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.sdk.fn.data;
  
  import static org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions.checkArgument;
  
  import com.google.auto.value.AutoValue;
  import org.apache.beam.model.fnexecution.v1.BeamFnApi.RemoteGrpcPort;
  import org.apache.beam.model.pipeline.v1.RunnerApi.FunctionSpec;
  import org.apache.beam.model.pipeline.v1.RunnerApi.PTransform;
  import org.apache.beam.vendor.grpc.v1p69p0.com.google.protobuf.InvalidProtocolBufferException;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Iterables;
  
  /**
   * An execution-time only {@link PTransform} which represents an SDK harness reading from a {@link
   * RemoteGrpcPort}.
   */
  @AutoValue
  public abstract class RemoteGrpcPortRead {
    public static final String URN = "beam:runner:source:v1";
    private static final String LOCAL_OUTPUT_ID = "local_output";
  
    public static RemoteGrpcPortRead readFromPort(RemoteGrpcPort port, String outputPCollectionId) {
      return new AutoValue_RemoteGrpcPortRead(port, outputPCollectionId);
    }
  
    public static RemoteGrpcPortRead fromPTransform(PTransform pTransform)
        throws InvalidProtocolBufferException {
      checkArgument(
          URN.equals(pTransform.getSpec().getUrn()),
          "Expected URN for %s, got %s",
          RemoteGrpcPortRead.class.getSimpleName(),
          pTransform.getSpec().getUrn());
      checkArgument(
          pTransform.getOutputsCount() == 1,
          "Expected exactly one output, got %s",
          pTransform.getOutputsCount());
      RemoteGrpcPort port = RemoteGrpcPort.parseFrom(pTransform.getSpec().getPayload());
      String outputPcollection = Iterables.getOnlyElement(pTransform.getOutputsMap().values());
      return readFromPort(port, outputPcollection);
    }
  
    public PTransform toPTransform() {
      return PTransform.newBuilder()
          .setSpec(FunctionSpec.newBuilder().setUrn(URN).setPayload(getPort().toByteString()).build())
          .putOutputs(LOCAL_OUTPUT_ID, getOutputPCollectionId())
          .build();
    }
  
    public abstract RemoteGrpcPort getPort();
  
    abstract String getOutputPCollectionId();
  }
  