public O2MSyncDataLoader getPendingDataLoader() {
    O2MSyncDataLoader loader = null;
    Document document = syncEventDoc.findOneAndUpdate(
            Filters.and(Filters.eq(SyncAttrs.STATUS,SyncStatus.PENDING),Filters.eq(SyncAttrs.EVENT_TYPE,String.valueOf(EventType.System))),Updates.set(SyncAttrs.STATUS,SyncStatus.IN_PROGRESS),new FindOneAndUpdateOptions().returnDocument(ReturnDocument.AFTER)
                    .projection(Projections.include(SyncAttrs.soURCE_DB_NAME,SyncAttrs.soURCE_USER_NAME)));
    if (document != null && !document.isEmpty()) {
        Object interval = document.get(SyncAttrs.INTERVAL);
        String appName = document.getString(SyncAttrs.APPLICATION_NAME);
        if(interval!=null && interval instanceof Long){
            loader = new O2MSyncDataLoader((Long)interval,appName);
        }else{
            loader = new O2MSyncDataLoader(120000,appName);
        }
        loader.setEventId(document.getobjectId(SyncAttrs.ID));
        loader.setdbname(document.getString(SyncAttrs.soURCE_DB_NAME));
        loader.setDbUserName(document.getString(SyncAttrs.soURCE_USER_NAME));
        loader.setStatus(document.getString(SyncAttrs.STATUS));
    }
    return loader;
}

@Override
public Dataset write(Dataset dataset) {
  // we populate this on first write and retain it thereafter
  if (isBlank(dataset.getId())) {
    dataset.setId(ObjectId.get().toString());
  }

  Observable<Document> observable =
      getCollection()
          .findOneAndReplace(
              Filters.eq("id",dataset.getId()),documentTransformer.transform(dataset),new FindOneAndReplaceOptions().upsert(true).returnDocument(ReturnDocument.AFTER));

  return documentTransformer.transform(Dataset.class,observable.toBlocking().single());
}

@Override
public Optional<T> peek() {
    final Bson peekQuery = QueryUtil.generatePeekQuery(defaultHeartbeatExpirationMillis);

    final Document update = new Document();
    update.put("heartbeat",new Date());
    update.put("status",OkraStatus.PROCESSING.name());

    final FindOneAndUpdateOptions options = new FindOneAndUpdateOptions();
    options.returnDocument(ReturnDocument.AFTER);

    final Document document = client
            .getDatabase(getDatabase())
            .getCollection(getCollection())
            .findOneAndUpdate(peekQuery,new Document("$set",update),options);

    if (document == null) {
        return Optional.empty();
    }

    return Optional.ofNullable(serializer.fromDocument(scheduleItemClass,document));
}

@Test
public void updatePojotest() {

    Bson update = combine(set("user","Jim"),set("action",Action.DELETE),// unfortunately at this point we need to provide a non generic class,so the codec is able to determine all types
            // remember: type erasure makes it impossible to retrieve type argument values at runtime
            // @todo provide a mechanism to generate non-generic class on the fly. Is that even possible ?
            // set("listofpolymorphicTypes",buildNonGenericclassOnTheFly(Arrays.asList(new A(123),new B(456f)),List.class,Type.class),set("listofpolymorphicTypes",new polymorphicTypeList(Arrays.asList(new A(123),new B(456f)))),currentDate("creationDate"),currentTimestamp("_id"));

    FindOneAndUpdateOptions findOptions = new FindOneAndUpdateOptions();
    findOptions.upsert(true);
    findOptions.returnDocument(ReturnDocument.AFTER);

    MongoCollection<Pojo> pojoMongoCollection = mongoClient.getDatabase("test").getCollection("documents").withDocumentClass(Pojo.class);

