ru.org.linux.spring.Perf4jHandlerInterceptor.java Source code

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Here is the source code for ru.org.linux.spring.Perf4jHandlerInterceptor.java

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/*
 * Copyright 1998-2012 Linux.org.ru
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

package ru.org.linux.spring;

import org.perf4j.StopWatch;
import org.perf4j.commonslog.CommonsLogStopWatch;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
import org.springframework.web.servlet.resource.DefaultServletHttpRequestHandler;
import org.springframework.web.servlet.resource.ResourceHttpRequestHandler;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class Perf4jHandlerInterceptor extends HandlerInterceptorAdapter {
    private static final String ATTRIBUTE = "perf4jStopWatch";
    private static final int TIME_THRESHOLD = 500;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        if (handler instanceof ResourceHttpRequestHandler || handler instanceof DefaultServletHttpRequestHandler) {
            return true;
        }

        String name;

        if (handler instanceof HandlerMethod) {
            name = ((HandlerMethod) handler).getBeanType().getSimpleName();
        } else {
            name = handler.getClass().getSimpleName();
        }

        CommonsLogStopWatch watch = new CommonsLogStopWatch(name);

        watch.setTimeThreshold(TIME_THRESHOLD);

        request.setAttribute(ATTRIBUTE, watch);

        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
            ModelAndView modelAndView) throws Exception {
        StopWatch stopWatch = (StopWatch) request.getAttribute(ATTRIBUTE);

        if (stopWatch != null) {
            stopWatch.stop();
        }
    }
}