org.jbpm.pvm.internal.jobexecutor.JobExecutorTimerSession.java Source code

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Here is the source code for org.jbpm.pvm.internal.jobexecutor.JobExecutorTimerSession.java

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/**
 * Copyright (C) 2007  Bull S. A. S.
 * Bull, Rue Jean Jaures, B.P.68, 78340, Les Clayes-sous-Bois
 * 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
 * version 2.1 of the License.
 * 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.
 * You should have received a copy of the GNU Lesser General Public License along with this
 * program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
 * Floor, Boston, MA  02110-1301, USA.
 **/
package org.jbpm.pvm.internal.jobexecutor;

import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.jbpm.api.Execution;
import org.jbpm.api.JbpmException;
import org.jbpm.api.job.Timer;
import org.jbpm.internal.log.Log;
import org.jbpm.pvm.internal.env.Transaction;
import org.jbpm.pvm.internal.job.TimerImpl;
import org.jbpm.pvm.internal.session.TimerSession;

/**
 * Timers created with this service are committed at the end of the transaction,
 * so their execution will be late if the delay is shorter than the transaction.
 * In that case, they will be executed at the end of the transaction.
 * 
 * @author Tom Baeyens, Pascal Verdage
 */
public class JobExecutorTimerSession implements TimerSession {

    private static final Log log = Log.getLog(TimerSession.class.getName());

    /* injected */
    Transaction transaction;

    /* injected */
    JobExecutor jobExecutor;

    /* injected */
    Session session;

    boolean jobExecutorNotificationScheduled = false;

    public void schedule(Timer timer) {
        if (timer == null)
            throw new JbpmException("null timer scheduled");
        if (timer.getExecution() == null)
            throw new JbpmException("timer has no execution specified");
        if ((timer.getSignalName() == null) && (timer.getEventName() == null))
            throw new JbpmException("timer has no signalName or eventName specified");
        if (timer.getDueDate() == null)
            throw new JbpmException("timer scheduled at null date");

        log.debug("scheduling " + timer);
        session.save(timer);

        if ((!jobExecutorNotificationScheduled) && (jobExecutor != null)) {
            jobExecutorNotificationScheduled = true;

            //a transaction is not required (can be null)
            if (transaction != null) {
                transaction.registerSynchronization(new JobAddedNotification(jobExecutor));
            }
        }
    }

    public void cancel(Timer timer) {
        log.debug("canceling " + timer);
        if (timer != null) {
            session.delete(timer);
        } else {
            throw new JbpmException("timer is null");
        }
    }

    public List<Timer> findTimersByExecution(Execution execution) {
        Query query = session.createQuery("select timer " + "from " + TimerImpl.class.getName() + " timer "
                + "where timer.execution = :execution");
        query.setEntity("execution", execution);
        return query.list();
    }
}