    Pojo pojo = pojoMongoCollection.findOneAndUpdate(Filters.and(Filters.lt(DBCollection.ID_FIELD_NAME,0),Filters.gt(DBCollection.ID_FIELD_NAME,0)),update,findOptions);

    assertNotNull(pojo.id);
}

private SmofInsertResult replace(T element,SmofOpOptions options) {
    final SmofInsertResult result = new SmofInsertResultImpl();
    result.setSuccess(true);
    options.upsert(true);
    if(options.isBypassCache() || !cache.asMap().containsValue(element)) {
        final BsonDocument document = parser.toBson(element);
        final Bson query = createUniquenessQuery(document);
        result.setPostInserts(BsonUtils.extrackPosInsertions(document));
        options.setReturnDocument(ReturnDocument.AFTER);
        document.remove(Element.ID);
        final BsonDocument resdoc = collection.findOneAndReplace(query,document,options.toFindOneAndReplace());
        element.setId(resdoc.get(Element.ID).asObjectId().getValue());
        cache.put(element.getId(),element);
    }
    return result;
}

@Override
public Long getNextIdGen(Long interval) {
    Document realUpdate = getIncUpdateObject(getUpdateObject(interval));
    FindOneAndUpdateOptions options = new FindOneAndUpdateOptions()
            .upsert(true)
            .returnDocument(ReturnDocument.AFTER);

    Document ret = getIdGenCollection().findOneAndUpdate(getQueryObject(),realUpdate,options);
    if (ret == null) return null;

    Boolean valid = (Boolean) ret.get(VALID);
    if (valid != null && !valid) {
        throw RaptureExceptionFactory.create(HttpURLConnection.HTTP_BAD_REQUEST,mongoMsgCatalog.getMessage("IdGenerator"));
    }
    return (Long) ret.get(SEQ);
}

@Override
public void updateRow(String rowId,Map<String,Object> recordValues) {
    String key = getKey(rowId); // stupid key is row id plus "l/" prepended
                                // to it

    MongoCollection<Document> collection = MongoDBFactory.getCollection(instanceName,tableName);
    Document query = new Document();
    query.put(KEY,key);
    Document toPut = new Document();
    toPut.put(KEY,key);
    toPut.put(ROWID,rowId);
    toPut.put(EPOCH,EpochManager.nextEpoch(collection));
    toPut.putAll(recordValues);

    FindOneAndUpdateOptions options = new FindOneAndUpdateOptions().upsert(true).returnDocument(ReturnDocument.AFTER);

    @SuppressWarnings("unused")
    Document ret = collection.findOneAndUpdate(query,new Document($SET,toPut),options);
}

@ExtDirectMethod(ExtDirectMethodType.FORM_POST)
public ExtDirectFormPostResult resetRequest(
        @RequestParam("email") String emailOrLoginName) {

    String token = UUID.randomUUID().toString();

    User user = this.mongoDb.getCollection(User.class).findOneAndUpdate(
            Filters.and(
                    Filters.or(Filters.eq(CUser.email,emailOrLoginName),Filters.eq(CUser.loginName,emailOrLoginName)),Filters.eq(CUser.deleted,false)),Updates.combine(
                    Updates.set(CUser.passwordResetTokenValidUntil,Date.from(zoneddatetime.Now(ZoneOffset.UTC).plusHours(4)
                                    .toInstant())),Updates.set(CUser.passwordResetToken,token)),new FindOneAndUpdateOptions().returnDocument(ReturnDocument.AFTER)
                    .upsert(false));

