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.flink;
  
  import org.apache.beam.sdk.Pipeline;
  import org.apache.beam.sdk.runners.AppliedPTransform;
  import org.apache.beam.sdk.runners.TransformHierarchy;
  import org.apache.beam.sdk.transforms.PTransform;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.PCollection.IsBounded;
  import org.apache.beam.sdk.values.PValue;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Traverses the Pipeline to determine the translation mode (i.e. streaming or batch) for this
   * pipeline.
   */
  @SuppressWarnings({
    "rawtypes", // TODO(https://github.com/apache/beam/issues/20447)
    "nullness" // TODO(https://github.com/apache/beam/issues/20497)
  })
  class PipelineTranslationModeOptimizer extends FlinkPipelineTranslator {
  
    private static final Logger LOG = LoggerFactory.getLogger(PipelineTranslationModeOptimizer.class);
  
    private boolean hasUnboundedCollections;
  
    static boolean hasUnboundedOutput(Pipeline p) {
      PipelineTranslationModeOptimizer optimizer = new PipelineTranslationModeOptimizer();
      optimizer.translate(p);
      return optimizer.hasUnboundedCollections;
    }
  
    private PipelineTranslationModeOptimizer() {}
  
    @Override
    public void translate(Pipeline pipeline) {
      super.translate(pipeline);
    }
  
    @Override
    public CompositeBehavior enterCompositeTransform(TransformHierarchy.Node node) {
      return CompositeBehavior.ENTER_TRANSFORM;
    }
  
    @Override
    public void leaveCompositeTransform(TransformHierarchy.Node node) {}
  
    @Override
    public void visitPrimitiveTransform(TransformHierarchy.Node node) {
      AppliedPTransform<?, ?, ?> appliedPTransform = node.toAppliedPTransform(getPipeline());
      if (hasUnboundedOutput(appliedPTransform)) {
        Class<? extends PTransform> transformClass = node.getTransform().getClass();
        LOG.debug("Found unbounded PCollection for transform {}", transformClass);
        hasUnboundedCollections = true;
      }
    }
  
    private boolean hasUnboundedOutput(AppliedPTransform<?, ?, ?> transform) {
      return transform.getOutputs().values().stream()
          .filter(value -> value instanceof PCollection)
          .map(value -> (PCollection<?>) value)
          .anyMatch(collection -> collection.isBounded() == IsBounded.UNBOUNDED);
    }
  
    @Override
    public void visitValue(PValue value, TransformHierarchy.Node producer) {}
  }
  