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.spark.util;
  
  import java.util.Objects;
  import java.util.concurrent.TimeUnit;
  import org.apache.beam.sdk.transforms.windowing.BoundedWindow;
  import org.apache.beam.sdk.values.PCollectionView;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.cache.Cache;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.cache.CacheBuilder;
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  /**
   * Cache deserialized side inputs for executor so every task doesn't need to deserialize them again.
   * Side inputs are stored in {@link Cache} with 5 minutes expireAfterAccess.
   */
  @SuppressWarnings({
    "nullness" // TODO(https://github.com/apache/beam/issues/20497)
  })
  class SideInputStorage {
  
    /** JVM deserialized side input cache. */
    private static final Cache<Key<?>, Value<?>> materializedSideInputs =
        CacheBuilder.newBuilder().expireAfterAccess(5, TimeUnit.MINUTES).build();
  
    static Cache<Key<?>, Value<?>> getMaterializedSideInputs() {
      return materializedSideInputs;
    }
  
    /**
     * Composite key of {@link PCollectionView} and {@link BoundedWindow} used to identify
     * materialized results.
     *
     * @param <T> type of result
     */
    public static class Key<T> {
  
      private final PCollectionView<T> view;
      private final BoundedWindow window;
  
      Key(PCollectionView<T> view, BoundedWindow window) {
        this.view = view;
        this.window = window;
      }
  
      @Override
      public boolean equals(@Nullable Object o) {
        if (this == o) {
          return true;
        }
        if (o == null || getClass() != o.getClass()) {
          return false;
        }
        Key<?> key = (Key<?>) o;
        return Objects.equals(view, key.view) && Objects.equals(window, key.window);
      }
  
      @Override
      public int hashCode() {
        return Objects.hash(view, window);
      }
  
      @Override
      public String toString() {
        String pName = view.getPCollection() != null ? view.getPCollection().getName() : "Unknown";
        return "Key{"
            + "view="
            + view.getTagInternal()
            + " of PCollection["
            + pName
            + "], window="
            + window
            + '}';
      }
    }
  
    /**
     * Null value is not allowed in guava's Cache and is valid in SideInput so we use wrapper for
     * cache value.
     */
    public static class Value<T> {
      final T value;
  
      Value(T value) {
        this.value = value;
      }
  
      public T getValue() {
        return value;
      }
    }
  }
  