runners/core-construction-java/src/test/java/org/apache/beam/runners/core/construction/expansion/TestExpansionService.java

/*
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 * 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,
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 * See the License for the specific language governing permissions and
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package org.apache.beam.runners.core.construction.expansion;

import com.google.auto.service.AutoService;
import java.util.Map;
import org.apache.beam.sdk.transforms.Count;
import org.apache.beam.sdk.transforms.Filter;
import org.apache.beam.vendor.grpc.v1p13p1.io.grpc.Server;
import org.apache.beam.vendor.grpc.v1p13p1.io.grpc.ServerBuilder;
import org.apache.beam.vendor.guava.v20_0.com.google.common.collect.ImmutableMap;

/**
 * An {@link org.apache.beam.runners.core.construction.expansion.ExpansionService} useful for tests.
 */
public class TestExpansionService {

  private static final String TEST_COUNT_URN = "pytest:beam:transforms:count";
  private static final String TEST_FILTER_URN = "pytest:beam:transforms:filter_less_than";

  /** Registers a single test transformation. */
  @AutoService(ExpansionService.ExpansionServiceRegistrar.class)
  public static class TestTransforms implements ExpansionService.ExpansionServiceRegistrar {
    @Override
    public Map<String, ExpansionService.TransformProvider> knownTransforms() {
      return ImmutableMap.of(
          TEST_COUNT_URN, spec -> Count.perElement(),
          TEST_FILTER_URN,
              spec ->
                  Filter.lessThanEq(
                      // TODO(BEAM-6587): Use strings directly rather than longs.
                      (long) spec.getPayload().toStringUtf8().charAt(0)));
    }
  }

  public static void main(String[] args) throws Exception {
    int port = Integer.parseInt(args[0]);
    System.out.println("Starting expansion service at localhost:" + port);
    Server server = ServerBuilder.forPort(port).addService(new ExpansionService()).build();
    server.start();
    server.awaitTermination();
  }
}