de.uzk.hki.da.action.QueueConnector.java Source code

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Here is the source code for de.uzk.hki.da.action.QueueConnector.java

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/*
  DA-NRW Software Suite | ContentBroker
  Copyright (C) 2014 LVRInfoKom
  Landschaftsverband Rheinland
    
  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.
    
  This program 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 General Public License for more details.
    
  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
package de.uzk.hki.da.action;

import java.util.Date;
import java.util.List;

import org.hibernate.Session;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import de.uzk.hki.da.core.HibernateUtil;
import de.uzk.hki.da.model.ConversionInstruction;
import de.uzk.hki.da.model.DAFile;
import de.uzk.hki.da.model.Event;
import de.uzk.hki.da.model.Job;
import de.uzk.hki.da.model.Node;
import de.uzk.hki.da.model.Package;
import de.uzk.hki.da.model.PreservationSystem;

/**
 * @author Daniel M. de Oliveira
 */
public class QueueConnector {

    private static final Logger logger = LoggerFactory.getLogger(QueueConnector.class);

    /**
     * XXX locking synchronized, against itself and against get object need audit
     * 
     * IMPORTANT NOTE: Fetch objects from queue opens a new session.
     *
     * @param status the status
     * @param workingStatus typically a numerical value with three digits, stored as string.
     * working status third digit typically is 2 by convention.
     * @param node the node
     * @return the job
     * @author Daniel M. de Oliveira
     */
    @SuppressWarnings({ "unchecked", "unused" })
    public Job fetchJobFromQueue(String status, String workingStatus, Node node, PreservationSystem pSystem) {
        Session session = HibernateUtil.openSession();
        session.beginTransaction();
        logger.trace("Fetch job for node name " + node.getName());
        List<Job> joblist = null;
        try {
            session.refresh(node);
            session.refresh(pSystem);

            joblist = session.createQuery("SELECT j FROM Job j LEFT JOIN j.obj as o where j.status=?1 and "
                    + "j.responsibleNodeName=?2 and o.object_state IN (100, 50, 40) and o.orig_name!=?3 order by j.date_modified asc ")
                    .setParameter("1", status).setParameter("2", node.getName())
                    .setParameter("3", "integrationTest").setCacheable(false).setMaxResults(1).list();

            if ((joblist == null) || (joblist.isEmpty())) {
                logger.trace("no job found for status {}.", status);
                session.close();
                return null;
            }

            Job job = joblist.get(0);

            // To circumvent lazy initialization issues
            for (ConversionInstruction ci : job.getConversion_instructions()) {
            }
            for (Job j : job.getChildren()) {
            }
            for (Package p : job.getObject().getPackages()) {
                for (DAFile f : p.getFiles()) {
                }
                for (Event e : p.getEvents()) {
                }
            }
            // -
            logger.debug("fetched job with id {} and status {}", job.getId(), job.getStatus());

            job.setStatus(workingStatus);
            job.setDate_modified(String.valueOf(new Date().getTime() / 1000L));
            session.merge(job);
            session.getTransaction().commit();
            session.close();

            logger.debug("fetched job with id {} and set status to {}", job.getId(), job.getStatus());

        } catch (Exception e) {
            session.close();
            logger.error("Caught error in fetchJobFromQueue");

            throw new RuntimeException(e.getMessage(), e);
        }
        return joblist.get(0);
    }
}