Dynamic Pointcut Example : Spring Aspect « Spring « Java

Dynamic Pointcut Example

Pro Spring
By Rob Harrop
Jan Machacek
ISBN: 1-59059-461-4
Publisher: Apress

public class SampleBean {

    public void foo(int x) {
        System.out.println("Invoked foo() with: "  +x);
    public void bar() { 
        System.out.println("Invoked bar()");

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;

public class SimpleAdvice implements MethodInterceptor {

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


import java.lang.reflect.Method;

import org.springframework.aop.ClassFilter;
import org.springframework.aop.support.DynamicMethodMatcherPointcut;

public class SimpleDynamicPointcut extends DynamicMethodMatcherPointcut {

    public boolean matches(Method method, Class cls) {
        System.out.println("Static check for " + method.getName());
        return ("foo".equals(method.getName()));

    public boolean matches(Method method, Class cls, Object[] args) {
        System.out.println("Dynamic check for " + method.getName());

        int x = ((Integer) args[0]).intValue();

        return (x != 100);

    public ClassFilter getClassFilter() {
        return new ClassFilter() {

            public boolean matches(Class cls) {
                return (cls == SampleBean.class);
import org.springframework.aop.Advisor;
import org.springframework.aop.framework.ProxyFactory;
import org.springframework.aop.support.DefaultPointcutAdvisor;

public class DynamicPointcutExample {

    public static void main(String[] args) {
        SampleBean target = new SampleBean();

        // create advisor
        Advisor advisor = new DefaultPointcutAdvisor(
                new SimpleDynamicPointcut(), new SimpleAdvice());
        // create proxy
        ProxyFactory pf = new ProxyFactory();
        SampleBean proxy = (SampleBean)pf.getProxy();


DynamicPointcutExample.zip( 1,481 k)

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