Java Tutorial/Spring/ProxyFactory
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>