We can implement our own proxy objects using spring.
public class ShapeServiceProxy extends ShapeService{
public Circle
getCircle() {
new
LoggingAspect().loggingAdvice();
return super.getCircle();
}
}
public class FactoryService {
public Object
getBean(String beanType){
if(beanType.equals("shapeServiceProxy")) return new ShapeServiceProxy();
if(beanType.equals("circle")) return new Circle();
if(beanType.equals("trianle")) return new Triangle();
return null;
}
}
AopMain.java
package org.yash.watertechsol;
import org.yash.watertechsol.service.FactoryService;
import org.yash.watertechsol.service.ShapeService;
public class AopMain {
public static void main(String
args[]){
//ApplicationContext
ctx = new ClassPathXmlApplicationContext("spring.xml");
//ShapeService
shapeService = ctx.getBean("shapeService", ShapeService.class);
FactoryService factoryService = new
FactoryService();
//ShapeService
shapeService = (ShapeService) factoryService.getBean("shapeService");
ShapeService
shapeService = (ShapeService) factoryService.getBean("shapeServiceProxy");
shapeService.getCircle();
}
}
Circle.java
package org.yash.watertechsol.model;
public class Circle {
private String name;
public String
getName() {
return name;
}
public void setName(String
name) {
this.name = name;
System.out.println("Circle
Setter is called");
throw(new
RuntimeException());
}
public String
setNameandReturn(String name) {
this.name = name;
System.out.println("Circle
Setter is called");
return name;
}
}
Triangle.java
package org.yash.watertechsol.model;
public class Triangle {
private String name;
public void setName(String
name) {
this.name = name;
}
public String
getName() {
return name;
}
}
ShapeService.java
package org.yash.watertechsol.service;
import org.yash.watertechsol.model.Circle;
import org.yash.watertechsol.model.Triangle;
public class ShapeService {
private Triangle triangle;
private Circle circle;
public Circle
getCircle() {
System.out.println("Circle
getter called");
return circle;
}
public void
setCircle(Circle circle) {
this.circle = circle;
}
public Triangle
getTriangle() {
return triangle;
}
public void
setTriangle(Triangle triangle) {
this.triangle = triangle;
}
}
LoggingAspect.java
package org.yash.watertechsol.aspect;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Aspect;
@Aspect
public class LoggingAspect {
public Object myAroundAdvice(ProceedingJoinPoint
pjp){
Object
returnValue = null;
try {
System.out.println("Before
Advice");
returnValue
= pjp.proceed();
System.out.println("After
Returning");
} catch (Throwable e) {
System.out.println("AfterThrowing");
} // this is
place where actual method execution happens
System.out.println("After
Finally");
return returnValue;
}
public void loggingAdvice(){
System.out.println("Logging
from the advice");
}
}
FactoryService.java
package org.yash.watertechsol.service;
import org.yash.watertechsol.model.Circle;
import org.yash.watertechsol.model.Triangle;
public class FactoryService {
public Object
getBean(String beanType){
if(beanType.equals("shapeServiceProxy")) return new ShapeServiceProxy();
if(beanType.equals("circle")) return new Circle();
if(beanType.equals("trianle")) return new Triangle();
return null;
}
}
ShapeServiceProxy.java
package org.yash.watertechsol.service;
import org.yash.watertechsol.aspect.LoggingAspect;
import org.yash.watertechsol.model.Circle;
public class ShapeServiceProxy extends ShapeService{
public Circle
getCircle() {
new
LoggingAspect().loggingAdvice();
return super.getCircle();
}
}
spring.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:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd">
<aop:aspectj-autoproxy />
<bean id="triangle"
class="org.yash.watertechsol.model.Triangle">
<property name="name"
value="Triangle Name"></property>
</bean>
<bean id="circle"
class="org.yash.watertechsol.model.Circle">
</bean>
<bean id="shapeService"
class="org.yash.watertechsol.service.ShapeService"
autowire="byName"/>
<bean id="loggingAspect"
class="org.yash.watertechsol.aspect.LoggingAspect"/>
<aop:config>
<aop:aspect id="loggingAspecta"
ref ="loggingAspect">
<!--
<aop:pointcut
id="allGetters" expression="execution(* get*())"/>
<aop:around
method="myAroundAdvice" pointcut-ref="allGetters"/>
-->
<aop:around method="myAroundAdvice"
pointcut="execution(* get*())"/>
</aop:aspect>
</aop:config>
</beans>
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