/**
  * Clear the entire contents of the cache and delete the backing files. This should only be used
  * when the server is reinitializing, because the users are going to lose their files.
  */
 public static void purgeCache(Configuration conf, MRAsyncDiskService service) throws IOException {
   synchronized (cachedArchives) {
     LocalFileSystem localFs = FileSystem.getLocal(conf);
     for (Map.Entry<String, CacheStatus> f : cachedArchives.entrySet()) {
       try {
         deleteLocalPath(service, localFs, f.getValue().localizedLoadPath);
       } catch (IOException ie) {
         LOG.debug("Error cleaning up cache", ie);
       }
     }
     cachedArchives.clear();
   }
 }
  public ReaderHandler(LowLevelDbAccess lowLevelDbAccess, String webDir) {

    loginInfoDb = new LoginInfo.DB(lowLevelDbAccess);
    userDb = new User.DB(lowLevelDbAccess);
    feedDb = new Feed.DB(lowLevelDbAccess);
    articleDb = new Article.DB(lowLevelDbAccess);
    readArticlesCollDb = new ReadArticlesColl.DB(lowLevelDbAccess);
    userHelpers = new UserHelpers(loginInfoDb, userDb);

    setContextPath("/");

    File warPath = new File(webDir);
    setWar(warPath.getAbsolutePath());

    if (isInJar) {
      for (Map.Entry<String, String> entry : PATH_MAPPING.entrySet()) {
        addPrebuiltJsp(entry.getKey(), "jsp." + entry.getValue().replaceAll("_", "_005f") + "_jsp");
      }
    } else {
      for (Map.Entry<String, String> entry : PATH_MAPPING.entrySet()) {
        addServlet(
            new ServletHolder(new RedirectServlet("/" + entry.getValue() + ".jsp")),
            entry.getKey());
      }
    }

    setErrorHandler(new ReaderErrorHandler());
  }