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.common.utils.Bytes;
  
  /**
   * A store supplier that can be used to create one or more {@link WindowStore WindowStore&lt;Byte, byte[]&gt;} instances of type &lt;Byte, byte[]&gt;.
   *
   * For any stores implementing the {@link WindowStore WindowStore&lt;Byte, byte[]&gt;} interface, null value bytes are considered as "not exist". This means:
   *
   * 1. Null value bytes in put operations should be treated as delete.
   * 2. Null value bytes should never be returned in range query results.
   */
  public interface WindowBytesStoreSupplier extends StoreSupplier<WindowStore<Bytes, byte[]>> {
  
      /**
       * The size of the segments (in milliseconds) the store has.
       * If your store is segmented then this should be the size of segments in the underlying store.
       * It is also used to reduce the amount of data that is scanned when caching is enabled.
       *
       * @return size of the segments (in milliseconds)
       */
      long segmentIntervalMs();
  
      /**
       * The size of the windows (in milliseconds) any store created from this supplier is creating.
       *
       * @return window size
       */
      long windowSize();
  
      /**
       * Whether or not this store is retaining duplicate keys.
       * Usually only true if the store is being used for joins.
       * Note this should return false if caching is enabled.
       *
       * @return true if duplicates should be retained
       */
      boolean retainDuplicates();
  
      /**
       * The time period for which the {@link WindowStore} will retain historic data.
       *
       * @return retentionPeriod
       */
      long retentionPeriod();
  }
  