Java: What is Spring AOP?

1@Aspect
2@Component
3public class LoggingAspect {
4    @Before("execution(* com.example.service.*.*(..))")
5    public void logBefore(JoinPoint joinPoint) {
6        System.out.println("Calling: " + joinPoint.getSignature().getName());
7    }
8    @AfterReturning(pointcut = "execution(* com.example.service.*.*(..))", returning = "result")
9    public void logAfter(JoinPoint jp, Object result) {
10        System.out.println("Returned: " + result);
11    }
12    @Around("execution(* com.example.service.*.*(..))")
13    public Object measureTime(ProceedingJoinPoint pjp) throws Throwable {
14        long start = System.currentTimeMillis();
15        Object result = pjp.proceed();
16        System.out.println("Time: " + (System.currentTimeMillis() - start) + "ms");
17        return result;
18    }
19}