content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * 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 com.alibaba.nacos.core.distributed.distro.component;
  
  import com.alibaba.nacos.core.distributed.distro.entity.DistroData;
  import com.alibaba.nacos.core.distributed.distro.entity.DistroKey;
  
  import java.util.List;
  
  /**
   * Distro data storage.
   *
   * @author xiweng.yy
   */
  public interface DistroDataStorage {
      
      /**
       * Set this distro data storage has finished initial step.
       */
      void finishInitial();
      
      /**
       * Whether this distro data is finished initial.
       *
       * <p>If not finished, this data storage should not send verify data to other node.
       *
       * @return {@code true} if finished, otherwise false
       */
      boolean isFinishInitial();
      
      /**
       * Get distro datum.
       *
       * @param distroKey key of distro datum
       * @return need to sync datum
       */
      DistroData getDistroData(DistroKey distroKey);
      
      /**
       * Get all distro datum snapshot.
       *
       * @return all datum
       */
      DistroData getDatumSnapshot();
      
      /**
       * Get verify datum.
       *
       * @return verify datum
       */
      List<DistroData> getVerifyData();
  }
  