@Override
 public void insertSaga(
     Class<?> sagaType,
     String sagaIdentifier,
     Object saga,
     TrackingToken token,
     Set<AssociationValue> associationValues) {
   EntityManager entityManager = entityManagerProvider.getEntityManager();
   SagaEntry<?> entry = new SagaEntry<>(saga, sagaIdentifier, serializer);
   entityManager.persist(entry);
   for (AssociationValue associationValue : associationValues) {
     storeAssociationValue(entityManager, sagaType, sagaIdentifier, associationValue);
   }
   if (logger.isDebugEnabled()) {
     logger.debug(
         "Storing saga id {} as {}",
         sagaIdentifier,
         new String(entry.getSerializedSaga(), Charset.forName("UTF-8")));
   }
   if (useExplicitFlush) {
     entityManager.flush();
   }
 }
 @Override
 public void updateSaga(
     Class<?> sagaType,
     String sagaIdentifier,
     Object saga,
     TrackingToken token,
     AssociationValues associationValues) {
   EntityManager entityManager = entityManagerProvider.getEntityManager();
   SagaEntry<?> entry = new SagaEntry<>(saga, sagaIdentifier, serializer);
   if (logger.isDebugEnabled()) {
     logger.debug(
         "Updating saga id {} as {}",
         sagaIdentifier,
         new String(entry.getSerializedSaga(), Charset.forName("UTF-8")));
   }
   int updateCount =
       entityManager
           .createNamedQuery(UPDATE_SAGA_NAMED_QUERY)
           .setParameter("serializedSaga", entry.getSerializedSaga())
           .setParameter("revision", entry.getRevision())
           .setParameter("sagaId", entry.getSagaId())
           .setParameter("sagaType", entry.getSagaType())
           .executeUpdate();
   for (AssociationValue associationValue : associationValues.addedAssociations()) {
     storeAssociationValue(entityManager, sagaType, sagaIdentifier, associationValue);
   }
   for (AssociationValue associationValue : associationValues.removedAssociations()) {
     removeAssociationValue(entityManager, sagaType, sagaIdentifier, associationValue);
   }
   if (updateCount == 0) {
     logger.warn("Expected to be able to update a Saga instance, but no rows were found.");
   }
   if (useExplicitFlush) {
     entityManager.flush();
   }
 }