Java Tutorial/Spring/ProxyFactory

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Add Advice To ProxyFactory

File: Main.java



   <source lang="java">

import org.aopalliance.intercept.MethodInterceptor; import org.aopalliance.intercept.MethodInvocation; import org.springframework.aop.framework.ProxyFactory; public class Main {

 public static void main(String[] args) throws Exception {
   MessageWriter target = new MessageWriter();
   ProxyFactory pf = new ProxyFactory();
   pf.addAdvice(new MessageDecorator());
   pf.setTarget(target);
   MessageWriter proxy = (MessageWriter) pf.getProxy();
   target.writeMessage();
   System.out.println("");
   proxy.writeMessage();
 }

} class MessageWriter {

 public void writeMessage() {
     System.out.print("A");
 }

} class MessageDecorator implements MethodInterceptor {

 public Object invoke(MethodInvocation invocation) throws Throwable {
     System.out.print("B ");
     Object retVal = invocation.proceed();
     System.out.println("C");
     return retVal;
 }

}</source>





Invoke Method Through Proxy

File: Main.java



   <source lang="java">

import java.lang.reflect.Method; import org.springframework.aop.Advisor; import org.springframework.aop.MethodBeforeAdvice; import org.springframework.aop.Pointcut; import org.springframework.aop.framework.ProxyFactory; import org.springframework.aop.support.ControlFlowPointcut; import org.springframework.aop.support.DefaultPointcutAdvisor; public class Main {

 public static void main(String[] args) {
   TestBean target = new TestBean();
   Pointcut pc = new ControlFlowPointcut(Main.class, "test");
   Advisor advisor = new DefaultPointcutAdvisor(pc, new SimpleBeforeAdvice());
   ProxyFactory pf = new ProxyFactory();
   pf.setTarget(target);
   pf.addAdvisor(advisor);
   TestBean proxy = (TestBean) pf.getProxy();
   proxy.foo();
   test(proxy);
 }
 static void test(TestBean bean) {
   bean.foo();
 }

} class TestBean {

 public void foo() {
   System.out.println("foo");
 }

} class SimpleBeforeAdvice implements MethodBeforeAdvice {

 public void before(Method method, Object[] args, Object target) throws Throwable {
   System.out.println("Before method " + method);
 }

}</source>





Proxy Factory Add Advisor

File: Main.java



   <source lang="java">

import java.lang.reflect.Method; import org.aopalliance.aop.Advice; import org.aopalliance.intercept.MethodInterceptor; import org.aopalliance.intercept.MethodInvocation; import org.springframework.aop.Advisor; import org.springframework.aop.ClassFilter; import org.springframework.aop.Pointcut; import org.springframework.aop.framework.ProxyFactory; import org.springframework.aop.support.DefaultPointcutAdvisor; import org.springframework.aop.support.StaticMethodMatcherPointcut; public class Main {

 public static void main(String[] args) {
   BeanOne one = new BeanOne();
   BeanTwo two = new BeanTwo();
   BeanOne proxyOne;
   BeanTwo proxyTwo;
   Pointcut pc = new SimpleStaticPointcut();
   Advice advice = new SimpleAdvice();
   Advisor advisor = new DefaultPointcutAdvisor(pc, advice);
   ProxyFactory pf = new ProxyFactory();
   pf.addAdvisor(advisor);
   pf.setTarget(one);
   proxyOne = (BeanOne) pf.getProxy();
   pf = new ProxyFactory();
   pf.addAdvisor(advisor);
   pf.setTarget(two);
   proxyTwo = (BeanTwo) pf.getProxy();
   proxyOne.foo();
   proxyTwo.foo();
   proxyOne.bar();
   proxyTwo.bar();
 }

} class BeanTwo {

 public void foo() {
   System.out.println("BeanTwo.foo");
 }
 public void bar() {
   System.out.println("BeanTwo.bar");
 }

} class BeanOne {

 public void foo() {
   System.out.println("BeanOne.foo");
 }
 public void bar() {
   System.out.println("BeanOne.bar");
 }

} class SimpleAdvice implements MethodInterceptor {

 public Object invoke(MethodInvocation invocation) throws Throwable {
   System.out.println("SimpleAdvice.Invoking " + invocation.getMethod().getName());
   Object retVal = invocation.proceed();
   System.out.println("SimpleAdvice.Done");
   return retVal;
 }

} class SimpleStaticPointcut extends StaticMethodMatcherPointcut {

 public boolean matches(Method method, Class cls) {
   return ("foo".equals(method.getName()));
 }
 public ClassFilter getClassFilter() {
   return new ClassFilter() {
     public boolean matches(Class cls) {
       return (cls == BeanOne.class);
     }
   };
 }

}</source>