aop计算方法耗时

package necs.omms.common.aop;

import lombok.extern.apachecommons.CommonsLog;
import org.apache.commons.lang.time.StopWatch;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

@Component
@Aspect
@CommonsLog
public class PerformanceMonitor {
    private static Log log = LogFactory.getLog(PerformanceMonitor.class);


    /**
     * A join point is in the controller layer if the method is
     * modified by public and defined in a type in the
     * com.shawn.service package or any sub-package under that
     * and modified by public.execution(* com.baobaotao..*(..))l
     */
    @Pointcut("execution( * necs.omms.controller..*(..))")
    private void controllerLayer() {
    }

    /**
     * Monitor the elapsed time of method on controller layer, in
     * order to detect performance problems as soon as possible.
     * If elapsed time > 1 s, log it as an error. Otherwise, log it
     * as an info.
     */
    @Around("controllerLayer()")
    public Object monitorElapsedTime(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
        // Timing the method in controller layer
        StopWatch stopWatch = new StopWatch();
        stopWatch.start();
        Object result = proceedingJoinPoint.proceed();
        stopWatch.stop();

        // Log the elapsed time
        double elapsedTime = stopWatch.getTime() / 1000;
        Signature signature = proceedingJoinPoint.getSignature();
        String infoString = "[" + signature.toShortString() + "][Elapsed time: " + elapsedTime + " s]";
        if (elapsedTime > 1) {
            log.error(infoString + "[Note that it's time consuming!]");
        } else {
            log.info(infoString);
        }

        // Return the result
        return result;
    }

    @Before(value = "controllerLayer()")
    public void doBefore(){
        System.out.println("-------------@BEFORE------------");
    }

}