org.ihtsdo.otf.refset.interceptor.RequestProcessingTimeInterceptor.java Source code

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Here is the source code for org.ihtsdo.otf.refset.interceptor.RequestProcessingTimeInterceptor.java

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/**
* Copyright 2014 IHTSDO
* 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 org.ihtsdo.otf.refset.interceptor;

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

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

/**
 *
 */
public class RequestProcessingTimeInterceptor implements HandlerInterceptor {

    private static final Logger LOGGER = LoggerFactory.getLogger(RequestProcessingTimeInterceptor.class);
    private static final String START_TIME = "sTime";
    private static final String TOTAL_TIME = "X-REQ-TIME";

    private boolean isEnabled = false;

    /* (non-Javadoc)
     * @see org.springframework.web.servlet.HandlerInterceptor#afterCompletion(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object, java.lang.Exception)
     */
    @Override
    public void afterCompletion(HttpServletRequest req, HttpServletResponse res, Object arg2, Exception e)
            throws Exception {

        if (isEnabled) {

            LOGGER.debug("afterCompletion");

            String tTime = Long.toString((System.currentTimeMillis() - (Long) req.getAttribute(START_TIME)) / 1000);
            LOGGER.debug("Total time taken in this request is {}", tTime);

        }
    }

    /* (non-Javadoc)
     * @see org.springframework.web.servlet.HandlerInterceptor#postHandle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object, org.springframework.web.servlet.ModelAndView)
     */
    @Override
    public void postHandle(HttpServletRequest req, HttpServletResponse res, Object arg2, ModelAndView model)
            throws Exception {

        if (isEnabled) {

            String tTime = Long.toString((System.currentTimeMillis() - (Long) req.getAttribute(START_TIME)) / 1000);
            LOGGER.debug("Total time taken in this request is {}", tTime);
            res.addHeader(TOTAL_TIME, tTime);
        }

    }

    /* (non-Javadoc)
     * @see org.springframework.web.servlet.HandlerInterceptor#preHandle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object)
     */
    @Override
    public boolean preHandle(HttpServletRequest req, HttpServletResponse res, Object arg2) throws Exception {

        if (isEnabled) {

            LOGGER.debug("preHandle");

            req.setAttribute(START_TIME, System.currentTimeMillis());

        }
        return true;
    }

    /**
     * @param isEnabled the isEnabled to set
     */
    public void setEnabled(boolean isEnabled) {
        this.isEnabled = isEnabled;
    }

}