Showing posts with label Around Advice. Show all posts
Showing posts with label Around Advice. Show all posts

Saturday, 8 December 2018

Spring AOP AspectJ Around Advice example using XML configuration | Spring Tutorial

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Mastering Spring AOP: Around Advice with XML

Aspect-Oriented Programming (AOP) allows developers to handle "cross-cutting concerns" like logging and security separately from main business logic. Among all advice types, Around Advice is the most powerful and flexible.

What is Around Advice?

Around Advice surrounds a method execution. It gives you full control, allowing you to perform actions both before and after the method runs. You can even decide whether the method should execute at all or provide your own custom return value.

Why Use XML Configuration?

While annotations are popular, XML configuration keeps your Java classes clean and completely decoupled from AOP logic. This is especially useful in legacy systems or when you want a centralized place to manage all your application's aspects without touching the source code.

Practical Use Cases

Around Advice is perfect for performance monitoring. You can start a timer, let the method run, stop the timer, and log the total execution time—all in one place! It’s also ideal for caching and complex security checks.

Key Takeaway: Around Advice provides the ultimate level of control over method execution, making your Spring applications more modular and powerful.


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Spring AOP AspectJ Around Advice example using XML configuration | Spring Tutorial

Spring AOP AspectJ Around Advice example using XML configuration | Spring Tutorial

Spring AOP AspectJ Around Advice example using XML configuration | Spring Tutorial


pom.xml

<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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.ram.core</groupId>
    <artifactId>SpringDemo</artifactId>
    <packaging>jar</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>SpringDemo</name>
    <url>http://maven.apache.org</url>

    <properties>
        <spring.version>5.0.5.RELEASE</spring.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>

        <!-- Spring 5 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>

        <!-- Spring AOP + AspectJ -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring.version}</version>
        </dependency>
       
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
            <version>1.9.1</version>
        </dependency>
       
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.1</version>
        </dependency>

    </dependencies>

</project>

EmployeeService.java

package com.ram.service;

public class EmployeeService
{
    public String addEmployee(String name)
    {
        System.out
                .println("addEmployee(String name) method is called");
        return "Employee Peter information is added successfully";
    }

    public void modifyEmployee()
    {
        System.out.println("modifyEmployee() is called");
    }

    public void deleteEmployee()
    {
        System.out.println("deleteEmployee() is called");
    }

}

LoggingAspect.java

package com.ram.Aspect;

import java.util.Arrays;

import org.aspectj.lang.ProceedingJoinPoint;

public class LoggingAspect
{
    public void logAround(ProceedingJoinPoint proceedingJoinPoint)
            throws Throwable
    {

        System.out.println("logAround() is running!");
        System.out.println("hijacked method = "
                + proceedingJoinPoint.getSignature().getName());
        System.out.println("hijacked arguments = "
                + Arrays.toString(proceedingJoinPoint.getArgs()));

        System.out.println("Around before is running!");
        proceedingJoinPoint.proceed(); // continue on the intercepted
                                        // method
        System.out.println("Around after is running!");

        System.out.println("******");
    }

}

applicationContext.xml

<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"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-4.3.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop-4.3.xsd">


    <bean id="employeeService" class="com.ram.service.EmployeeService"></bean>

    <!-- Aspect -->
    <bean id="logAspect" class="com.ram.Aspect.LoggingAspect" />

    <aop:config>
        <aop:aspect id="aspectLoggging" ref="logAspect">
            <!-- @Around -->
            <aop:pointcut id="pointCutAround"
                expression="execution(* com.ram.service.EmployeeService.addEmployee(..)))" />

            <aop:around method="logAround" pointcut-ref="pointCutAround" />
        </aop:aspect>

    </aop:config>

</beans>

App.java

package com.ram.core;

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

import com.ram.service.EmployeeService;

public class App
{
    public static void main(String[] args)
    {
        ApplicationContext context = new ClassPathXmlApplicationContext(
                "applicationContext.xml");

        System.out.println("---------------------------------------");

        EmployeeService employeeService = context
                .getBean("employeeService", EmployeeService.class);

        employeeService.addEmployee("Peter");

        employeeService.modifyEmployee();

        employeeService.deleteEmployee();

    }

}

Output

Nov 15, 2018 10:41:50 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@32709393: startup date [Thu Nov 15 10:41:50 IST 2018]; root of context hierarchy
Nov 15, 2018 10:41:50 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [applicationContext.xml]
---------------------------------------
logAround() is running!
hijacked method = addEmployee
hijacked arguments = [Peter]
Around before is running!
addEmployee(String name) method is called
Around after is running!
******
modifyEmployee() is called
deleteEmployee() is called

