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Explanation

Spring AOP (Aspect-Oriented Programming) separates cross-cutting concerns such as logging, auditing, security, and performance monitoring from business logic. This keeps the application modular, reusable, and easier to maintain.

Code:

@Aspect
@Component
public class LoggingAspect {

}

Explanation

The @Before advice executes before a target method is called. It is commonly used to log method names, input parameters, and request details before business logic begins execution.

Code:

@Before("execution(* com.example.service.*.*(..))")
public void logRequest(JoinPoint joinPoint) {
    System.out.println("Calling: " + joinPoint.getSignature().getName());
}

Explanation

The @AfterReturning advice executes after a method completes successfully. It is useful for auditing successful operations, tracking user activities, and recording changes made to business data.

Code:

@AfterReturning("execution(* com.example.service.*.*(..))")
public void auditSuccess() {
    System.out.println("Operation completed successfully");
}

Explanation

The @Around advice surrounds the execution of a method, allowing code to run before and after it. It is commonly used to measure execution time, monitor performance, and detect slow-running methods.

Code:

@Around("execution(* com.example.service.*.*(..))")
public Object monitor(ProceedingJoinPoint joinPoint) throws Throwable {
    long start = System.currentTimeMillis();
    Object result = joinPoint.proceed();
    System.out.println("Execution Time: " + (System.currentTimeMillis() - start) + " ms");
    return result;
}

Explanation

To use Aspect-Oriented Programming, enable AOP support in the Spring Boot application using @EnableAspectJAutoProxy. Spring automatically detects aspect classes and applies advice to matching methods during runtime.

Code:

@SpringBootApplication
@EnableAspectJAutoProxy
public class DemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}