content: /*
   * This library is part of OpenCms -
   * the Open Source Content Management System
   *
   * Copyright (c) Alkacon Software GmbH & Co. KG (https://www.alkacon.com)
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   * Lesser General Public License for more details.
   *
   * For further information about Alkacon Software, please see the
   * company website: https://www.alkacon.com
   *
   * For further information about OpenCms, please see the
   * project website: https://www.opencms.org
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  
  package org.opencms.ade.upload;
  
  import org.opencms.main.CmsLog;
  
  import java.io.Serializable;
  import java.util.Date;
  
  import org.apache.commons.logging.Log;
  
  /**
   * A class which is executed in a new thread, so its able to detect
   * when an upload process is frozen and sets an exception in order to
   * be canceled. This doesn't work in Google application engine.<p>
   */
  public class CmsUploadTimeoutWatcher extends Thread implements Serializable {
  
      /** The log object for this class. */
      private static final Log LOG = CmsLog.getLog(CmsUploadTimeoutWatcher.class);
  
      /** The serial version UID. */
      private static final long serialVersionUID = -649803529271569237L;
  
      /** The watchers interval. */
      private static final int WATCHER_INTERVAL = 5000;
  
      /** Last bytes read. */
      private long m_lastBytesRead;
  
      /** Timestamp for the last received data. */
      private long m_lastData = (new Date()).getTime();
  
      /** The listener to watch. */
      private CmsUploadListener m_listener;
  
      /**
       * A public constructor.<p>
       *
       * @param listener the listener to watch
       */
      public CmsUploadTimeoutWatcher(CmsUploadListener listener) {
  
          m_listener = listener;
      }
  
      /**
       * Cancels the watch process.<p>
       */
      public void cancel() {
  
          m_listener = null;
      }
  
      /**
       * The watching process.<p>
       *
       * @see java.lang.Thread#run()
       */
      @Override
      public void run() {
  
          try {
              Thread.sleep(WATCHER_INTERVAL);
          } catch (InterruptedException e) {
              LOG.error(Messages.get().container(Messages.ERR_UPLOAD_INTERRUPT_WATCH_DOG_1, m_listener.toString()), e);
          }
          if (m_listener != null) {
              if (((m_listener.getBytesRead() > 0) && (m_listener.getPercent() >= 100)) || m_listener.isCanceled()) {
                  LOG.debug(Messages.get().container(Messages.LOG_UPLOAD_FINISHED_WATCHER_1, m_listener.toString()));
                  m_listener = null;
              } else {
                  if (isFrozen()) {
                      m_listener.cancelUpload(new CmsUploadException(
                          Messages.get().getBundle().key(
                              Messages.ERR_UPLOAD_FROZEN_1,
                              Integer.valueOf(CmsUploadBean.DEFAULT_UPLOAD_TIMEOUT / 1000))));
                  } else {
                      run();
                  }
              }
          }
      }
  
      /**
       * Returns <code>true</code> if the upload process is frozen.<p>
       *
       * @return <code>true</code> if the upload process is frozen
       */
      private boolean isFrozen() {
  
          long now = (new Date()).getTime();
  
          if (m_listener.getBytesRead() > m_lastBytesRead) {
              m_lastData = now;
              m_lastBytesRead = m_listener.getBytesRead();
          } else if ((now - m_lastData) > CmsUploadBean.DEFAULT_UPLOAD_TIMEOUT) {
              return true;
          }
          return false;
      }
  }
  