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.query;
  
  /**
   * Marker interface that all interactive queries must implement (see {@link
   * org.apache.kafka.streams.KafkaStreams#query(StateQueryRequest)}).
   * <p>
   * You can find all available queries by searching for classes implementing this interface.
   * <p>
   * Kafka Streams will pass unknown query types straight through into the bytes stores, so callers
   * can add custom queries by implementing this interface and providing custom stores that handle
   * them (via {@link org.apache.kafka.streams.state.StoreSupplier}s.
   * <p>
   * See KIP-796 (https://cwiki.apache.org/confluence/x/34xnCw) for more details.
   *
   * @param <R> The type of the result returned by this query.
   */
  public interface Query<R> {
  
  }
  