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Turbine is a servlet based framework that allows experienced Java developers to quickly build secure web applications. Parts of Turbine can also be used independently of the web portion of Turbine as well. In other words, we strive to make portions of Turbine easily available for use in other applications.

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package org.apache.turbine.services.schedule;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.turbine.modules.ScheduledJobLoader;

/**
 * Wrapper for a JobEntry to actually perform the job's action.
 *
 * @author Dave Bryson
 * @author Daniel Rall
 * @author Henning P. Schmiedehausen
 * @author Quinton McCombs
 * @version $Id: WorkerThread.java 534527 2007-05-02 16:10:59Z tv $
 */
public class WorkerThread
        implements Runnable
{
    /**
     * The JobEntry to run.
     */
    private JobEntry je = null;

    /** Logging */
    private static Log log = LogFactory.getLog(ScheduleService.LOGGER_NAME);

    /**
     * Creates a new worker to run the specified JobEntry.
     *
     * @param je The JobEntry to create a worker for.
     */
    public WorkerThread(JobEntry je)
    {
        this.je = je;
    }

    /**
     * Run the job.
     */
    @Override
    public void run()
    {
        if (je == null || je.isActive())
        {
            return;
        }

        try
        {
            if (!je.isActive())
            {
                je.setActive(true);
                logStateChange("started");
                ScheduledJobLoader.getInstance().exec(je, je.getTask());
            }
        }
        catch (Exception e)
        {
            log.error("Error in WorkerThread for scheduled job #" +
                    je.getJobId() + ", task: " + je.getTask(), e);
        }
        finally
        {
            if (je.isActive())
            {
                je.setActive(false);
                logStateChange("completed");
            }
        }
    }

    /**
     * Macro to log JobEntry status information.
     *
     * @param state The new state of the JobEntry.
     */
    private final void logStateChange(String state)
    {
        log.debug("Scheduled job #" + je.getJobId() + ' ' + state +
                ", task: " + je.getTask());
    }
}