Spring Framework

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Spring Project 1

Example of NameMatchMethodPointcut
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Introduction: This pointcut implementation uses method name as criteria of finding out the applicability of advices. The pointcut simply specify a which method of a bean can be advice is does not specified the advices. Advices are associated to pointcut with the help of aspect implementation of aspect is called advisor in Spring AOP implementation framework provide predefine advisor. Most commonly used one these are before pointcut advisor.

Technology use to run this source code

  1. Spring 2.5 jar files
  2. Eclipse IDE
  3. Tomcat Server

Source Code:

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
<bean id="t" class="org.r4r.One"/>
<bean id="a1" class="org.r4r.BeforeAdvisor"/>
<bean id="a2" class="org.r4r.AfterAdvisor"/>
<bean id="pc1" class="org.springframework.aop.support.NameMatchMethodPointcut">
<property name="mappedName" value="a"/>
</bean>
<bean id="pc2" class="org.springframework.aop.support.NameMatchMethodPointcut">
<property name="mappedName" value="b"/>
</bean>
<bean id="ad1" class="org.springframework.aop.support.DefaultPointcutAdvisor">
<property name="advice" ref="a1"/>
<property name="pointcut" ref="pc1"/>
</bean>
<bean id="ad2" class="org.springframework.aop.support.DefaultPointcutAdvisor">
<property name="advice" ref="a2"/>
<property name="pointcut" ref="pc2"/>
</bean>
<bean id="proxy" class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="target" ref="t"/>
<property name="interceptorNames">
<list>
<value>ad1</value>
<value>ad2</value></list>
</property>
</bean>
</beans>

 

AB.java

package org.r4r;
public interface AB {
public void a();
public void b();

}

One.java

package org.r4r;
public class One implements AB {
@Override
public void a() {
System.out.println("a() of one invoked");
}
@Override
public void b() {
System.out.println("b() of one invoked");
}
}

AfterAdvisor.java

package org.r4r;
import java.lang.reflect.Method;
import org.springframework.aop.AfterReturningAdvice;
public class AfterAdvisor implements AfterReturningAdvice {
@Override
public void afterReturning(Object arg0, Method arg1, Object[] arg2,
Object arg3) throws Throwable {
System.out.println("After advisor is provide service..");
}
}

BeforeAdvisor.java

package org.r4r;
import java.lang.reflect.Method;
import org.springframework.aop.MethodBeforeAdvice;
public class BeforeAdvisor implements MethodBeforeAdvice {
@Override
public void before(Method arg0, Object[] arg1, Object arg2)
throws Throwable {
System.out.println("Before advice is applied..");
}
}

ProxyTest.java

package org.r4r;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
public class ProxyTest {
public static void main(String[] args) {
Resource r=new ClassPathResource("applicationContext.xml");
BeanFactory f=new XmlBeanFactory(r);
AB proxy=(AB)f.getBean("proxy");
System.out.println("Proxy obtained invoking a().");
proxy.a();
System.out.println("Proxy obtained invoking b()");
proxy.b();
}
}

output:

Proxy obtained invoking a().
Before advice is applied..
a() of one invoked
Proxy obtained invoking b()
b() of one invoked
After advisor is provide service..
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