    if (user != null) {
        this.mailService.sendPasswortResetEmail(user);
    }

    return new ExtDirectFormPostResult();
}

/**
 * Saves a set of {@link ProtectedRegion} for the specified world to database.
 *
 * @param world The name of the world
 * @param set The {@link Set} of regions
 * @throws StorageException Thrown if something goes wrong during database query
 */
public void saveAll(final String world,Set<ProtectedRegion> set) throws StorageException {
    MongoCollection<ProcessingProtectedRegion> collection = getCollection();
    final atomicreference<Throwable> lastError = new atomicreference<>();
    final CountDownLatch waiter = new CountDownLatch(set.size());
    for (final ProtectedRegion region : set) {
        if (listener != null)
            listener.beforeDatabaseUpdate(world,region);
        collection.findOneAndUpdate(
                Filters.and(Filters.eq("name",region.getId()),Filters.eq("world",world)),new ProcessingProtectedRegion(region,new FindOneAndUpdateOptions().upsert(true).returnDocument(ReturnDocument.AFTER),OperationResultCallback.create(lastError,waiter,new UpdateCallback(world))
        );
    }
    ConcurrentUtils.safeAwait(waiter);
    Throwable realLastError = lastError.get();
    if (realLastError != null)
        throw new StorageException("An error occurred while saving or updating in MongoDB.",realLastError);
}

@Override
public io.vertx.ext.mongo.MongoClient findOneAndUpdateWithOptions(String collection,JsonObject query,JsonObject update,FindOptions findOptions,UpdateOptions updateOptions,Handler<AsyncResult<JsonObject>> resultHandler) {
  requireNonNull(collection,"collection cannot be null");
  requireNonNull(query,"query cannot be null");
  requireNonNull(update,"update cannot be null");
  requireNonNull(findOptions,"find options cannot be null");
  requireNonNull(updateOptions,"update options cannot be null");
  requireNonNull(resultHandler,"resultHandler cannot be null");

  JsonObject encodedQuery = encodeKeyWhenUSEObjectId(query);

  Bson bquery = wrap(encodedQuery);
  Bson bupdate = wrap(update);
  FindOneAndUpdateOptions foauOptions = new FindOneAndUpdateOptions();
  foauOptions.sort(wrap(findOptions.getSort()));
  foauOptions.projection(wrap(findOptions.getFields()));
  foauOptions.upsert(updateOptions.isUpsert());
  foauOptions.returnDocument(updateOptions.isReturningNewDocument() ? ReturnDocument.AFTER : ReturnDocument.BEFORE);

  MongoCollection<JsonObject> coll = getCollection(collection);
  coll.findOneAndUpdate(bquery,bupdate,foauOptions,wrapCallback(resultHandler));
  return this;
}

@Override
public io.vertx.ext.mongo.MongoClient findOneAndReplaceWithOptions(String collection,JsonObject replace,"query cannot be null");
  requireNonNull(findOptions,"resultHandler cannot be null");

  JsonObject encodedQuery = encodeKeyWhenUSEObjectId(query);

  Bson bquery = wrap(encodedQuery);
  FindOneAndReplaceOptions foarOptions = new FindOneAndReplaceOptions();
  foarOptions.sort(wrap(findOptions.getSort()));
  foarOptions.projection(wrap(findOptions.getFields()));
  foarOptions.upsert(updateOptions.isUpsert());
  foarOptions.returnDocument(updateOptions.isReturningNewDocument() ? ReturnDocument.AFTER : ReturnDocument.BEFORE);

  MongoCollection<JsonObject> coll = getCollection(collection);
  coll.findOneAndReplace(bquery,replace,foarOptions,wrapCallback(resultHandler));
  return this;
}

/**
 * Configures this modifier so that new (updated) version of document will be returned in
 * case of successful update.
 * @see #returningOld()
 * @return {@code this} modifier for chained invocation
 */
// safe unchecked: we expect I to be a self type
@SuppressWarnings("unchecked")
public final M returningNew() {
  options.returnDocument(ReturnDocument.AFTER);
  return (M) this;
}

@Override
public Optional<T> reschedule(final T item) {
    validateReschedule(item);

    final Document query = new Document();
    query.put("_id",new ObjectId(item.getId()));
    query.put("heartbeat",DateUtil.toDate(item.getHeartbeat()));

    final Document setDoc = new Document();
    setDoc.put("heartbeat",null);
    setDoc.put("runDate",DateUtil.toDate(item.getRunDate()));
    setDoc.put("status",OkraStatus.PENDING.name());

    final Document update = new Document();
    update.put("$set",setDoc);

    final FindOneAndUpdateOptions options = new FindOneAndUpdateOptions();
    options.returnDocument(ReturnDocument.AFTER);

    final Document document = client
            .getDatabase(getDatabase())
            .getCollection(getCollection())
            .findOneAndUpdate(query,document));
}

