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;
  
  import java.util.Map;
  import org.apache.beam.runners.spark.translation.EvaluationContext;
  import org.apache.beam.runners.spark.translation.SparkPipelineTranslator;
  import org.apache.beam.sdk.runners.TransformHierarchy;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.TupleTag;
  
  /**
   * Traverses the pipeline to populate information on how many {@link
   * org.apache.beam.sdk.transforms.PTransform}s do consume / depends on each {@link PCollection} in
   * the pipeline.
   */
  class DependentTransformsVisitor extends SparkRunner.Evaluator {
  
    DependentTransformsVisitor(
        SparkPipelineTranslator translator, EvaluationContext evaluationContext) {
      super(translator, evaluationContext);
    }
  
    @Override
    public void doVisitTransform(TransformHierarchy.Node node) {
  
      for (Map.Entry<TupleTag<?>, PCollection<?>> entry : node.getInputs().entrySet()) {
        ctxt.reportPCollectionConsumed(entry.getValue());
      }
  
      for (PCollection<?> pOut : node.getOutputs().values()) {
        ctxt.reportPCollectionProduced(pOut);
      }
    }
  }
  