    001package org.apache.turbine.services.schedule;
    002
    003/*
    004 * Licensed to the Apache Software Foundation (ASF) under one
    005 * or more contributor license agreements.  See the NOTICE file
    006 * distributed with this work for additional information
    007 * regarding copyright ownership.  The ASF licenses this file
    008 * to you under the Apache License, Version 2.0 (the
    009 * "License"); you may not use this file except in compliance
    010 * with the License.  You may obtain a copy of the License at
    011 *
    012 *   http://www.apache.org/licenses/LICENSE-2.0
    013 *
    014 * Unless required by applicable law or agreed to in writing,
    015 * software distributed under the License is distributed on an
    016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    017 * KIND, either express or implied.  See the License for the
    018 * specific language governing permissions and limitations
    019 * under the License.
    020 */
    021
    022import org.apache.commons.logging.Log;
    023import org.apache.commons.logging.LogFactory;
    024import org.apache.turbine.modules.ScheduledJobLoader;
    025
    026/**
    027 * Wrapper for a <code>JobEntry</code> to actually perform the job's action.
    028 *
    029 * @author <a href="mailto:mbryson@mont.mindspring.com">Dave Bryson</a>
    030 * @author <a href="mailto:dlr@finemaltcoding.com">Daniel Rall</a>
    031 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
    032 * @author <a href="mailto:quintonm@bellsouth.net">Quinton McCombs</a>
    033 * @version $Id: WorkerThread.java 534527 2007-05-02 16:10:59Z tv $
    034 */
    035public class WorkerThread
    036        implements Runnable
    037{
    038    /**
    039     * The <code>JobEntry</code> to run.
    040     */
    041    private JobEntry je = null;
    042
    043    /** Logging */
    044    private static Log log = LogFactory.getLog(ScheduleService.LOGGER_NAME);
    045
    046    /**
    047     * Creates a new worker to run the specified <code>JobEntry</code>.
    048     *
    049     * @param je The <code>JobEntry</code> to create a worker for.
    050     */
    051    public WorkerThread(JobEntry je)
    052    {
    053        this.je = je;
    054    }
    055
    056    /**
    057     * Run the job.
    058     */
    059    @Override
    060    public void run()
    061    {
    062        if (je == null || je.isActive())
    063        {
    064            return;
    065        }
    066
    067        try
    068        {
    069            if (!je.isActive())
    070            {
    071                je.setActive(true);
    072                logStateChange("started");
    073                ScheduledJobLoader.getInstance().exec(je, je.getTask());
    074            }
    075        }
    076        catch (Exception e)
    077        {
    078            log.error("Error in WorkerThread for scheduled job #" +
    079                    je.getJobId() + ", task: " + je.getTask(), e);
    080        }
    081        finally
    082        {
    083            if (je.isActive())
    084            {
    085                je.setActive(false);
    086                logStateChange("completed");
    087            }
    088        }
    089    }
    090
    091    /**
    092     * Macro to log <code>JobEntry</code> status information.
    093     *
    094     * @param state The new state of the <code>JobEntry</code>.
    095     */
    096    private final void logStateChange(String state)
    097    {
    098        log.debug("Scheduled job #" + je.getJobId() + ' ' + state +
    099                ", task: " + je.getTask());
    100    }
    101}