@Override
public Optional<T> heartbeatandUpdateCustomAttrs(final T item,final Map<String,Object> attrs) {
    validateHeartbeat(item);

    final Document query = new Document();
    query.put("_id",new ObjectId(item.getId()));
    query.put("status",OkraStatus.PROCESSING.name());
    query.put("heartbeat",DateUtil.toDate(item.getHeartbeat()));

    final Document update = new Document();
    update.put("$set",new Document("heartbeat",new Date()));

    if (attrs != null && !attrs.isEmpty()) {
        attrs.forEach((key,value) -> update.append("$set",new Document(key,value)));
    }

    final FindOneAndUpdateOptions options = new FindOneAndUpdateOptions();
    options.returnDocument(ReturnDocument.AFTER);

    final Document result = client
            .getDatabase(getDatabase())
            .getCollection(getCollection())
            .findOneAndUpdate(query,options);

    if (result == null) {
        return Optional.empty();
    }

    return Optional.ofNullable(serializer.fromDocument(scheduleItemClass,result));
}

public SyncMap saveMapping(SyncMap map) {
    // Todo : check why this is needed
    if (map.getMapId() == null) {
        map.setMapId(new ObjectId());
    }
    return syncMappings.findOneAndReplace(Filters.eq(SyncAttrs.ID,map.getMapId()),map,new FindOneAndReplaceOptions().returnDocument(ReturnDocument.AFTER).upsert(true));
}

public SyncEvent getPendingEvent(List<String> eventTypes) {
    return syncEvents.findOneAndUpdate(
            Filters.and(Filters.eq(SyncAttrs.STATUS,Filters.in(SyncAttrs.EVENT_TYPE,eventTypes)),new FindOneAndUpdateOptions().returnDocument(ReturnDocument.AFTER));
}

public SyncEvent saveEvent(SyncEvent event) {
    if (event.getEventId() == null) {
        event.setEventId(new ObjectId());
    }
    return syncEvents.findOneAndReplace(Filters.eq(SyncAttrs.ID,event.getEventId()),event,new FindOneAndReplaceOptions().returnDocument(ReturnDocument.AFTER).upsert(true));
}

public SyncConnectionInfo updateConnection(SyncConnectionInfo connInfo) {
    if(connInfo.getConnectionId() == null){
        connInfo.setConnectionId(new ObjectId());
    }
    return connectionInfo.findOneAndReplace(
            Filters.eq(String.valueOf(ConnectionInfoAttributes._id),connInfo.getConnectionId()),connInfo,new FindOneAndReplaceOptions().returnDocument(ReturnDocument.AFTER).upsert(true));
}

public SyncNode getFailedNode(long lastPingTime) {
    SyncNode FailedNode = syncNodeMapping.findOneAndUpdate(
            Filters.and(Filters.lte(SyncAttrs.LAST_PING_TIME,lastPingTime),Filters.eq(SyncAttrs.LIFE_CYCLE,SyncConfig.INSTANCE.getDbProperty(SyncConstants.LIFE))),Updates.set(SyncAttrs.LAST_PING_TIME,System.currentTimeMillis()),new FindOneAndUpdateOptions().upsert(false).returnDocument(ReturnDocument.BEFORE));
    if (FailedNode != null && FailedNode.getFailureTime() == 0) {
        syncNodeMapping.findOneAndUpdate(Filters.eq(SyncAttrs.ID,FailedNode.getId()),Updates.set(SyncAttrs.FAILURE_TIME,FailedNode.getLastPingTime()));
    }
    return FailedNode;
}

