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 org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions.checkArgument;
  import static org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions.checkState;
  
  import com.google.api.services.dataflow.model.SideInputInfo;
  import java.util.List;
  import java.util.Map;
  import org.apache.beam.runners.dataflow.util.CloudObject;
  import org.apache.beam.runners.dataflow.util.CloudObjects;
  import org.apache.beam.runners.dataflow.util.PropertyNames;
  import org.apache.beam.runners.dataflow.util.Structs;
  import org.apache.beam.runners.dataflow.worker.DataflowExecutionContext.DataflowStepContext;
  import org.apache.beam.runners.dataflow.worker.util.WorkerPropertyNames;
  import org.apache.beam.runners.dataflow.worker.util.common.worker.ParDoFn;
  import org.apache.beam.sdk.coders.Coder;
  import org.apache.beam.sdk.options.PipelineOptions;
  import org.apache.beam.sdk.values.TupleTag;
  import org.apache.beam.sdk.values.WindowedValues.FullWindowedValueCoder;
  
  /**
   * A {@link ParDoFnFactory} which constructs {@link StreamingPCollectionViewWriterParDoFn}s used to
   * write side input data.
   *
   * <p>Note that this {@link ParDoFnFactory} may only be used in a streaming context.
   */
  public class StreamingPCollectionViewWriterDoFnFactory implements ParDoFnFactory {
  
    @Override
    public ParDoFn create(
        PipelineOptions options,
        CloudObject cloudUserFn,
        List<SideInputInfo> sideInputInfos,
        TupleTag<?> mainOutputTag,
        Map<TupleTag<?>, Integer> outputTupleTagsToReceiverIndices,
        DataflowExecutionContext<?> executionContext,
        DataflowOperationContext operationContext)
        throws Exception {
      DataflowStepContext stepContext = executionContext.getStepContext(operationContext);
      checkArgument(
          stepContext instanceof StreamingModeExecutionContext.StreamingModeStepContext,
          "stepContext must be a StreamingModeStepContext to use StreamingPCollectionViewWriterFn");
  
      Coder<?> coder =
          CloudObjects.coderFromCloudObject(
              CloudObject.fromSpec(Structs.getObject(cloudUserFn, PropertyNames.ENCODING)));
      checkState(
          coder instanceof FullWindowedValueCoder,
          "Expected to received an instanceof an %s but got %s",
          FullWindowedValueCoder.class.getSimpleName(),
          coder);
      FullWindowedValueCoder<?> windowedValueCoder = (FullWindowedValueCoder<?>) coder;
      return new StreamingPCollectionViewWriterParDoFn(
          (StreamingModeExecutionContext.StreamingModeStepContext) stepContext,
          new TupleTag<>(Structs.getString(cloudUserFn, WorkerPropertyNames.SIDE_INPUT_ID)),
          (Coder) windowedValueCoder.getValueCoder(),
          (Coder) windowedValueCoder.getWindowCoder());
    }
  }
  