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.runners;
  
  import static org.apache.beam.sdk.metrics.MetricResultsMatchers.metricsResult;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.hasItem;
  import static org.junit.Assert.assertTrue;
  
  import org.apache.beam.sdk.PipelineResult;
  import org.apache.beam.sdk.PipelineRunner;
  import org.apache.beam.sdk.metrics.Counter;
  import org.apache.beam.sdk.metrics.MetricNameFilter;
  import org.apache.beam.sdk.metrics.Metrics;
  import org.apache.beam.sdk.metrics.MetricsFilter;
  import org.apache.beam.sdk.options.PipelineOptions;
  import org.apache.beam.sdk.options.PipelineOptionsFactory;
  import org.apache.beam.sdk.testing.CrashingRunner;
  import org.apache.beam.sdk.testing.NeedsRunner;
  import org.apache.beam.sdk.testing.PAssert;
  import org.apache.beam.sdk.testing.TestPipeline;
  import org.apache.beam.sdk.testing.UsesCommittedMetrics;
  import org.apache.beam.sdk.testing.UsesCounterMetrics;
  import org.apache.beam.sdk.transforms.Create;
  import org.apache.beam.sdk.transforms.MapElements;
  import org.apache.beam.sdk.transforms.PTransform;
  import org.apache.beam.sdk.transforms.SimpleFunction;
  import org.apache.beam.sdk.values.PBegin;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.POutput;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link PipelineRunner}. */
  @RunWith(JUnit4.class)
  public class PipelineRunnerTest {
  
    @Rule public final transient TestPipeline p = TestPipeline.create();
  
    @Test
    public void testInstantiation() {
      PipelineOptions options = PipelineOptionsFactory.create();
      options.setRunner(CrashingRunner.class);
      PipelineRunner<?> runner = PipelineRunner.fromOptions(options);
      assertTrue(runner instanceof CrashingRunner);
    }
  
    private static class ScaleFn<T extends Number> extends SimpleFunction<T, Double> {
  
      private final double scalar;
      private final Counter counter;
  
      public ScaleFn(double scalar, Counter counter) {
        this.scalar = scalar;
        this.counter = counter;
      }
  
      @Override
      public Double apply(T input) {
        counter.inc();
        return scalar * input.doubleValue();
      }
    }
  
    @Test
    @Category({NeedsRunner.class, UsesCommittedMetrics.class, UsesCounterMetrics.class})
    public void testRunPTransform() {
      final String namespace = PipelineRunnerTest.class.getName();
      final Counter counter = Metrics.counter(namespace, "count");
      final PipelineResult result =
          PipelineRunner.fromOptions(p.getOptions())
              .run(
                  new PTransform<PBegin, POutput>() {
                    @Override
                    public POutput expand(PBegin input) {
                      PCollection<Double> output =
                          input
                              .apply(Create.of(1, 2, 3, 4))
                              .apply("ScaleByTwo", MapElements.via(new ScaleFn<>(2.0, counter)));
                      PAssert.that(output).containsInAnyOrder(2.0, 4.0, 6.0, 8.0);
                      return output;
                    }
                  });
  
      // Checking counters to verify the pipeline actually ran.
      assertThat(
          result
              .metrics()
              .queryMetrics(
                  MetricsFilter.builder()
                      .addNameFilter(MetricNameFilter.inNamespace(namespace))
                      .build())
              .getCounters(),
          hasItem(metricsResult(namespace, "count", "ScaleByTwo", 4L, true)));
    }
  }
  