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 backtype.storm.state;
  
  import java.util.Map;
  
  import backtype.storm.task.TopologyContext;
  
  /**
   * Used by the {@link StateFactory} to create a new state instances.
   */
  public interface StateProvider {
      /**
       * Returns a new state instance. Each state belongs unique namespace which is typically
       * the componentid-task of the task, so that each task can have its own unique state.
       *
       * @param namespace a namespace of the state
       * @param stormConf the storm topology configuration
       * @param context   the {@link TopologyContext}
       * @return a previously saved state if one exists otherwise a newly initialized state.
       */
      State newState(String namespace, Map stormConf, TopologyContext context);
  }
  