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.common.utils.Bytes;
  import org.apache.kafka.streams.kstream.Windowed;
  import org.apache.kafka.streams.processor.StateStore;
  import org.apache.kafka.streams.processor.StateStoreContext;
  import org.apache.kafka.streams.query.PositionBound;
  import org.apache.kafka.streams.query.Query;
  import org.apache.kafka.streams.query.QueryConfig;
  import org.apache.kafka.streams.query.QueryResult;
  import org.apache.kafka.streams.state.KeyValueIterator;
  import org.apache.kafka.streams.state.WindowStore;
  import org.apache.kafka.streams.state.WindowStoreIterator;
  
  public class RocksDBWindowStore
      extends WrappedStateStore<SegmentedBytesStore, Object, Object>
      implements WindowStore<Bytes, byte[]> {
  
      private final boolean retainDuplicates;
      private final long windowSize;
  
      private int seqnum = 0;
  
      private StateStoreContext stateStoreContext;
  
      RocksDBWindowStore(final SegmentedBytesStore bytesStore,
                         final boolean retainDuplicates,
                         final long windowSize) {
          super(bytesStore);
          this.retainDuplicates = retainDuplicates;
          this.windowSize = windowSize;
      }
  
      @Override
      public void init(final StateStoreContext stateStoreContext, final StateStore root) {
          wrapped().init(stateStoreContext, root);
          this.stateStoreContext = stateStoreContext;
      }
  
      @Override
      public void put(final Bytes key, final byte[] value, final long windowStartTimestamp) {
          // Skip if value is null and duplicates are allowed since this delete is a no-op
          if (!(value == null && retainDuplicates)) {
              maybeUpdateSeqnumForDups();
              wrapped().put(WindowKeySchema.toStoreKeyBinary(key, windowStartTimestamp, seqnum), value);
          }
      }
  
      @Override
      public byte[] fetch(final Bytes key, final long timestamp) {
          return wrapped().get(WindowKeySchema.toStoreKeyBinary(key, timestamp, seqnum));
      }
  
      @Override
      public WindowStoreIterator<byte[]> fetch(final Bytes key, final long timeFrom, final long timeTo) {
          final KeyValueIterator<Bytes, byte[]> bytesIterator = wrapped().fetch(key, timeFrom, timeTo);
          return new WindowStoreIteratorWrapper(bytesIterator, windowSize).valuesIterator();
      }
  
      @Override
      public WindowStoreIterator<byte[]> backwardFetch(final Bytes key, final long timeFrom, final long timeTo) {
          final KeyValueIterator<Bytes, byte[]> bytesIterator = wrapped().backwardFetch(key, timeFrom, timeTo);
          return new WindowStoreIteratorWrapper(bytesIterator, windowSize).valuesIterator();
      }
  
      @Override
      public KeyValueIterator<Windowed<Bytes>, byte[]> fetch(final Bytes keyFrom,
                                                             final Bytes keyTo,
                                                             final long timeFrom,
                                                             final long timeTo) {
          final KeyValueIterator<Bytes, byte[]> bytesIterator = wrapped().fetch(keyFrom, keyTo, timeFrom, timeTo);
          return new WindowStoreIteratorWrapper(bytesIterator, windowSize).keyValueIterator();
      }
  
      @Override
      public KeyValueIterator<Windowed<Bytes>, byte[]> backwardFetch(final Bytes keyFrom,
                                                                     final Bytes keyTo,
                                                                     final long timeFrom,
                                                                     final long timeTo) {
          final KeyValueIterator<Bytes, byte[]> bytesIterator = wrapped().backwardFetch(keyFrom, keyTo, timeFrom, timeTo);
          return new WindowStoreIteratorWrapper(bytesIterator, windowSize).keyValueIterator();
      }
  
      @Override
      public KeyValueIterator<Windowed<Bytes>, byte[]> all() {
          final KeyValueIterator<Bytes, byte[]> bytesIterator = wrapped().all();
          return new WindowStoreIteratorWrapper(bytesIterator, windowSize).keyValueIterator();
      }
  
      @Override
      public KeyValueIterator<Windowed<Bytes>, byte[]> backwardAll() {
          final KeyValueIterator<Bytes, byte[]> bytesIterator = wrapped().backwardAll();
          return new WindowStoreIteratorWrapper(bytesIterator, windowSize).keyValueIterator();
      }
  
      @Override
      public KeyValueIterator<Windowed<Bytes>, byte[]> fetchAll(final long timeFrom, final long timeTo) {
          final KeyValueIterator<Bytes, byte[]> bytesIterator = wrapped().fetchAll(timeFrom, timeTo);
          return new WindowStoreIteratorWrapper(bytesIterator, windowSize).keyValueIterator();
      }
  
      @Override
      public KeyValueIterator<Windowed<Bytes>, byte[]> backwardFetchAll(final long timeFrom, final long timeTo) {
          final KeyValueIterator<Bytes, byte[]> bytesIterator = wrapped().backwardFetchAll(timeFrom, timeTo);
          return new WindowStoreIteratorWrapper(bytesIterator, windowSize).keyValueIterator();
      }
  
      @Override
      public <R> QueryResult<R> query(final Query<R> query,
                                      final PositionBound positionBound,
                                      final QueryConfig config) {
  
          return StoreQueryUtils.handleBasicQueries(
              query,
              positionBound,
              config,
              this,
              getPosition(),
              stateStoreContext
          );
      }
  
      private void maybeUpdateSeqnumForDups() {
          if (retainDuplicates) {
              seqnum = (seqnum + 1) & 0x7FFFFFFF;
          }
      }
  }
  