Click the below link to download the code:
https://sites.google.com/site/ramj2eev2/java_basics/SpringDemo_aspectj_around_advise_XML_Config.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/javaee/tree/master/Spring_2018/SpringDemo_aspectj_around_advise_XML_Config

Bitbucket Link:
https://bitbucket.org/ramram43210/spring/src/0989e369f77ed192b0b224588ebfcdeb2019a6a2/Spring_2018/SpringDemo_aspectj_around_advise_XML_Config/?at=master

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  • Thursday, 15 November 2018

    How to apply AroundAdvice using RegexpMethodPointcutAdvisor and BeanNameAutoProxyCreator

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    Advanced Spring AOP: Around Advice with Regex

    Welcome to this beginner-friendly guide! Today, we are exploring how to use Spring AOP to target specific methods across multiple classes using regular expressions. This is a powerful way to keep your code clean and organized.

    What is BeanNameAutoProxyCreator?

    In many Spring applications, you want to apply logic (advice) to many beans at once. Instead of creating a proxy for each bean manually, the BeanNameAutoProxyCreator does the work for you. You just tell it which bean names to look for!

    Setting Up the Project

    In this example, we have two main services:

    • EmployeeService: Manages employee data like name, age, and address.
    • CustomerService: Manages customer data like name, age, and address.

    We also have our AroundAdvice class, which implements the MethodInterceptor interface. This class contains the logic that will run before and after our methods.

    Configuring the Advisor with Regex

    We use the RegexpMethodPointcutAdvisor to define exactly which methods should be intercepted. By using a pattern like .*age.*, we can tell Spring to only apply our advice to methods that have the word "age" in them, such as getEmployeeAge and getCustomerAge.

    How the Magic Happens

    In the XML configuration, we link everything together. The BeanNameAutoProxyCreator identifies classes ending in "Service", and the RegexpMethodPointcutAdvisor filters those classes for specific method names. When you run the app, you'll see the advice executing only for the age-related methods!

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    Check out these other videos to continue your learning journey:


    Click here to watch on Youtube:
    https://www.youtube.com/watch?v=MEORCeIwrNY&list=UUhwKlOVR041tngjerWxVccw

    Click the below Image to Enlarge:
    How to apply AroundAdvice using RegexpMethodPointcutAdvisor and BeanNameAutoProxyCreator

    How to apply AroundAdvice using RegexpMethodPointcutAdvisor and BeanNameAutoProxyCreator

    How to apply AroundAdvice using RegexpMethodPointcutAdvisor and BeanNameAutoProxyCreator

    How to apply AroundAdvice using RegexpMethodPointcutAdvisor and BeanNameAutoProxyCreator

    pom.xml

    <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/maven-v4_0_0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <groupId>com.ram.core</groupId>
        <artifactId>SpringDemo</artifactId>
        <packaging>jar</packaging>
        <version>1.0-SNAPSHOT</version>
        <name>SpringDemo</name>
        <url>http://maven.apache.org</url>

        <properties>
            <spring.version>5.0.5.RELEASE</spring.version>
        </properties>

        <dependencies>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>3.8.1</version>
                <scope>test</scope>
            </dependency>

            <!-- Spring 5 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>
        </dependencies>
    </project>

    EmployeeService.java

    package com.ram.service;

    public class EmployeeService
    {
        public String getEmployeeName()
        {
            System.out.println("Get Employee Name");
            return "Dave";
        }
       
        public int getEmployeeAge()
        {
            System.out.println("Get Employee Age");
            return 28;
        }
       
        public String getEmployeeAddress()
        {
            System.out.println("Get Employee Address");
            return "A111, East Street";
        }
    }

    CustomerService.java

    package com.ram.service;

    public class CustomerService
    {
        public String getCustomerName()
        {
            System.out.println("Get Customer Name");
            return "Peter";
        }
       
        public int getCustomerAge()
        {
            System.out.println("Get Customer Age");
            return 38;
        }
       
        public String getCustomerAddress()
        {
            System.out.println("Get Customer Address");
            return "B111, North Street";
        }
    }

    AroundAdvice.java

    package com.ram.Advice;

    import org.aopalliance.intercept.MethodInterceptor;
    import org.aopalliance.intercept.MethodInvocation;

    public class AroundAdvice implements MethodInterceptor
    {

        public Object invoke(MethodInvocation mi) throws Throwable
        {
            Object obj;
            System.out.println("AroundAdvice applied before actual method = "
                    + mi.getMethod().getName());
            obj = mi.proceed();
            System.out.println("obj = " + obj);
            System.out.println("AroundAdvice applied after actual method =  "
                    + mi.getMethod().getName());
            return obj;
        }

    }

    applicationContext.xml

    <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-4.3.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.3.xsd">


        <bean id="employeeService" class="com.ram.service.EmployeeService"></bean>
        <bean id="customerService" class="com.ram.service.CustomerService"></bean>
        <bean id="aroundAdvice" class="com.ram.Advice.AroundAdvice"></bean>

