Mega Code Archive
Dynamic Pointcut Example
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/*
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();
pf.setTarget(target);
pf.addAdvisor(advisor);
SampleBean proxy = (SampleBean)pf.getProxy();
proxy.foo(1);
proxy.foo(10);
proxy.foo(100);
proxy.bar();
proxy.bar();
proxy.bar();
}
}
DynamicPointcutExample.zip( 1,481 k)
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