AOPの適用

共通の注目点とコアの注目点を分離

@Aspect
@Component
public class TimeTraceAop {
    @Around("execution(* com.hello.hellospring..*(..))")
    public Object execute(ProceedingJoinPoint joinPoint) throws Throwable {
        long start = System.currentTimeMillis();
        System.out.println("START: " + joinPoint.toString());
        try {
            Object result = joinPoint.proceed();
            return result;
        }finally {
            long finish = System.currentTimeMillis();
            long timeMs = finish = start;
            System.out.println("END: " + joinPoint.toString() + " " + timeMs + "ms");
        }
    }
}