/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This 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; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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 software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jbpm.jobexecutor;
import java.util.Date;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.jbpm.PvmException;
import org.jbpm.client.Command;
import org.jbpm.client.CommandService;
import org.jbpm.env.Environment;
import org.jbpm.env.session.Job;
import org.jbpm.tx.Transaction;
/**
* @author Tom Baeyens
*/
public class ExecuteJobCommand implements Command {
private static final Logger log = Logger.getLogger(ExecuteJobCommand.class.getName());
protected long jobDbid;
public ExecuteJobCommand(long jobDbid) {
this.jobDbid = jobDbid;
}
public Object execute(Environment environment) throws Exception {
Job job = environment.get(JobSession.class).get(jobDbid);
try {
log.fine("executing job "+job+"...");
job.execute(environment);
// if this job is locked too long, it could be unlocked by the lockmonitor and
// executed by another thread.
Date lockExpirationDate = job.getLockExpirationTime();
//can be null if it was rescheduled
if (lockExpirationDate != null) {
long lockExpiration = lockExpirationDate.getTime();
long currentTime = System.currentTimeMillis();
if (currentTime>lockExpiration) {
throw new PvmException("job took too long: lock expired "+(currentTime-lockExpiration)+"ms ago");
}
}
} catch (Throwable exception) {
log.log(Level.SEVERE, "exception while executing '"+job+"'", exception);
handleJobExecutionException(environment, job, exception);
}
log.fine("executed job "+job);
return null;
}
/** This transaction will be marked for rollback. A command will be associated with the
* Transaction.EVENT_AFTERCOMPLETION (after the job locks of the current transaction are
* released). Then the command will update the Job with the exception details in a separate
* transaction. */
protected void handleJobExecutionException(Environment environment, Job job, Throwable exception) {
Transaction transaction = environment.getTransaction();
transaction.setRollbackOnly();
CommandService commandService = (CommandService) environment.get(CommandService.class);
JobExceptionHandler jobExceptionHandler = new JobExceptionHandler(job.getDbid(), exception, commandService);
transaction.addListener(jobExceptionHandler, Transaction.EVENT_AFTERCOMPLETION);
}
}