        <bean id="employeeAdvisor"
            class="org.springframework.aop.support.RegexpMethodPointcutAdvisor">
            <property name="patterns">
                <list>
                    <value>.*Age.*</value>
                </list>
            </property>
            <property name="advice" ref="aroundAdvice" />
        </bean>
       
        <bean
            class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
            <property name="beanNames">
                <list>
                    <value>*Service</value>
                </list>
            </property>
            <property name="interceptorNames">
                <list>
                    <value>employeeAdvisor</value>
                </list>
            </property>
        </bean>


    </beans>

    App.java

    package com.ram.core;

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

    import com.ram.service.CustomerService;
    import com.ram.service.EmployeeService;

    public class App
    {
        public static void main(String[] args)
        {
            ApplicationContext context = new ClassPathXmlApplicationContext(
                    "applicationContext.xml");

            System.out.println("---------------------------------------");

            EmployeeService employeeService = context
                    .getBean("employeeService", EmployeeService.class);

            employeeService.getEmployeeName();

            System.out.println("----------------------------------------");

            employeeService.getEmployeeAge();

            System.out.println("----------------------------------------");

            employeeService.getEmployeeAddress();
           
           
            CustomerService customerService = context
                    .getBean("customerService", CustomerService.class);
           
            System.out.println("----------------------------------------");
           
            customerService.getCustomerName();

            System.out.println("----------------------------------------");

            customerService.getCustomerAge();

            System.out.println("----------------------------------------");

            customerService.getCustomerAddress();
        }

    }

    Output

    Oct 29, 2018 9:00:07 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh
    INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@736e9adb: startup date [Mon Oct 29 09:00:07 IST 2018]; root of context hierarchy
    Oct 29, 2018 9:00:08 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
    INFO: Loading XML bean definitions from class path resource [applicationContext.xml]
    ---------------------------------------
    Get Employee Name
    ----------------------------------------
    AroundAdvice applied before actual method = getEmployeeAge
    Get Employee Age
    obj = 28
    AroundAdvice applied after actual method =  getEmployeeAge
    ----------------------------------------
    Get Employee Address
    ----------------------------------------
    Get Customer Name
    ----------------------------------------
    AroundAdvice applied before actual method = getCustomerAge
    Get Customer Age
    obj = 38
    AroundAdvice applied after actual method =  getCustomerAge
    ----------------------------------------
    Get Customer Address

    Click the below link to download the code:
    https://sites.google.com/site/ramj2eev2/java_basics/SpringDemo_BeanNameAutoProxyCreator.zip?attredirects=0&d=1

    Github Link:
    https://github.com/ramram43210/javaee/tree/master/Spring_2018/SpringDemo_BeanNameAutoProxyCreator

    Bitbucket Link:
    https://bitbucket.org/ramram43210/spring/src/7d2a171064f15a9cee482e820ec0271fa30b23b8/Spring_2018/SpringDemo_BeanNameAutoProxyCreator/?at=master

    See also:

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  • Java Collection Framework Tutorial
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  • Cooking Tutorial
  • Spring AOP Example – How to apply AroundAdvice using RegexpMethodPointcutAdvisor | Spring Tutorial

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    Mastering Spring AOP with Regex

    Welcome back! In this tutorial, we are exploring one of the most flexible ways to apply Around Advice in Spring: using the RegexpMethodPointcutAdvisor. This allows you to target specific methods based on name patterns rather than just applying it to every method in a class.

    What is a RegexpMethodPointcutAdvisor?

    Normally, when we use Spring AOP, we might want to intercept methods like getEmployeeName or saveCustomerData. Instead of writing complex logic, we can use Regular Expressions (Regex) to tell Spring exactly which method names to look for.

    How it Works in This Example

    In this video, we have an EmployeeService class with several methods. We want to apply our Around Advice logic only to methods that match a specific pattern. By using the advisor, we can easily filter out the methods we don't want to affect.

    • The Benefit: You don't have to change your Java code.
    • The Logic: You simply define the pattern in your XML configuration.
    • The Result: Your advice runs exactly where it's needed!

    Step-by-Step Implementation

    1. We define our Around Advice class which handles the logic before and after method execution.
    2. We set up the RegexpMethodPointcutAdvisor bean in our configuration.
    3. We provide a "pattern" (like .*getName.*) to match specific method names.
    4. We use a ProxyFactoryBean to bring everything together.


