package com.atlassian.johnson.filters;
   
   import com.atlassian.johnson.JohnsonEventContainer;
   import org.slf4j.Logger;
   import org.slf4j.LoggerFactory;
   
   import javax.servlet.http.HttpServletResponse;
   import javax.servlet.http.HttpServletRequest;
   import java.io.IOException;
  
  /**
   * A handler that returns a no-content temporarily unavailable response suitable for refusing responses when an
   * application is unable to handle normal requests. This is especially useful for cases where the normal response
   * is of an unknown, or dynamic content-type and sending actual content may confuse clients.
   * <p>
   * Example uses include AJAX requests, generated images, pdf, excel and word docs.
   */
  public class Johnson503Filter extends AbstractJohnsonFilter
  {
      private static final Logger log = LoggerFactory.getLogger(Johnson503Filter.class);
  
      protected void handleError(JohnsonEventContainer appEventContainer, HttpServletRequest servletRequest, HttpServletResponse servletResponse) throws IOException
      {
          log.info("The application is unavailable, or there are errors.  Returing a temporarily unavailable status.");
          servletResponse.setStatus(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
          // flushing the writer stops the app server from putting its html message into the otherwise empty response
          servletResponse.getWriter().flush();
      }
  
      protected void handleNotSetup(HttpServletRequest servletRequest, HttpServletResponse servletResponse) throws IOException
      {
          log.info("The application is not setup.  Returing a temporarily unavailable status.");
          servletResponse.setStatus(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
          // flushing the writer stops the app server from putting its html message into the otherwise empty response
          servletResponse.getWriter().flush();
      }
  }