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.kafka.streams.state.internals;
  
  import org.apache.kafka.streams.processor.StateStore;
  import org.apache.kafka.streams.state.QueryableStoreType;
  import org.apache.kafka.streams.state.QueryableStoreTypes;
  
  import java.util.List;
  
  /**
   * Provides access to {@link StateStore}s that have been created
   * as part of the {@link org.apache.kafka.streams.processor.internals.ProcessorTopology}.
   * To get access to custom stores developers should implement {@link QueryableStoreType}.
   * @see QueryableStoreTypes
   */
  public interface StateStoreProvider {
  
      /**
       * Find instances of StateStore that are accepted by {@link QueryableStoreType#accepts} and
       * have the provided storeName.
       *
       * @param storeName             name of the store
       * @param queryableStoreType    filter stores based on this queryableStoreType
       * @param <T>                   The type of the Store
       * @return  List of the instances of the store in this topology. Empty List if not found
       */
      <T> List<T> stores(String storeName, QueryableStoreType<T> queryableStoreType);
  }
  