/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH (http://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: http://www.alkacon.com
*
* For further information about OpenCms, please see the
* project website: http://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,
new Integer(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;
}
}