de.uni_koeln.spinfo.maalr.webapp.util.DebugInterceptor.java Source code

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/*******************************************************************************
 * Copyright 2013 Sprachliche Informationsverarbeitung, University of Cologne
 * 
 * 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 de.uni_koeln.spinfo.maalr.webapp.util;

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

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

public class DebugInterceptor extends HandlerInterceptorAdapter {

    private static final Logger logger = LoggerFactory.getLogger(DebugInterceptor.class);
    private static final boolean enabled = logger.isDebugEnabled();

    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        if (enabled) {
            long startTime = System.currentTimeMillis();
            request.setAttribute("startTime", startTime);
        }
        return true;
    }

    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
            ModelAndView modelAndView) throws Exception {
        if (enabled) {
            long startTime = (Long) request.getAttribute("startTime");
            long endTime = System.currentTimeMillis();
            long executeTime = endTime - startTime;
            if (modelAndView != null) {
                logger.debug(
                        "Execution Time for view '" + modelAndView.getViewName() + "': " + executeTime + " ms.");
            } else {
                //logger.debug("Execution Time for request: " + executeTime + " ms.");
            }

        }
    }
}