/*
    * Licensed under the GPL License. You may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *   https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
    *
    * THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
    * WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
    * PURPOSE.
   */
  package psiprobe.controllers.system;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.beans.factory.annotation.Value;
  import org.springframework.stereotype.Controller;
  import org.springframework.web.bind.ServletRequestUtils;
  import org.springframework.web.bind.annotation.RequestMapping;
  import org.springframework.web.servlet.ModelAndView;
  import org.springframework.web.servlet.mvc.ParameterizableViewController;
  import org.springframework.web.servlet.view.RedirectView;
  
  /**
   * Advises Java to run GC asap.
   */
  @Controller
  public class AdviseGarbageCollectionController extends ParameterizableViewController {
  
    /** The Constant logger. */
    private static final Logger logger =
        LoggerFactory.getLogger(AdviseGarbageCollectionController.class);
  
    /** The replace pattern. */
    private String replacePattern;
  
    /**
     * Gets the replace pattern.
     *
     * @return the replace pattern
     */
    public String getReplacePattern() {
      return replacePattern;
    }
  
    /**
     * Sets the replace pattern.
     *
     * @param replacePattern the new replace pattern
     */
    @Value("^http(s)?://[a-zA-Z\\-\\.0-9]+(:[0-9]+)?")
    public void setReplacePattern(String replacePattern) {
      this.replacePattern = replacePattern;
    }
  
    @RequestMapping(path = "/adm/advisegc.htm")
    @Override
    public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response)
        throws Exception {
      return super.handleRequest(request, response);
    }
  
    @Override
    protected ModelAndView handleRequestInternal(HttpServletRequest request,
        HttpServletResponse response) throws Exception {
  
      boolean finalization = ServletRequestUtils.getBooleanParameter(request, "fin", false);
  
      String referer = request.getHeader("Referer");
      String redirectUrl;
      if (referer != null) {
        redirectUrl = referer.replaceAll(replacePattern, "");
      } else {
        redirectUrl = request.getContextPath() + getViewName();
      }
      if (finalization) {
        Runtime.getRuntime().runFinalization();
        logger.debug("Advised finalization");
      } else {
        Runtime.getRuntime().gc();
        logger.debug("Advised Garbage Collection");
      }
      logger.debug("Redirected to {}", redirectUrl);
      return new ModelAndView(new RedirectView(redirectUrl));
    }
  
    @Value("/sysinfo.htm")
    @Override
    public void setViewName(String viewName) {
      super.setViewName(viewName);
    }
  
  }