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OpenCms is an enterprise-ready, easy to use website content management system based on Java and XML technology. Offering a complete set of features, OpenCms helps content managers worldwide to create and maintain beautiful websites fast and efficiently.

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/*
 * This library is part of OpenCms -
 * the Open Source Content Management System
 *
 * Copyright (c) Alkacon Software GmbH & Co. KG (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 GmbH & Co. KG, 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.scheduler;

import org.opencms.main.CmsLog;

import org.apache.commons.logging.Log;

/**
 * A worker thread for the OpenCms scheduler.

* * @since 6.0.0 */ public class CmsSchedulerThread extends Thread { /** The log object for this class. */ private static final Log LOG = CmsLog.getLog(CmsSchedulerThread.class); /** The scheduler thread pool this thread belongs to. */ private CmsSchedulerThreadPool m_pool; /** A flag that signals the thread to terminate. */ private boolean m_run; /** A runnable class. */ private Runnable m_runnable; /** * Create a scheduler thread that runs continuosly, * waiting for new runnables to be provided by the scheduler thread pool.

* * @param pool the pool to use * @param threadGroup the thread group to use * @param threadName the name for the thread * @param prio the priority of the thread * @param isDaemon controls if this should be a deamon thread or not */ CmsSchedulerThread( CmsSchedulerThreadPool pool, ThreadGroup threadGroup, String threadName, int prio, boolean isDaemon) { this(pool, threadGroup, threadName, prio, isDaemon, null); } /** * Create a scheduler thread that runs the specified runnable exactly once.

* * @param pool the pool to use * @param threadGroup the thread group to use * @param threadName the name for the thread * @param prio the priority of the thread * @param isDaemon controls if this should be a deamon thread or not * @param runnable the runnable to run */ CmsSchedulerThread( CmsSchedulerThreadPool pool, ThreadGroup threadGroup, String threadName, int prio, boolean isDaemon, Runnable runnable) { super(threadGroup, threadName); m_run = true; m_pool = pool; m_runnable = runnable; setPriority(prio); setDaemon(isDaemon); } /** * Loop, executing targets as they are received.

*/ @Override public void run() { boolean runOnce = (m_runnable != null); while (m_run) { setPriority(m_pool.getThreadPriority()); try { if (m_runnable == null) { m_runnable = m_pool.getNextRunnable(); } if (m_runnable != null) { m_runnable.run(); } } catch (InterruptedException e) { LOG.error(Messages.get().getBundle().key(Messages.LOG_THREAD_INTERRUPTED_1, getName()), e); } catch (Throwable t) { LOG.error(Messages.get().getBundle().key(Messages.LOG_THREAD_ERROR_1, getName()), t); } finally { if (runOnce) { m_run = false; } m_runnable = null; } } if (LOG.isDebugEnabled()) { LOG.debug(Messages.get().getBundle().key(Messages.LOG_THREAD_SHUTDOWN_1, getName())); } } /** * Signal the thread that it should terminate.

*/ void shutdown() { m_run = false; } }





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