Source Code : Proxy Factory Bean Example

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Proxy Factory Bean Example

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



///////////////////////////////////////////////////////////////////////////////////////
//File:pfb.xml
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
    <bean id="myBean1" class="MyBean">
        <property name="dep">
            <ref local="myDependency1"/>
        </property>
    </bean>
    
    <bean id="myBean2" class="MyBean">
        <property name="dep">
            <ref local="myDependency2"/>
        </property>
    </bean>
    
    <bean id="myDependencyTarget" class="MyDependency"/>
    
    <bean id="myDependency1" class="org.springframework.aop.framework.ProxyFactoryBean">
        <property name="target">
            <ref local="myDependencyTarget"/>
        </property>
        <property name="interceptorNames">
            <list>
                <value>advice</value>
            </list>
        </property>
    </bean>
    
    <bean id="myDependency2" class="org.springframework.aop.framework.ProxyFactoryBean">
        <property name="target">
            <ref local="myDependencyTarget"/>
        </property>
        <property name="interceptorNames">
            <list>
                <value>advisor</value>
            </list>
        </property>
    </bean>
    
    <bean id="advice" class="MyAdvice"/>
    
    <bean id="advisor" class="org.springframework.aop.support.DefaultPointcutAdvisor">
        <property name="advice">
            <ref local="advice"/>
        </property>
        <property name="pointcut">
            <bean class="org.springframework.aop.support.JdkRegexpMethodPointcut">
                <property name="pattern">
                    <value>.*foo.*</value>
                </property>
            </bean>
        </property>
    </bean>
</beans>


///////////////////////////////////////////////////////////////////////////////////////

import java.lang.reflect.Method;

import org.springframework.aop.MethodBeforeAdvice;

public class MyAdvice implements MethodBeforeAdvice {

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

}

///////////////////////////////////////////////////////////////////////////////////////
public class MyBean {

    private MyDependency dep;
    
    public void execute() {
        dep.foo();
        dep.bar();
    }
    
    public void setDep(MyDependency dep) {
        this.dep = dep;
    }
}



///////////////////////////////////////////////////////////////////////////////////////

public class MyDependency {

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


///////////////////////////////////////////////////////////////////////////////////////

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;

public class ProxyFactoryBeanExample {

    public static void main(String[] args) {
        ApplicationContext ctx = new FileSystemXmlApplicationContext(
                "build/pfb.xml");
        
        MyBean bean1 = (MyBean)ctx.getBean("myBean1");
        MyBean bean2 = (MyBean)ctx.getBean("myBean2");
        
        System.out.println("Bean 1");
        bean1.execute();
        
        System.out.println("
Bean 2");
        bean2.execute();
    }
}

           
       

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