17_AOP Getting Started _salay case (leveraging dynamic proxies)

"Case Study"

View Salary:

1. Start the log

2. Start the security framework

3. Check permissions: If you have permission to view wages, see pay, otherwise prompt "Insufficient permissions"

Factory

"Salarymanager.java"

 Package com. HigginCui.proxy.salary; // Target Interface  Public Interface Salarymanager {    // View Payroll public    void  showsalary ();}

"Salarymanagerimpl.java"

 Package com. HigginCui.proxy.salary; // Target Class  Public class Implements salarymanager{    @Override    publicvoid  showsalary () {        System.out.println ("Show Salary ...");}    }

"Logger.java"

 Package com. HigginCui.proxy.salary; // Log Class  Public class Logger {    publicvoid  logging () {        System.out.println ("Logging ...") );    }}

"Privilege.java"

 Package com. HigginCui.proxy.salary; // Permission Class  Public class Privilege {    private  String access;      Public String getaccess () {        return  access;    }      Public void setaccess (String access) {        this. Access = access;    }} 

"Security.java"

 Package com. HigginCui.proxy.salary; // Security Framework Classes  Public class Security {    publicvoid  Security () {        System.out.println ("Security ... ");    }}

"Salarymanagerinterceptor.java"

 Packagecom. HigginCui.proxy.salary;ImportJava.lang.reflect.InvocationHandler;ImportJava.lang.reflect.Method;//Interception Device Public classSalarymanagerinterceptorImplementsinvocationhandler{PrivateObject Target; PrivateLogger Logger; Privatesecurity security; PrivatePrivilege Privilege;  Publicsalarymanagerinterceptor (Object target,logger logger,security security,privilege Privilege) { This. target=Target;  This. logger=logger;  This. security=security;  This. privilege=privilege; } @Override Publicobject Invoke (Object proxy, Method method, object[] args)throwsThrowable {//1. Turn on the log         This. logger.logging (); //2. Turn on the security framework class         This. security.security (); //3. Check permissions, if "admin", allow view, otherwise prompt "Insufficient permissions"        if( This. privilege.getaccess (). Equals ("admin")){            //4. Calling the target methodMethod.invoke (target, args); }Else{System.out.println ("Insufficient permissions ..."); }        return NULL; }}

"Salarytest.java"

 Packagecom. Higgincui.test;ImportJava.lang.reflect.Proxy;Importorg.junit.Test;Importcom. HigginCui.proxy.salary.Logger;Importcom. HigginCui.proxy.salary.Privilege;Importcom. HigginCui.proxy.salary.SalaryManager;Importcom. HigginCui.proxy.salary.SalaryManagerImpl;Importcom. HigginCui.proxy.salary.SalaryManagerInterceptor;Importcom. HigginCui.proxy.salary.Security;//Impersonate a client Public classsalarytest {@Test Public voidTestsalart () {Object target=NewSalarymanagerimpl (); Logger Logger=NewLogger (); Security Security=NewSecurity (); Privilege Privilege=NewPrivilege (); /** If "admin", Prompt "Show Salary ..." * Otherwise, prompt "Insufficient permissions"*/privilege.setaccess ("Admin"); Salarymanagerinterceptor Interceptor=NewSalarymanagerinterceptor (target, logger, security, privilege); Salarymanager Proxy=(Salarymanager) proxy.newproxyinstance (Target.getclass (). getClassLoader (), Target.getclass (). Getinterfaces (), Interceptor)        ;    Proxy.showsalary (); }}

"Run Results"

Logging ... security ... Show Salary ...

17_AOP Getting Started _salay case (leveraging dynamic proxies)