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.samza.translation;
  
  import com.google.auto.service.AutoService;
  import org.apache.beam.model.pipeline.v1.RunnerApi;
  import org.apache.beam.sdk.runners.TransformHierarchy;
  import org.apache.beam.sdk.transforms.PTransform;
  import org.apache.beam.sdk.util.construction.NativeTransforms;
  import org.apache.beam.sdk.util.construction.graph.PipelineNode;
  import org.apache.beam.sdk.util.construction.graph.QueryablePipeline;
  import org.apache.beam.sdk.values.KV;
  import org.apache.beam.sdk.values.PCollection;
  
  /**
   * Translates Reshuffle transform into Samza's native partitionBy operator, which will partition
   * each incoming message by the key into a Task corresponding to that key.
   */
  public class RedistributeByKeyTranslator<K, V>
      implements TransformTranslator<PTransform<PCollection<KV<K, V>>, PCollection<KV<K, V>>>> {
  
    private final ReshuffleTranslator<K, V, V> reshuffleTranslator =
        new ReshuffleTranslator<>("rdstr-");
  
    @Override
    public void translate(
        PTransform<PCollection<KV<K, V>>, PCollection<KV<K, V>>> transform,
        TransformHierarchy.Node node,
        TranslationContext ctx) {
      reshuffleTranslator.translate(transform, node, ctx);
    }
  
    @Override
    public void translatePortable(
        PipelineNode.PTransformNode transform,
        QueryablePipeline pipeline,
        PortableTranslationContext ctx) {
      reshuffleTranslator.translatePortable(transform, pipeline, ctx);
    }
  
    /** Predicate to determine whether a URN is a Samza native transform. */
    @AutoService(NativeTransforms.IsNativeTransform.class)
    public static class IsSamzaNativeTransform implements NativeTransforms.IsNativeTransform {
      @Override
      public boolean test(RunnerApi.PTransform pTransform) {
        return false;
      }
    }
  }
  