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 org.apache.apex.malhar.contrib.kinesis;
  
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * An shard manager interface used by  AbstractPartitionableKinesisInputOperator to define the customized initial positions and periodically update the current shard positions of all the operators
   * Ex. you could write shardManager to hdfs and load it back when restart the application
   *
   * @since 2.0.0
   */
  public class ShardManager
  {
  
    protected final Map<String, String> shardPos = new HashMap<String, String>();
    /**
     * Load initial positions for all kinesis Shards
     * The method is called at the first attempt of creating shards and the return value is used as initial positions for simple consumer
     *
     * @return Map of Kinesis shard id as key and sequence id as value
     */
    public Map<String, String> loadInitialShardPositions()
    {
      return shardPos;
    }
  
    /**
     * @param shardPositions positions for specified shards, it is reported by individual operator instances
     * The method is called every AbstractPartitionableKinesisInputOperator.getRepartitionCheckInterval() to update the current positions
     */
    public void updatePositions(Map<String, String> shardPositions)
    {
      shardPos.putAll(shardPositions);
    }
  }
  