public MngToOrclSyncWriter(BlockingQueue<Document> dataBuffer,MongoToOracleMap map,Syncmarker marker,CountDownLatch latch,boolean isRestrictedSyncEnabled,ObjectId eventId) {
    super();
    this.dataBuffer = dataBuffer;
    this.map = map;
    this.marker = marker;
    this.latch = latch;
    this.isRestrictedSyncEnabled = isRestrictedSyncEnabled;
    this.eventId = eventId;
    this.options = new FindOneAndUpdateOptions();
    options.returnDocument(ReturnDocument.BEFORE);
}

public String createNewLotCodeForTransportation() {
    Document updateLotCode = collection.findOneAndUpdate(exists("lotConfiguration.lastInsertionTransportation"),new Document("$inc",new Document("lotConfiguration.lastInsertionTransportation",1)),new FindOneAndUpdateOptions().returnDocument(ReturnDocument.AFTER));

    LaboratoryConfiguration laboratoryConfiguration = LaboratoryConfiguration.deserialize(updateLotCode.toJson());

    return laboratoryConfiguration.getLotConfiguration().getLastInsertionTransportation().toString();
}

public String createNewLotCodeForExam() {
    Document updateLotCode = collection.findOneAndUpdate(exists("lotConfiguration.lastInsertionExam"),new Document("lotConfiguration.lastInsertionExam",new FindOneAndUpdateOptions().returnDocument(ReturnDocument.AFTER));

    LaboratoryConfiguration laboratoryConfiguration = LaboratoryConfiguration.deserialize(updateLotCode.toJson());

    return laboratoryConfiguration.getLotConfiguration().getLastInsertionExam().toString();
}

@Override
public void execUpdate(Bson filter,Bson update,SmofOpOptions options) {
    options.setReturnDocument(ReturnDocument.AFTER);
    final BsonDocument result = collection.findOneAndUpdate(filter,options.toFindOneAndUpdateOptions());
    final T element = parser.fromBson(result,type);
    cache.put(result.getobjectId(Element.ID).getValue(),element);
}

@Override
public void put(String key,String value) {
    MongoCollection<Document> collection = getCollection();
    Document query = new Document(KEY,key);
    Document toPut = new Document($SET,new Document(KEY,key).append(VALUE,value));

    FindOneAndUpdateOptions options = new FindOneAndUpdateOptions().upsert(true).returnDocument(ReturnDocument.BEFORE);
    Document result = collection.findOneAndUpdate(query,toPut,options);

    if (needsFolderHandling && result == null) {
        dirRepo.registerParentage(key);
    }
}

private void saveDocument(String key,String column,Object val) {
    registerKey(key);
    MongoCollection<Document> collection = getCollection(key);
    Document dbkey = new Document(ROWKEY,key).append(COLKEY,column);
    Document dbval = new Document($SET,new Document(ROWKEY,column).append(VALKEY,val));
    FindOneAndUpdateOptions options = new FindOneAndUpdateOptions().upsert(true).returnDocument(ReturnDocument.AFTER);
    try {
        @SuppressWarnings("unused")
        Document ret = collection.findOneAndUpdate(dbkey,dbval,options);
    } catch (MongoException me) {
        throw RaptureExceptionFactory.create(HttpURLConnection.HTTP_INTERNAL_ERROR,new ExceptionToString(me));
    }
}

/**
 * Returns the next epoch available and advances the counter. Guaranteed to
 * be unique for the given collection. If the epoch document does not
 * already exist a new one is created and the first epoch returned will be
 * 1L.
 * 
 * @param collection
 *            - the MongoCollection to the get next epoch for
 * @return Long - a unique epoch value for this collection
 */
public static Long nextEpoch(final MongoCollection<Document> collection) {
    final FindOneAndUpdateOptions options = new FindOneAndUpdateOptions().upsert(true).returnDocument(ReturnDocument.AFTER);

