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 org.apache.beam.model.pipeline.v1.RunnerApi;
  import org.apache.beam.runners.samza.runtime.OpAdapter;
  import org.apache.beam.runners.samza.runtime.OpMessage;
  import org.apache.beam.runners.samza.runtime.WindowAssignOp;
  import org.apache.beam.sdk.runners.TransformHierarchy;
  import org.apache.beam.sdk.transforms.windowing.Window;
  import org.apache.beam.sdk.transforms.windowing.WindowFn;
  import org.apache.beam.sdk.util.construction.WindowingStrategyTranslation;
  import org.apache.beam.sdk.util.construction.graph.PipelineNode;
  import org.apache.beam.sdk.util.construction.graph.QueryablePipeline;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.vendor.grpc.v1p69p0.com.google.protobuf.InvalidProtocolBufferException;
  import org.apache.samza.operators.MessageStream;
  
  /**
   * Translates {@link org.apache.beam.sdk.transforms.windowing.Window.Assign} to Samza {@link
   * WindowAssignOp}.
   */
  class WindowAssignTranslator<T> implements TransformTranslator<Window.Assign<T>> {
    @Override
    public void translate(
        Window.Assign<T> transform, TransformHierarchy.Node node, TranslationContext ctx) {
      final PCollection<T> output = ctx.getOutput(transform);
  
      @SuppressWarnings("unchecked")
      final WindowFn<T, ?> windowFn = (WindowFn<T, ?>) output.getWindowingStrategy().getWindowFn();
  
      final MessageStream<OpMessage<T>> inputStream = ctx.getMessageStream(ctx.getInput(transform));
  
      final MessageStream<OpMessage<T>> outputStream =
          inputStream.flatMapAsync(OpAdapter.adapt(new WindowAssignOp<>(windowFn), ctx));
  
      ctx.registerMessageStream(output, outputStream);
    }
  
    @Override
    public void translatePortable(
        PipelineNode.PTransformNode transform,
        QueryablePipeline pipeline,
        PortableTranslationContext ctx) {
      final RunnerApi.WindowIntoPayload payload;
      try {
        payload =
            RunnerApi.WindowIntoPayload.parseFrom(transform.getTransform().getSpec().getPayload());
      } catch (InvalidProtocolBufferException e) {
        throw new IllegalArgumentException(
            String.format("failed to parse WindowIntoPayload: %s", transform.getId()), e);
      }
  
      @SuppressWarnings("unchecked")
      final WindowFn<T, ?> windowFn =
          (WindowFn<T, ?>) WindowingStrategyTranslation.windowFnFromProto(payload.getWindowFn());
  
      final MessageStream<OpMessage<T>> inputStream = ctx.getOneInputMessageStream(transform);
  
      final MessageStream<OpMessage<T>> outputStream =
          inputStream.flatMapAsync(OpAdapter.adapt(new WindowAssignOp<>(windowFn), ctx));
  
      ctx.registerMessageStream(ctx.getOutputId(transform), outputStream);
    }
  }
  