001    package 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    
022    import org.apache.commons.logging.Log;
023    import org.apache.commons.logging.LogFactory;
024    import 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     */
035    public 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        public void run()
060        {
061            if (je == null || je.isActive())
062            {
063                return;
064            }
065    
066            try
067            {
068                if (!je.isActive())
069                {
070                    je.setActive(true);
071                    logStateChange("started");
072                    ScheduledJobLoader.getInstance().exec(je, je.getTask());
073                }
074            }
075            catch (Exception e)
076            {
077                log.error("Error in WorkerThread for scheduled job #" +
078                        je.getPrimaryKey() + ", task: " + je.getTask(), e);
079            }
080            finally
081            {
082                if (je.isActive())
083                {
084                    je.setActive(false);
085                    logStateChange("completed");
086                }
087            }
088        }
089    
090        /**
091         * Macro to log <code>JobEntry</code> status information.
092         *
093         * @param state The new state of the <code>JobEntry</code>.
094         */
095        private final void logStateChange(String state)
096        {
097            log.debug("Scheduled job #" + je.getPrimaryKey() + ' ' + state +
098                    ", task: " + je.getTask());
099        }
100    }