content: /*
   * Copyright [2021-present] [ahoo wang <ahoowang@qq.com> (https://github.com/Ahoo-Wang)].
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *      http://www.apache.org/licenses/LICENSE-2.0
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package me.ahoo.cosid.mongo.reactive;
  
  import static me.ahoo.cosid.mongo.IdSegmentOperates.incrementAndGetUpdates;
  
  import me.ahoo.cosid.mongo.Documents;
  import me.ahoo.cosid.mongo.IdSegmentCollection;
  import me.ahoo.cosid.mongo.IdSegmentOperates;
  
  import com.google.common.base.Preconditions;
  import com.mongodb.client.model.Filters;
  import com.mongodb.reactivestreams.client.MongoCollection;
  import lombok.extern.slf4j.Slf4j;
  import org.bson.Document;
  import org.reactivestreams.Publisher;
  
  import java.util.Objects;
  
  @Slf4j
  public class MongoReactiveIdSegmentCollection implements IdSegmentCollection {
      private final MongoCollection<Document> cosidCollection;
      
      public MongoReactiveIdSegmentCollection(MongoCollection<Document> cosidCollection) {
          this.cosidCollection = cosidCollection;
      }
      
      @Override
      public long incrementAndGet(String namespacedName, long step) {
          Publisher<Document> publisher = cosidCollection.findOneAndUpdate(
              Filters.eq(Documents.ID_FIELD, namespacedName),
              incrementAndGetUpdates(step),
              Documents.UPDATE_UPSERT_AFTER_OPTIONS);
          Document afterDoc = BlockingAdapter.block(publisher);
          
          assert afterDoc != null;
          Preconditions.checkNotNull(afterDoc, "IdSegment[%s] can not be null!", namespacedName);
          Long lastMaxId = afterDoc.getLong(IdSegmentOperates.LAST_MAX_ID_FIELD);
          return Objects.requireNonNull(lastMaxId);
      }
  }
  