StudyUpdateSessionEJB.java

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 * The Original Code is part of dcm4che, an implementation of DICOM(TM) in
 * Java(TM), hosted at https://github.com/gunterze/dcm4che.
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package org.dcm4chee.archive.store.session;

import org.dcm4che3.net.Device;
import org.dcm4chee.archive.conf.StoreAction;
import org.dcm4chee.archive.entity.Study;
import org.dcm4chee.archive.entity.StudyUpdateSession;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.ejb.Asynchronous;
import javax.ejb.Stateless;
import javax.inject.Inject;
import javax.persistence.*;
import java.util.Date;
import java.util.List;

/**
 * @author Gunter Zeilinger <gunterze@gmail.com>
 * @author Umberto Cappellini
 * @author Roman K
 */

@Stateless
public class StudyUpdateSessionEJB {
    private static final Logger LOG = LoggerFactory.getLogger(StudyUpdateSessionEJB.class);

    @PersistenceContext(name = "dcm4chee-arc", unitName = "dcm4chee-arc")
    private EntityManager em;

    @Inject
    Device device;

    /**
     * Adds/updates existing StudyUpdateSession entity with information about currently stored study
     */
    @SuppressWarnings("unchecked")
    @Asynchronous
    public void addStoredInstance(String sourceAET,
                                  String localAET,
                                  String studyInstanceUID,
                                  String seriesInstanceUID,
                                  String sopInstanceUID,
                                  StoreAction storeAction,
                                  int emulationDelaySec) {

        Date emulationTime = new Date(System.currentTimeMillis() + emulationDelaySec * 1000L);

        try {
            // try to find an existing study update session
            StudyUpdateSession entity = em
                    .createNamedQuery(
                            StudyUpdateSession.FIND_BY_STUDY_INSTANCE_UID_AND_SOURCE_AET,
                            StudyUpdateSession.class)
                    .setParameter(1, studyInstanceUID)
                    .setParameter(2, sourceAET)
                    .getSingleResult();

            // lock the row to ensure 'storedInstances' stays consistent
            // we are neither on critical path nor blocking other c-stores
            em.lock(entity, LockModeType.PESSIMISTIC_WRITE);

            // bump the timeout
            entity.setEmulationTime(emulationTime);

            // add stored instance, affected series 
            entity.getPendingStudyUpdatedEvent().addStoredInstance(localAET, sopInstanceUID, seriesInstanceUID, storeAction);

            em.merge(entity);
            LOG.debug("Modified study update session for Study[iuid={}] received from {}", studyInstanceUID, sourceAET);

        } catch (NoResultException nre) {

            // create new study update session
            StudyUpdateSession entity = new StudyUpdateSession();
            entity.setSourceAET(sourceAET);
            entity.setStudyInstanceUID(studyInstanceUID);
            entity.setEmulationTime(emulationTime);

            entity.getPendingStudyUpdatedEvent().setSourceAET(sourceAET);
            entity.getPendingStudyUpdatedEvent().setStudyInstanceUID(studyInstanceUID);
            entity.getPendingStudyUpdatedEvent().addStoredInstance(localAET, sopInstanceUID, seriesInstanceUID, storeAction);

            em.persist(entity);

            LOG.info("Created study update session for Study[iuid={}] received from {}", studyInstanceUID, sourceAET);
        }
    }

    public StudyUpdatedEvent findNextFinishedStudyUpdateSession() {
        List<StudyUpdateSession> resultList = em
                .createNamedQuery(StudyUpdateSession.FIND_READY_TO_FINISH, StudyUpdateSession.class)
                .setMaxResults(1)
                .getResultList();

        if (resultList.isEmpty()) return null;

        StudyUpdateSession studyUpdateSession = resultList.get(0);
        em.remove(studyUpdateSession);
        return studyUpdateSession.getPendingStudyUpdatedEvent();
    }


    // temporarily here...
    public Study findStudyByUID(String studyUID) {
        String queryStr = "SELECT s FROM Study s JOIN FETCH s.series se WHERE s.studyInstanceUID = ?1";
        Query query = em.createQuery(queryStr);
        Study study = null;
        try {
            query.setParameter(1, studyUID);
            study = (Study) query.getSingleResult();
        } catch (NoResultException ignored) {
        }
        return study;
    }

}