content: /**
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.jstorm.transactional.state;
  
  public interface ICheckpoint<T> {
      /**
       * restore state by the specified checkpoint
       * @param checkpoint
       */
      public void restore(T checkpoint);
  
      /**
       * backup state for a batch
       * @param batchId
       * @return
       */
      public T backup(long batchId);
  
      /**
       * checkpoint for a batch
       * @param batchId
       */
      public void checkpoint(long batchId);
  
      /**
       * remove the backup file both in local or remote storage for a successful batch
       * @param batchId successful batch id
       */
      public void remove(long batchId);
  }