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;
  
  import static com.google.api.client.util.Base64.decodeBase64;
  import static org.apache.beam.runners.dataflow.util.Structs.getString;
  import static org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions.checkArgument;
  
  import com.google.auto.service.AutoService;
  import java.util.Map;
  import org.apache.beam.runners.dataflow.util.CloudObject;
  import org.apache.beam.runners.dataflow.worker.util.WorkerPropertyNames;
  import org.apache.beam.runners.dataflow.worker.util.common.worker.NativeReader;
  import org.apache.beam.sdk.coders.Coder;
  import org.apache.beam.sdk.options.PipelineOptions;
  import org.apache.beam.sdk.values.KV;
  import org.apache.beam.sdk.values.WindowedValue;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableMap;
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  /** Creates a PartitioningShuffleReader from a CloudObject spec. */
  @SuppressWarnings({
    "rawtypes", // TODO(https://github.com/apache/beam/issues/20447)
    "nullness" // TODO(https://github.com/apache/beam/issues/20497)
  })
  public class PartitioningShuffleReaderFactory implements ReaderFactory {
  
    /** A {@link ReaderFactory.Registrar} for partitioning shuffle sources. */
    @AutoService(ReaderFactory.Registrar.class)
    public static class Registrar implements ReaderFactory.Registrar {
  
      @Override
      public Map<String, ReaderFactory> factories() {
        return ImmutableMap.of("PartitioningShuffleSource", new PartitioningShuffleReaderFactory());
      }
    }
  
    @Override
    public NativeReader<?> create(
        CloudObject spec,
        @Nullable Coder<?> coder,
        @Nullable PipelineOptions options,
        @Nullable DataflowExecutionContext executionContext,
        DataflowOperationContext operationContext)
        throws Exception {
      checkArgument(
          options != null, "PipelineOptions must not be null in PartitioningShuffleReaderFactory");
      @SuppressWarnings({"unchecked", "rawtypes"})
      Coder<WindowedValue<KV<Object, Object>>> typedCoder =
          (Coder<WindowedValue<KV<Object, Object>>>) coder;
      return createTyped(spec, options, typedCoder, executionContext, operationContext);
    }
  
    public <K, V> PartitioningShuffleReader<K, V> createTyped(
        CloudObject spec,
        PipelineOptions options,
        Coder<WindowedValue<KV<K, V>>> coder,
        @Nullable DataflowExecutionContext executionContext,
        DataflowOperationContext operationContext)
        throws Exception {
      return new PartitioningShuffleReader<K, V>(
          options,
          decodeBase64(getString(spec, WorkerPropertyNames.SHUFFLE_READER_CONFIG)),
          getString(spec, WorkerPropertyNames.START_SHUFFLE_POSITION, null),
          getString(spec, WorkerPropertyNames.END_SHUFFLE_POSITION, null),
          coder,
          (BatchModeExecutionContext) executionContext,
          operationContext);
    }
  }
  