Project Structure and Main Class

Project Tree

src
├───main
    ├───java
        └───com
            └───ayah
                └───aop
                    ├───annotation
                    |       |
                    |       |─────────Test.java
                    |
                    ├───aspect
                    |      |
                    |      |──────────TestAcpect.java
                    |
                    ├───initializer
                    |       |
                    |       |──────────AspectInitializer.java
                    |
                    └───service
                            |
                            |
                            |──────AspectService.java
                            |
                            |──────AspectService1.java
                            |
                            |──────AspectService2.java
    

Coding

Test

package com.ayah.aop.annotation;

public @interface Test {

}

TestAspect

This class has different implementations in the next examples.

AspectInitializer

package com.ayah.aop.initializer;

import com.ayah.aop.service.AspectService1;
import com.ayah.aop.service.AspectService2;
import lombok.AllArgsConstructor;
import org.springframework.boot.CommandLineRunner;
import org.springframework.context.annotation.Configuration;

@AllArgsConstructor
@Configuration
public class AspectTestInitializer implements CommandLineRunner {

  private final AspectService1 aspectService1;
  private final AspectService2 aspectService2;

  @Override
  public void run(String... args) throws Exception {

      aspectService1.test1("Ayah","Al-Refai");
      aspectService1.test2(7,5);

      aspectService2.test1("Al-Refai","Ayah");
      aspectService2.test2(2,8);
  }
}

AspectService

package com.ayah.aop.service;

public interface AspectService {

  String test1(String firstName, String lastName);

  Integer test2(Integer num1, Integer num2);
}

AspectService1

package com.ayah.aop.service;

import com.ayah.aop.annotation.Test;
import org.springframework.stereotype.Service;

@Service
public class AspectService1 implements AspectService {

  @Test()
  public String test1(String firstName, String lastName) {
      System.out.println("AspectService1 -> test1 -> " + firstName + " " + lastName);
      return firstName + " " + lastName;
  }

  public Integer test2(Integer num1, Integer num2) {
      System.out.println("AspectService1 -> test2 -> " + (num1 + num2));
      return num1 + num2;
  }
}

AspectService2

package com.ayah.aop.service;

import com.ayah.aop.annotation.Test;
import org.springframework.stereotype.Service;

@Service
public class AspectService2 implements AspectService {
  
  public String test1(String firstName, String lastName) {
      System.out.println("AspectService2 -> test1 -> " + firstName + " " + lastName);
      return firstName + " " + lastName;
  }

  @Test()
  public Integer test2(Integer num1, Integer num2) {
      System.out.println("AspectService2 -> test2 -> " + (num1 + num2));
      return num1 + num2;
  }
}