public long getNextVersion() {
VersionTrackerDAOImpl vt = null;
Query query = _em.createQuery("select v from VersionTrackerDAOImpl v");
query.setHint("openjpa.FetchPlan.ReadLockMode", "WRITE");
List<VersionTrackerDAOImpl> res = query.getResultList();
if (!res.isEmpty()) vt = res.get(0);
if (vt == null) {
vt = new VersionTrackerDAOImpl();
vt.setVersion(1);
} else {
vt.setVersion(vt.getVersion() + 1);
}
_em.persist(vt);
return vt.getVersion();
}
public void setVersion(long version) {
VersionTrackerDAOImpl vt = null;
Query query = _em.createQuery("select v from VersionTrackerDAOImpl v");
query.setHint("openjpa.FetchPlan.ReadLockMode", "WRITE");
List<VersionTrackerDAOImpl> res = query.getResultList();
if (!res.isEmpty()) vt = res.get(0);
if (vt == null) vt = new VersionTrackerDAOImpl();
vt.setVersion(version);
_em.persist(vt);
}