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.beam.runners.dataflow.worker.windmill.state;
  
  import java.io.Closeable;
  import java.io.IOException;
  import java.util.Optional;
  import org.apache.beam.runners.dataflow.worker.windmill.Windmill;
  import org.apache.beam.sdk.state.ReadableState;
  import org.apache.beam.sdk.state.SetState;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Supplier;
  import org.checkerframework.checker.initialization.qual.Initialized;
  import org.checkerframework.checker.nullness.qual.NonNull;
  import org.checkerframework.checker.nullness.qual.UnknownKeyFor;
  
  public class WindmillSet<K> extends SimpleWindmillState implements SetState<K> {
    private final AbstractWindmillMap<K, Boolean> windmillMap;
  
    WindmillSet(AbstractWindmillMap<K, Boolean> windmillMap) {
      this.windmillMap = windmillMap;
    }
  
    @Override
    protected Windmill.WorkItemCommitRequest persistDirectly(WindmillStateCache.ForKeyAndFamily cache)
        throws IOException {
      return windmillMap.persistDirectly(cache);
    }
  
    @Override
    public @UnknownKeyFor @NonNull @Initialized ReadableState<
            @UnknownKeyFor @NonNull @Initialized Boolean>
        contains(K k) {
      return windmillMap.getOrDefault(k, false);
    }
  
    @Override
    public @UnknownKeyFor @NonNull @Initialized ReadableState<
            @UnknownKeyFor @NonNull @Initialized Boolean>
        addIfAbsent(K k) {
      return new WindmillSetAddIfAbsentReadableState(k);
    }
  
    @Override
    public void remove(K k) {
      windmillMap.remove(k);
    }
  
    @Override
    public void add(K value) {
      windmillMap.put(value, true);
    }
  
    @Override
    public @UnknownKeyFor @NonNull @Initialized ReadableState<
            @UnknownKeyFor @NonNull @Initialized Boolean>
        isEmpty() {
      return windmillMap.isEmpty();
    }
  
    @Override
    public Iterable<K> read() {
      return windmillMap.keys().read();
    }
  
    @Override
    public @UnknownKeyFor @NonNull @Initialized SetState<K> readLater() {
      windmillMap.keys().readLater();
      return this;
    }
  
    @Override
    public void clear() {
      windmillMap.clear();
    }
  
    @Override
    void initializeForWorkItem(
        WindmillStateReader reader, Supplier<Closeable> scopedReadStateSupplier) {
      super.initializeForWorkItem(reader, scopedReadStateSupplier);
      windmillMap.initializeForWorkItem(reader, scopedReadStateSupplier);
    }
  
    @Override
    void cleanupAfterWorkItem() {
      super.cleanupAfterWorkItem();
      windmillMap.cleanupAfterWorkItem();
    }
  
    private class WindmillSetAddIfAbsentReadableState implements ReadableState<Boolean> {
      ReadableState<Boolean> putState;
  
      public WindmillSetAddIfAbsentReadableState(K k) {
        putState = windmillMap.putIfAbsent(k, true);
      }
  
      @Override
      public Boolean read() {
        return Optional.ofNullable(putState.read()).orElse(false);
      }
  
      @Override
      public @UnknownKeyFor @NonNull @Initialized ReadableState<Boolean> readLater() {
        putState = putState.readLater();
        return this;
      }
    }
  }
  