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   * 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,
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   * See the License for the specific language governing permissions and
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  package org.apache.beam.runners.spark.structuredstreaming.aggregators.metrics.sink;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.is;
  import static org.hamcrest.Matchers.nullValue;
  
  import org.apache.beam.runners.spark.structuredstreaming.SparkSessionRule;
  import org.apache.beam.runners.spark.structuredstreaming.examples.WordCount;
  import org.apache.beam.sdk.coders.StringUtf8Coder;
  import org.apache.beam.sdk.testing.PAssert;
  import org.apache.beam.sdk.testing.TestPipeline;
  import org.apache.beam.sdk.transforms.Create;
  import org.apache.beam.sdk.transforms.MapElements;
  import org.apache.beam.sdk.values.KV;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableList;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableSet;
  import org.junit.ClassRule;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.ExternalResource;
  
  /** A test that verifies Beam metrics are reported to Spark's metrics sink in batch mode. */
  public class SparkMetricsSinkTest {
  
    @ClassRule
    public static final SparkSessionRule SESSION =
        new SparkSessionRule(
            KV.of("spark.metrics.conf.*.sink.memory.class", InMemoryMetrics.class.getName()));
  
    @Rule public final ExternalResource inMemoryMetricsSink = new InMemoryMetricsSinkRule();
  
    @Rule
    public final TestPipeline pipeline = TestPipeline.fromOptions(SESSION.createPipelineOptions());
  
    private static final ImmutableList<String> WORDS =
        ImmutableList.of("hi there", "hi", "hi sue bob", "hi sue", "", "bob hi");
    private static final ImmutableSet<String> EXPECTED_COUNTS =
        ImmutableSet.of("hi: 5", "there: 1", "sue: 2", "bob: 2");
  
    @Test
    public void testInBatchMode() throws Exception {
      assertThat(InMemoryMetrics.valueOf("emptyLines"), is(nullValue()));
  
      final PCollection<String> output =
          pipeline
              .apply(Create.of(WORDS).withCoder(StringUtf8Coder.of()))
              .apply(new WordCount.CountWords())
              .apply(MapElements.via(new WordCount.FormatAsTextFn()));
  
      PAssert.that(output).containsInAnyOrder(EXPECTED_COUNTS);
      pipeline.run();
  
      assertThat(InMemoryMetrics.valueOf("emptyLines"), is(1d));
    }
  }
  