    Click here to watch on Youtube:
    https://www.youtube.com/watch?v=SVPGu2A5--Q&list=UUhwKlOVR041tngjerWxVccw

    Click the below Image to Enlarge:
    Spring AOP Example – How to apply AroundAdvice using RegexpMethodPointcutAdvisor | Spring Tutorial

    Spring AOP Example – How to apply AroundAdvice using RegexpMethodPointcutAdvisor | Spring Tutorial

    Spring AOP Example – How to apply AroundAdvice using RegexpMethodPointcutAdvisor | Spring Tutorial

    Spring AOP Example – How to apply AroundAdvice using RegexpMethodPointcutAdvisor | Spring Tutorial
    pom.xml

    <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/maven-v4_0_0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <groupId>com.ram.core</groupId>
        <artifactId>SpringDemo</artifactId>
        <packaging>jar</packaging>
        <version>1.0-SNAPSHOT</version>
        <name>SpringDemo</name>
        <url>http://maven.apache.org</url>

        <properties>
            <spring.version>5.0.5.RELEASE</spring.version>
        </properties>

        <dependencies>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>3.8.1</version>
                <scope>test</scope>
            </dependency>

            <!-- Spring 5 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>
        </dependencies>
    </project>

    EmployeeService.java

    package com.ram.service;

    public class EmployeeService
    {
        public String getEmployeeName()
        {
            System.out.println("Get Employee Name");
            return "Dave";
        }
       
        public int getEmployeeAge()
        {
            System.out.println("Get Employee Age");
            return 28;
        }
       
        public String getEmployeeAddress()
        {
            System.out.println("Get Employee Address");
            return "A111, East Street";
        }
    }

    AroundAdvice.java

    package com.ram.Advice;

    import org.aopalliance.intercept.MethodInterceptor;
    import org.aopalliance.intercept.MethodInvocation;

    public class AroundAdvice implements MethodInterceptor
    {

        public Object invoke(MethodInvocation mi) throws Throwable
        {
            Object obj;
            System.out.println("AroundAdvice applied before actual method = "
                    + mi.getMethod().getName());
            obj = mi.proceed();
            System.out.println("obj = " + obj);
            System.out.println("AroundAdvice applied after actual method =  "
                    + mi.getMethod().getName());
            return obj;
        }

    }

    applicationContext.xml

    <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-4.3.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.3.xsd">


        <bean id="employeeService" class="com.ram.service.EmployeeService"></bean>
        <bean id="aroundAdvice" class="com.ram.Advice.AroundAdvice"></bean>

        <bean id="employeeServiceProxy" class="org.springframework.aop.framework.ProxyFactoryBean">

            <property name="target" ref="employeeService"></property>
            <property name="interceptorNames">
                <list>
                    <value>employeeAdvisor</value>
                </list>
            </property>
        </bean>

        <bean id="employeeAdvisor"
            class="org.springframework.aop.support.RegexpMethodPointcutAdvisor">
            <property name="patterns">
                <list>
                    <value>.*getEmployeeA.*</value>
                </list>
            </property>
            <property name="advice" ref="aroundAdvice" />
        </bean>

    </beans>

    App.java

    package com.ram.core;

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

    import com.ram.service.EmployeeService;

    public class App
    {
        public static void main(String[] args)
        {
            ApplicationContext context = new ClassPathXmlApplicationContext(
                    "applicationContext.xml");

            System.out.println("---------------------------------------");

            EmployeeService employeeService = context
                    .getBean("employeeServiceProxy", EmployeeService.class);

            employeeService.getEmployeeName();

            System.out.println("----------------------------------------");

            employeeService.getEmployeeAge();

            System.out.println("----------------------------------------");

            employeeService.getEmployeeAddress();
        }

    }

    Output

    Oct 24, 2018 10:21:08 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh
    INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@6ebc05a6: startup date [Wed Oct 24 10:21:08 IST 2018]; root of context hierarchy
    Oct 24, 2018 10:21:09 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
    INFO: Loading XML bean definitions from class path resource [applicationContext.xml]
    ---------------------------------------
    Get Employee Name
    ----------------------------------------
    AroundAdvice applied before actual method = getEmployeeAge
    Get Employee Age
    obj = 28
    AroundAdvice applied after actual method =  getEmployeeAge
    ----------------------------------------
    AroundAdvice applied before actual method = getEmployeeAddress
    Get Employee Address
    obj = A111, East Street
    AroundAdvice applied after actual method =  getEmployeeAddress

    Click the below link to download the code:
    https://sites.google.com/site/ramj2eev2/java_basics/SpringDemo_RegexpMethodPointcutAdvisor.zip?attredirects=0&d=1

    Github Link:
    https://github.com/ramram43210/javaee/tree/master/Spring_2018/SpringDemo_RegexpMethodPointcutAdvisor

    Bitbucket Link:
    https://bitbucket.org/ramram43210/spring/src/7d2a171064f15a9cee482e820ec0271fa30b23b8/Spring_2018/SpringDemo_RegexpMethodPointcutAdvisor/?at=master

    See also:

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