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Spring AOP Advices - Before advice example - xml based configuration


In Spring, aspect-oriented programming (AOP) is a programming paradigm that aims to increase modularity by allowing the separation of cross-cutting concerns. AOP forms a basis for aspect-oriented software development.

In this page you will see an example for Spring AOP - before advice. Spring Before Advice will be executed before the method execution.

pom.xml file gives all required dependencies:

<project xmlns="http://maven.apache.org/POM/4.0.0" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
	http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>SpringJavaBasedConfig</groupId>
	<artifactId>SpringJavaBasedConfig</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<properties>
		<spring.version>3.2.0.RELEASE</spring.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-core</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>cglib</groupId>
			<artifactId>cglib</artifactId>
			<version>3.1</version>
		</dependency>
	</dependencies>
</project>

My business logic service class: It has only one method runMyBusinessLogic() contains the business logic, we want to run advice method before every execution of this method.

package com.java2novice.bean;

public class MyBusinessService {

	public void runMyBusinessLogic(){
		System.out.println("**************************");
		System.out.println("Running business logic...");
		System.out.println("**************************");
	}
}

Now create "Before Advice". Create a class which implements MethodBeforeAdvice interface. It will execute before the method every execution.

package com.java2novice.aop;

import java.lang.reflect.Method;

import org.springframework.aop.MethodBeforeAdvice;

public class RunBeforeExecution implements MethodBeforeAdvice{

	@Override
	public void before(Method methodOrg, Object[] args, Object target) throws Throwable {
		System.out.println("Inside RunBeforeExecution.before() method...");
		System.out.println("Running before advice...");
	}
}

Here is the xml based configuration file. Add bean entry for RunBeforeExecution class (before advice class). Also create a proxy for MyBusinessService class. In this proxy configuration, you should add two properties called 'target' and 'interceptorNames'. 'target' defines in which bean you want to introduce advice. 'interceptorNames' defines that which advice class you want to introduce to the said target.

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
	http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
	http://www.springframework.org/schema/context 
	http://www.springframework.org/schema/context/spring-context-3.0.xsd">
	
    <bean id="busService" class="com.java2novice.bean.MyBusinessService" />
	<bean id="beforeAdv" class="com.java2novice.aop.RunBeforeExecution" />
    <bean id="busServiceProxy" class="org.springframework.aop.framework.ProxyFactoryBean" >
        <property name="target" ref="busService" />
        <property name="interceptorNames">
			<list>
				<value>beforeAdv</value>
			</list>
		</property>
    </bean>
</beans>

Here is the final demo class: Note that we are calling proxy bean object, not the business service bean directly.

package com.java2novice.test;

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

import com.java2novice.bean.MyBusinessService;

public class SpringDemo {

	public static void main(String a[]){

		String confFile = "applicationContext.xml";
		ConfigurableApplicationContext context 
								= new ClassPathXmlApplicationContext(confFile);
		MyBusinessService busServ = (MyBusinessService) context.getBean("busServiceProxy");
		busServ.runMyBusinessLogic();
	}
}

In the next page you will see an example for Spring AOP - after returning advice. Spring After returning advice will be executed after the method execution.


Output:
Inside RunBeforeExecution.before() method...
Running before advice...
************************************
Running business logic...
************************************
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Knowledge Centre
Interface and its usage
Interface is similar to a class which may contain method's signature only but not bodies and it is a formal set of method and constant declarations that must be defined by the class that implements it. Interfaces are useful for declaring methods that one or more classes are expected to implement, capturing similarities between unrelated classes without forcing a class relationship and determining an object's programming interface without revealing the actual body of the class.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected] or you can comment on the page.

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