Package org.jbpm.jobexecutor

Source Code of org.jbpm.jobexecutor.ExecuteJobCommand

/*
* 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);
  }
}
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