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.kstream.Windowed;
  
  /**
   * Interface for storing the aggregated values of fixed-size time windows.
   * <p>
   * Note, that the stores's physical key type is {@link Windowed Windowed&lt;K&gt;}.
   * In contrast to a {@link WindowStore} that stores plain windowedKeys-value pairs,
   * a {@code TimestampedWindowStore} stores windowedKeys-(value/timestamp) pairs.
   * <p>
   * While the window start- and end-timestamp are fixed per window, the value-side timestamp is used
   * to store the last update timestamp of the corresponding window.
   *
   * @param <K> Type of keys
   * @param <V> Type of values
   */
  public interface TimestampedWindowStore<K, V> extends WindowStore<K, ValueAndTimestamp<V>> { }