    MongoRetryWrapper<Long> wrapper = new MongoRetryWrapper<Long>() {
        public Long action(FindIterable<Document> cursor) {
            Document ret = collection.findOneAndUpdate(getEpochQueryObject(),getIncUpdateObject(getUpdateObject()),options);
            return (Long) ret.get(SEQ);
        }
    };
    return wrapper.doAction();
}

@ExtDirectMethod
public void sendPassordResetEmail(String userId) {
    String token = UUID.randomUUID().toString();

    User user = this.mongoDb.getCollection(User.class).findOneAndUpdate(
            Filters.eq(CUser.id,userId),new FindOneAndUpdateOptions().returnDocument(ReturnDocument.AFTER));

    this.mailService.sendPasswortResetEmail(user);
}

@Override
public void onAuthenticationSuccess(HttpServletRequest request,HttpServletResponse response,Authentication authentication)
        throws IOException,servletexception {

    Map<String,Object> result = new HashMap<>();
    result.put("success",true);

    MongoUserDetails userDetails = (MongoUserDetails) authentication.getPrincipal();
    if (userDetails != null) {
        User user;
        if (!userDetails.isPreAuth()) {

            user = this.mongoDb.getCollection(User.class).findOneAndUpdate(
                    Filters.eq(CUser.id,userDetails.getUserDbId()),Updates.set(CUser.lastAccess,new Date()),new FindOneAndUpdateOptions()
                            .returnDocument(ReturnDocument.AFTER));
        }
        else {
            user = this.mongoDb.getCollection(User.class)
                    .find(Filters.eq(CUser.id,userDetails.getUserDbId())).first();
        }
        result.put(SecurityService.AUTH_USER,new UserDetailDto(userDetails,user,CsrfController.getCsrftoken(request)));
    }
    response.setCharacterEncoding("UTF-8");
    response.getWriter().print(this.objectMapper.writeValueAsstring(result));
    response.getWriter().flush();
}

/**
 * Configures this modifier so that new (updated) version of document will be returned in
 * case of successful update.
 * @see #returningOld()
 * @return {@code this} modifier for chained invocation
 */
// safe unchecked: we expect I to be a self type
@SuppressWarnings("unchecked")
public final M returningNew() {
  options.returnDocument(ReturnDocument.AFTER);
  return (M) this;
}

public SyncUserSession saveSession(SyncUserSession userSession) {
    return userSessionCollection.findOneAndReplace(
            Filters.eq(String.valueOf(SessionAttributes._id),userSession.getSessionId()),userSession,new FindOneAndReplaceOptions().returnDocument(ReturnDocument.AFTER).upsert(true));
}

public void setEncryptedPassword(ObjectId id,byte[] pass) {
     connectionInfo.findOneAndUpdate(
            Filters.and(Filters.eq(String.valueOf(ConnectionInfoAttributes._id),id)),Updates.set(String.valueOf(ConnectionInfoAttributes.password),pass),new FindOneAndUpdateOptions().returnDocument(ReturnDocument.AFTER));
}

public SyncNode updateNodeDetails(SyncNode nodeMapper) {
    return syncNodeMapping.findOneAndReplace(Filters.eq(SyncAttrs.ID,nodeMapper.getId()),nodeMapper,new FindOneAndReplaceOptions().returnDocument(ReturnDocument.AFTER).upsert(true));
}

public SyncNode getNodeDetails(SyncNode nodeMapper) {
    Bson filter = Filters.eq(SyncAttrs.UUID,nodeMapper.getUUID());
    logger.info("Getting node with filter " + filter);
    return syncNodeMapping.findOneAndUpdate(filter,Updates.unset(SyncAttrs.FAILURE_TIME),new FindOneAndUpdateOptions().returnDocument(ReturnDocument.AFTER));
}

