Added the code example for Ordering advices using @order

https://jstobigdata.com/spring/advice-ordering-using-order-in-spring-aop/

Author: Bikraji

spring-aop-07-ordering-advice/src/main/java/com/jbd/saop/order/ApplicationConfig.java

@@ -1,4 +1,11 @@
 package com.jbd.saop.order;
 
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.EnableAspectJAutoProxy;
+
+@Configuration
+@EnableAspectJAutoProxy
+@ComponentScan("com.jbd.saop.order")
 public class ApplicationConfig {
 }

spring-aop-07-ordering-advice/src/main/java/com/jbd/saop/order/ExecutionTime.java

@@ -0,0 +1,11 @@
+package com.jbd.saop.order.advice;
+
+import org.aspectj.lang.annotation.Aspect;
+import org.aspectj.lang.annotation.Pointcut;
+
+@Aspect
+public class CommonPointcut {
+
+  @Pointcut("execution(* com.jbd.saop.order.dao.*.*(..))")
+  public void anyDaoMethod() {}
+}

spring-aop-07-ordering-advice/src/main/java/com/jbd/saop/order/advice/CommonPointcut.java

@@ -0,0 +1,26 @@
+package com.jbd.saop.order.advice;
+
+import org.aspectj.lang.JoinPoint;
+import org.aspectj.lang.annotation.After;
+import org.aspectj.lang.annotation.Aspect;
+import org.aspectj.lang.annotation.Before;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.annotation.Order;
+
+@Aspect
+@Configuration
+@Order(1)
+public class SecondAdvice {
+
+  @Before("CommonPointcut.anyDaoMethod()")
+  public void beforeAdvice(JoinPoint joinPoint) {
+    System.out.println("\n======= Inside @Before() - 1 =======");
+    System.out.println(joinPoint.getSignature().toShortString());
+  }
+
+  @After("CommonPointcut.anyDaoMethod()")
+  public void afterAdvice(JoinPoint joinPoint) {
+    System.out.println("\n======= Inside @After() - 1 =======");
+    System.out.println(joinPoint.getSignature().toShortString());
+  }
+}

spring-aop-07-ordering-advice/src/main/java/com/jbd/saop/order/advice/SecondAdvice.java

@@ -0,0 +1,22 @@
+package com.jbd.saop.order.advice;
+
+import org.aspectj.lang.ProceedingJoinPoint;
+import org.aspectj.lang.annotation.Around;
+import org.aspectj.lang.annotation.Aspect;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.annotation.Order;
+
+@Configuration
+@Aspect
+@Order(2)
+public class ThirdAdvice {
+
+  @Around("CommonPointcut.anyDaoMethod()")
+  public Object aroundAdvice(ProceedingJoinPoint pJoinPoint) throws Throwable {
+    System.out.println("\n======= Inside @Around() - 2 =======");
+    System.out.println(pJoinPoint.getSignature().toShortString());
+    Object result = pJoinPoint.proceed();
+    System.out.println("\n======= Inside @Around() - 2 =======");
+    return result;
+  }
+}

spring-aop-07-ordering-advice/src/main/java/com/jbd/saop/order/advice/ThirdAdvice.java

@@ -0,0 +1,33 @@
+package com.jbd.saop.order.advice;
+
+import org.aspectj.lang.JoinPoint;
+import org.aspectj.lang.annotation.*;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.annotation.Order;
+
+@Aspect
+@Configuration
+@Order(0)
+public class ZeroAdvice {
+
+  @Before("CommonPointcut.anyDaoMethod()")
+  public void beforeAdvice(JoinPoint joinPoint) {
+    System.out.println("\n======= Inside @Before() - 0 =======");
+    System.out.println(joinPoint.getSignature().toShortString());
+  }
+
+  @After("CommonPointcut.anyDaoMethod()")
+  public void afterAdvice(JoinPoint joinPoint) {
+    System.out.println("\n======= Inside @After() - 0 =======");
+    System.out.println(joinPoint.getSignature().toShortString());
+  }
+
+  @AfterReturning(
+    pointcut = "CommonPointcut.anyDaoMethod()",
+    returning = "result")
+  public void afterReturningAdvice(JoinPoint joinPoint, Object result) {
+    System.out.println("\n======= Inside @AfterReturning() - 0 =======");
+    System.out.println(joinPoint.getSignature().toShortString());
+    System.out.println("result: " + result);
+  }
+}

spring-aop-07-ordering-advice/src/main/java/com/jbd/saop/order/advice/ZeroAdvice.java

@@ -0,0 +1,13 @@
+package com.jbd.saop.order.dao;
+
+import org.springframework.scheduling.annotation.Async;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public class EmailRepository {
+
+  @Async
+  public void sendRegistrationEmail(String email){
+    System.out.println("Registration email will be sent to: " + email);
+  }
+}

spring-aop-07-ordering-advice/src/main/java/com/jbd/saop/order/dao/EmailRepository.java

@@ -1,18 +1,18 @@
 package com.jbd.saop.order.dao;
 
-import com.jbd.saop.order.ExecutionTime;
 import org.springframework.stereotype.Repository;
 
 //A very stupid demo repository
 @Repository
 public class UserRepository {
   //Add a user
-  @ExecutionTime
-  public UserRepository add(String username) throws InterruptedException {
-    Thread.sleep(100);
+  public UserRepository add(String username, String password) {
     if(username == null) {
       throw new RuntimeException("username is null", new NullPointerException());
     }
+    if (password == null) {
+      throw new RuntimeException("password is null", new NullPointerException());
+    }
     System.out.println("New user added: " + username);
     return this;
   }
@@ -24,7 +24,6 @@ public UserRepository update(String username, String email) {
   }
 
   //Delete an user
-  @ExecutionTime
   public boolean delete(String username){
     if (username == null) {
       throw new RuntimeException("username is null", new NullPointerException());

spring-aop-07-ordering-advice/src/main/java/com/jbd/saop/order/dao/UserRepository.java

@@ -0,0 +1,21 @@
+package com.jbd.saop.order.service;
+
+import com.jbd.saop.order.dao.EmailRepository;
+import com.jbd.saop.order.dao.UserRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class UserService {
+  @Autowired
+  private UserRepository userRepository;
+
+  @Autowired
+  private EmailRepository emailRepository;
+
+  public void registerUser(String username, String email, String password) {
+    userRepository.add(username, password);
+    userRepository.update(username, email);
+    emailRepository.sendRegistrationEmail(email);
+  }
+}

spring-aop-07-ordering-advice/src/main/java/com/jbd/saop/order/service/UserService.java

@@ -0,0 +1,27 @@
+package com.jbd.saop.order;
+
+import com.jbd.saop.order.dao.UserRepository;
+import com.jbd.saop.order.service.UserService;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
+
+@SpringJUnitConfig(ApplicationConfig.class)
+public class TestAdviceOrdering {
+
+  @Autowired
+  private UserService userService;
+
+  @Autowired
+  private UserRepository userRepository;
+
+  @Test
+  public void testAddUser() {
+    userRepository.add("abc", "abc@123");
+  }
+
+  @Test
+  public void testRegUser() {
+    userService.registerUser("abc", "abc@jbd.com", "abc@123");
+  }
+}