Spring AOP

Spring AOP JoinPoint and Advice Arguments

Spring JoinPoint and Advice Arguments

Join point: A point during the execution of a program, such as the execution of a method or the handling of an exception. In Spring AOP, a join point always represents a method execution. Join point information is available in advice bodies by declaring a parameter of type org.aspectj.lang.JoinPoint.

 

We’ll now learn about join points, and how we can use arguments in the advice methods to get information about join points.

package com.dineshonjava.sdnext.aop.tutorial.aspectJ;

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

import com.dineshonjava.sdnext.aop.tutorial.aspectJ.service.ShapeService;

public class AopTest {

    public static void main(String args[])
    {
        ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
        ShapeService service=context.getBean("shapeService",ShapeService.class);
        service.getCircle().setName("Dummy Circle");
        System.out.println(service.getCircle().getName());
    }
}
package com.dineshonjava.sdnext.aop.tutorial.aspectJ;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;

import com.dineshonjava.sdnext.aop.tutorial.aspectJ.model.Circle;

@Aspect
public class LoggingAspect {
   
    @Before("allCircleMethods()")
    public void loggingAdvice(JoinPoint joinpoint)
    {
        System.out.println("Run Advice..... get method Executed");
        System.out.println(joinpoint.toString());
        Circle c=(Circle)joinpoint.getTarget();
        System.out.println(c.getName());
    }
   
//    @Before("args(name)")
//    public void allStringMethodArguments(String name){
//       
//        System.out.println("A setter method has been executed............"+name);
//    }
   
    @Before("args(String)")
    public void allStringMethodArguments(){
   
    System.out.println("A setter method has been executed............");
    }
      
    @Pointcut("within(com.venkat.Spring.Aop.model.*)")
    public void allCircleMethods(){}
  }

 

package com.dineshonjava.sdnext.aop.tutorial.aspectJ.model;

public class Circle {

    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

 

package com.dineshonjava.sdnext.aop.tutorial.aspectJ.model;

public class Triangle {

    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

 

package com.dineshonjava.sdnext.aop.tutorial.aspectJ.service;

import com.dineshonjava.sdnext.aop.tutorial.aspectJ.model.Circle;
import com.dineshonjava.sdnext.aop.tutorial.aspectJ.model.Triangle;

public class ShapeService {

    private Triangle triangle;
    private Circle circle;
    public Triangle getTriangle() {
        return triangle;
    }
    public void setTriangle(Triangle triangle) {
        this.triangle = triangle;
    }
    public Circle getCircle() {
        return circle;
    }
    public void setCircle(Circle circle) {
        this.circle = circle;
    }
}

 

<beans xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" 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 class="com.dineshonjava.sdnext.aop.tutorial.aspectJ.model.Triangle" name="triangle">
    <property name="name" value="triangle name">
    </property></bean>
    <bean class="com.dineshonjava.sdnext.aop.tutorial.aspectJ.model.Circle" name="circle">
    <property name="name" value="circle name">
    </property></bean>
    <bean class="com.dineshonjava.sdnext.aop.tutorial.aspectJ.service.ShapeService" name="shapeService">
    <property name="triangle" ref="triangle">
    <property name="circle" ref="circle">
    </property></property></bean>
    <bean class="com.dineshonjava.sdnext.aop.tutorial.aspectJ.Aspect.LoggingAspect" name="loggingAdvice">
</bean></aop:aspectj-autoproxy></beans>

 

 

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Dinesh Rajput

Dinesh Rajput is the chief editor of a website Dineshonjava, a technical blog dedicated to the Spring and Java technologies. It has a series of articles related to Java technologies. Dinesh has been a Spring enthusiast since 2008 and is a Pivotal Certified Spring Professional, an author of a book Spring 5 Design Pattern, and a blogger. He has more than 10 years of experience with different aspects of Spring and Java design and development. His core expertise lies in the latest version of Spring Framework, Spring Boot, Spring Security, creating REST APIs, Microservice Architecture, Reactive Pattern, Spring AOP, Design Patterns, Struts, Hibernate, Web Services, Spring Batch, Cassandra, MongoDB, and Web Application Design and Architecture. He is currently working as a technology manager at a leading product and web development company. He worked as a developer and tech lead at the Bennett, Coleman & Co. Ltd and was the first developer in his previous company, Paytm. Dinesh is passionate about the latest Java technologies and loves to write technical blogs related to it. He is a very active member of the Java and Spring community on different forums. When it comes to the Spring Framework and Java, Dinesh tops the list!

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