Spring中StopWatch的使用

古城微笑少年丶 2022-02-24 04:50 283阅读 0赞

StopWatch简单的秒表，允许多个任务的计时，暴露每个命名任务的总运行时间和运行时间。隐藏使用System.currentTimeMillis（），提高应用程序代码的可读性并减少计算错误的可能性。

以下演示使用StopWatch记录请求摘要日志信息：

@Slf4j
    public class PerformanceInteceptor implements HandlerInterceptor {
        private ThreadLocal<StopWatch> stopWatchThreadLocal = new ThreadLocal<>();
    
        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
            StopWatch sw = new StopWatch();
            stopWatchThreadLocal.set(sw);
            sw.start();
            return true;
        }
    
        @Override
        public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
            stopWatchThreadLocal.get().stop();
            stopWatchThreadLocal.get().start();
        }
    
        @Override
        public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
            StopWatch sw = stopWatchThreadLocal.get();
            sw.stop();
            String method = handler.getClass().getSimpleName();
            if (handler instanceof HandlerMethod) {
                String beanType = ((HandlerMethod) handler).getBeanType().getName();
                String methodName = ((HandlerMethod) handler).getMethod().getName();
                method = beanType + "." + methodName;
            }
            // sw.getTotalTimeMillis(), 总执行时间
            //sw.getTotalTimeMillis() - sw.getLastTaskTimeMillis(), 执行方法体所需要的时间
    
            log.info("{};{};{};{};{}ms;{}ms;{}ms", request.getRequestURI(), method,
                    response.getStatus(), ex == null ? "-" : ex.getClass().getSimpleName(),
                    sw.getTotalTimeMillis(), sw.getTotalTimeMillis() - sw.getLastTaskTimeMillis(),
                    sw.getLastTaskTimeMillis());
            stopWatchThreadLocal.remove();
        }
    }

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