jtajobrunshellfactory.java

定时器开源项目, 相对于 jcrontab, Quartz 算是更完整的一个项目, 随著开发的版本上来, 他已经脱离只是写在程序里面的计时器, 在指定的时间或区间, 处理所指定的事件. 也加入了 se

/*
 * Copyright James House (c) 2001-2004
 * 
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met: 1.
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer. 2. Redistributions in
 * binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other
 * materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *  
 */
package org.quartz.ee.jta;

import javax.naming.InitialContext;

import org.quartz.Scheduler;
import org.quartz.SchedulerConfigException;
import org.quartz.core.JobRunShell;
import org.quartz.core.JobRunShellFactory;
import org.quartz.core.SchedulingContext;

/**
 * <p>
 * Responsible for creating the instances of <code>{@link org.quartz.ee.jta.JTAJobRunShell}</code>
 * to be used within the <class>{@link org.quartz.core.QuartzScheduler}
 * </code> instance.
 * </p>
 * 
 * <p>
 * This implementation does not re-use any objects, it simply makes a new
 * JTAJobRunShell each time <code>borrowJobRunShell()</code> is called.
 * </p>
 * 
 * @author James House
 */
public class JTAJobRunShellFactory implements JobRunShellFactory {

    /*
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     * 
     * Data members.
     * 
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     */

    private Scheduler scheduler;

    private SchedulingContext schedCtxt;

    private InitialContext initCtxt;

    private UserTransactionHelper userTxHelper;

    /*
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     * 
     * Constructors.
     * 
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     */

    public JTAJobRunShellFactory(UserTransactionHelper userTxHelper) {
        this.userTxHelper = userTxHelper;
    }

    /*
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     * 
     * Interface.
     * 
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     */

    /**
     * <p>
     * Initialize the factory, providing a handle to the <code>Scheduler</code>
     * that should be made available within the <code>JobRunShell</code> and
     * the <code>JobExecutionContext</code> s within it, and a handle to the
     * <code>SchedulingContext</code> that the shell will use in its own
     * operations with the <code>JobStore</code>.
     * </p>
     */
    public void initialize(Scheduler scheduler, SchedulingContext schedCtxt)
            throws SchedulerConfigException {
        this.scheduler = scheduler;
        this.schedCtxt = schedCtxt;
    }

    /**
     * <p>
     * Called by the <class>{@link org.quartz.core.QuartzSchedulerThread}
     * </code> to obtain instances of <code>
     * {@link org.quartz.core.JobRunShell}</code>.
     * </p>
     */
    public JobRunShell borrowJobRunShell() {
        return new JTAJobRunShell(this, scheduler, schedCtxt, userTxHelper);
    }

    /**
     * <p>
     * Called by the <class>{@link org.quartz.core.QuartzSchedulerThread}
     * </code> to return instances of <code>
     * {@link org.quartz.core.JobRunShell}</code>.
     * </p>
     */
    public void returnJobRunShell(JobRunShell jobRunShell) {
        jobRunShell.passivate();
    }

}