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;
  
  import org.apache.kafka.streams.KafkaStreams;
  import org.apache.kafka.streams.processor.StateStore;
  import org.apache.kafka.streams.state.internals.StateStoreProvider;
  
  /**
   * Used to enable querying of custom {@link StateStore} types via the {@link KafkaStreams} API.
   *
   * @param <T> The store type
   * @see QueryableStoreTypes
   */
  public interface QueryableStoreType<T> {
  
      /**
       * Called when searching for {@link StateStore}s to see if they
       * match the type expected by implementors of this interface.
       *
       * @param stateStore    The stateStore
       * @return true if it is a match
       */
      boolean accepts(final StateStore stateStore);
  
      /**
       * Create an instance of {@code T} (usually a facade) that developers can use
       * to query the underlying {@link StateStore}s.
       *
       * @param storeProvider     provides access to all the underlying StateStore instances
       * @param storeName         The name of the Store
       * @return a read-only interface over a {@code StateStore}
       *        (cf. {@link QueryableStoreTypes.KeyValueStoreType})
       */
      T create(final StateStoreProvider storeProvider,
               final String storeName);
  }