implement the Isubject interface, then our Subjectimpl can also do proxy? It's obviously not possible.

Disadvantage 2: We find that a Subjectimpl object agent is to implement a proxy class Subjectproxy, if we have a project with a water object need to proxy, then we need to create 10,000 proxy class, OK, I will be crazy anyway ...

Dynamic Agent

The dynamic proxy for this JDK is primarily the proxy class and the Invocationhandler interface

 Package Spring.aop.designPattern; /** *  * Title:ISubject.java * Description: Proxy mode resource  interface class @author@version  1.0  */Publicinterface  isubject        {public void request ();}

 PackageSpring.aop.designPattern;/*** * * Title:SubjectImpl.java * Description: accessed by the visitor, or access to the resource implementation class *@authorxiaof * @date April 7, 2018 *@version1.0 **/ Public classSubjectimplImplementsIsubject {@Override Public voidrequest () {//TODO auto-generated Method StubSystem.out.println ("This is Subjectimpl cutter_point!")); }}

proxy class

 PackageSpring.aop.dynamicPorxy;ImportJava.lang.reflect.InvocationHandler;ImportJava.lang.reflect.Method;Importjava.util.Date;ImportSpring.aop.util.DateUtil;/*** * Title:RequestCtrlInvocationHandler.java * DESCRIPTION:JDK Dynamic proxy Object *@authorxiaof * @date April 7, 2018 *@version1.0 **/ Public classRequestctrlinvocationhandlerImplementsInvocationhandler {/*** Proxy Object*/    PrivateObject Target; /*** 00:00:00*/    PrivateString BeginTime; /*** 00:00:00*/    PrivateString EndTime;  PublicRequestctrlinvocationhandler (Object target, String beginTime, String endTime) { This. target =Target;  This. BeginTime =BeginTime;  This. EndTime =EndTime; } @Override PublicObject Invoke (Object proxy, Method method, object[] args)throwsThrowable {//determine if it is the request method, and if it is an interception operation        if(Method.getname (). Equals ("Request"))) {            //determine whether the current time is within the range, and if so, then do the corresponding operation            if(Dateutil.isindate (NewDate (), BeginTime, EndTime)) {System.out.println ("Time in interval, interception success"); returnMethod.invoke (target, args); } Else{System.err.println ("Out-of-band Time"); return NULL; }        }        returnMethod.invoke (target, args); }}

Final Test:

Current time!

Then we modify the time interval to see if there will be a different result!!!

0-12 pips

So let's change the time to 22.

Interception success

Not many BB, this is still a problem, unable to handle interface class problems

Dynamic byte-code generation

Using Cblib

 PackageSpring.aop.cglib;ImportJava.lang.reflect.Method;Importjava.util.Date;ImportOrg.apache.commons.logging.Log;Importorg.apache.commons.logging.LogFactory;ImportOrg.springframework.cglib.proxy.MethodInterceptor;ImportOrg.springframework.cglib.proxy.MethodProxy;ImportSpring.aop.util.DateUtil;/*** * Title:RequestCtrlCallback.java * Description: Dynamic Bytecode technology *@authorxiaof * @date April 7, 2018 *@version1.0 **/ Public classRequestctrlcallbackImplementsMethodinterceptor {Private Static FinalLog logger = Logfactory.getlog (requestctrlcallback.class); /*** 00:00:00*/    PrivateString BeginTime; /*** 00:00:00*/    PrivateString EndTime;  Publicrequestctrlcallback (String beginTime, String endTime) { This. BeginTime =BeginTime;  This. EndTime =EndTime; } @Override PublicObject Intercept (Object arg0, Method arg1, object[] arg2, Methodproxy arg3)throwsThrowable {//if we need to intercept the method, then do the appropriate action        if(Arg1.getname (). Equals ("Request"))) {            if(Dateutil.isindate (NewDate (), BeginTime, EndTime)) {                //within the corresponding time interval, the successfulLogger.info ("Successfully intercept the corresponding interval, release!") "); returnArg3.invokesuper (arg0, arg2); } Else{logger.error ("Error time interval!! "); return NULL; }        }                returnArg3.invokesuper (arg0, arg2); }     PublicString Getbegintime () {returnBeginTime; }     Public voidsetbegintime (String beginTime) { This. BeginTime =BeginTime; }     PublicString Getendtime () {returnEndTime; }     Public voidsetendtime (String endTime) { This. EndTime =EndTime; }}

 PackageSpring.aop.cglib;Importorg.junit.Test;ImportOrg.springframework.cglib.proxy.Enhancer;ImportSpring.aop.designPattern.SubjectImpl; Public classMain {@Test Public voidtest1 () {//using the Cglib proxy objectString beginTime = "00:00:00"; String EndTime= "20:00:00"; Enhancer Enhancer=Newenhancer (); //set proxy class objectEnhancer.setsuperclass (Subjectimpl.class); Enhancer.setcallback (NewRequestctrlcallback (BeginTime, endTime)); //Build Proxy ObjectSubjectimpl proxyobj =(Subjectimpl) enhancer.create ();    Proxyobj.request (); }}

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The realization mechanism of "sping revelation" 12 and SPRINGAOP