public SyncUser updateUser(SyncUser user) {
    return userDetailsCollection.findOneAndReplace(
            Filters.eq(String.valueOf(UserDetailAttributes._id),user.getUserid()),new FindOneAndReplaceOptions().returnDocument(ReturnDocument.AFTER)
                                                  .upsert(true));
}

public void saveFlow(FlowEntity flowEntity) {

    if (flowEntity.getId() == null) {
      Integer nextId;
      Document lastFlow = collection.find()
          .projection(new Document("flow_id",1))
          .sort(new Document("flow_id",-1))
          .limit(1)
          .first();
      if (lastFlow == null) {
        nextId = 1;
      } else {
        nextId = lastFlow.getInteger("flow_id") + 1;
      }

      flowEntity.setId(nextId);
    }

    Document filter = new Document()
        .append("flow_id",flowEntity.getId());

    List<Document> conditionList = flowEntity.getConditionList()
        .stream()
        .map(conditionEntity ->
            new Document()
                .append("dev_id",conditionEntity.getDevId())
                .append("dev_type",conditionEntity.getDevType())
                .append("type",conditionEntity.getType())
                .append("parameter",conditionEntity.getParameter()))
        .collect(Collectors.toList());

    List<Document> actionList = flowEntity.getActionList()
        .stream()
        .map(conditionEntity ->
            new Document()
                .append("dev_id",conditionEntity.getParameter()))
        .collect(Collectors.toList());

    Document entityDocument = new Document()
        .append("$set",new Document()
            .append("flow_id",flowEntity.getId())
            .append("name",flowEntity.getName())
            .append("order_num",flowEntity.getorderNum())
            .append("conditions",conditionList)
            .append("actions",actionList)
        );

    FindOneAndUpdateOptions options = new FindOneAndUpdateOptions()
        .returnDocument(ReturnDocument.AFTER)
        .upsert(true);

    collection.findOneAndUpdate(filter,entityDocument,options);
  }

public SmofOpOptionsImpl() {
    upsert = false;
    validateDocuments = true;
    ret = ReturnDocument.AFTER;
    bypassCache = false;
}

@Override
   public void setReturnDocument(ReturnDocument doc) {
    this.ret = doc;
}

private void updateLockedProperties(AuthenticationFailureBadCredentialsEvent event) {
    Object principal = event.getAuthentication().getPrincipal();

    if (this.loginLockAttempts != null && (principal instanceof String
            || principal instanceof MongoUserDetails)) {

        User user = null;
        if (principal instanceof String) {
            user = this.mongoDb.getCollection(User.class).findOneAndUpdate(
                    Filters.and(Filters.eq(CUser.loginName,principal),Updates.inc(CUser.FailedLogins,1),new FindOneAndUpdateOptions()
                            .returnDocument(ReturnDocument.AFTER).upsert(false));
        }
        else {
            user = this.mongoDb.getCollection(User.class).findOneAndUpdate(
                    Filters.eq(CUser.id,((MongoUserDetails) principal).getUserDbId()),new FindOneAndUpdateOptions()
                            .returnDocument(ReturnDocument.AFTER).upsert(false));
        }

        if (user != null) {
            if (user.getFailedLogins() >= this.loginLockAttempts) {
                if (this.loginLockMinutes != null) {
                    this.mongoDb.getCollection(User.class).updateOne(
                            Filters.eq(CUser.id,user.getId()),Updates.set(CUser.lockedOutUntil,Date.from(zoneddatetime.Now(ZoneOffset.UTC)
                                            .plusMinutes(this.loginLockMinutes)
                                            .toInstant())));
                }
                else {
                    this.mongoDb.getCollection(User.class)
                            .updateOne(Filters.eq(CUser.id,Date.from(zoneddatetime
                                                    .Now(ZoneOffset.UTC)
                                                    .plusYears(1000).toInstant())));
                }
            }
        }
        else {
            Application.logger.warn("UnkNown user login attempt: {}",principal);
        }
    }
    else {
        Application.logger.warn("Invalid login attempt: {}",principal);
    }
}