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.
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  package org.apache.beam.runners.dataflow.worker;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.equalTo;
  import static org.hamcrest.Matchers.hasItem;
  import static org.hamcrest.Matchers.hasSize;
  
  import java.util.List;
  import org.apache.beam.runners.dataflow.worker.GroupAlsoByWindowParDoFnFactory.MergingCombineFn;
  import org.apache.beam.sdk.coders.VarLongCoder;
  import org.apache.beam.sdk.testing.TestPipeline;
  import org.apache.beam.sdk.transforms.Combine.BinaryCombineLongFn;
  import org.apache.beam.sdk.transforms.Sum;
  import org.apache.beam.sdk.transforms.windowing.FixedWindows;
  import org.apache.beam.sdk.transforms.windowing.WindowFn;
  import org.apache.beam.sdk.values.WindowingStrategy;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableList;
  import org.joda.time.Duration;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link GroupAlsoByWindowParDoFnFactory}. */
  @RunWith(JUnit4.class)
  @SuppressWarnings({
    "rawtypes" // TODO(https://github.com/apache/beam/issues/20447)
  })
  public class GroupAlsoByWindowParDoFnFactoryTest {
    @Rule public TestPipeline p = TestPipeline.create().enableAbandonedNodeEnforcement(false);
  
    @Test
    public void testJavaWindowingStrategyDeserialization() throws Exception {
      WindowFn windowFn = FixedWindows.of(Duration.millis(17));
  
      WindowingStrategy windowingStrategy = WindowingStrategy.of(windowFn);
  
      assertThat(windowingStrategy.getWindowFn(), equalTo(windowFn));
    }
  
    @Test
    public void testMultipleAccumulatorsInMergingCombineFn() {
      BinaryCombineLongFn originalFn = Sum.ofLongs();
      MergingCombineFn<Void, long[]> fn =
          new MergingCombineFn<>(
              originalFn, originalFn.getAccumulatorCoder(p.getCoderRegistry(), VarLongCoder.of()));
  
      long[] inputAccum = originalFn.createAccumulator();
      inputAccum = originalFn.addInput(inputAccum, 1L);
      inputAccum = originalFn.addInput(inputAccum, 2L);
      assertThat(inputAccum[0], equalTo(3L));
  
      long[] otherAccum = originalFn.createAccumulator();
      otherAccum = originalFn.addInput(otherAccum, 4L);
      assertThat(otherAccum[0], equalTo(4L));
  
      List<long[]> first = fn.createAccumulator();
      first = fn.addInput(first, inputAccum);
      assertThat(first, hasItem(inputAccum));
      assertThat(inputAccum.length, equalTo(1));
      assertThat(inputAccum[0], equalTo(3L));
  
      List<long[]> second = fn.createAccumulator();
      second = fn.addInput(second, inputAccum);
      assertThat(second, hasItem(inputAccum));
      assertThat(inputAccum.length, equalTo(1));
      assertThat(inputAccum[0], equalTo(3L));
  
      List<long[]> mergeToSecond = fn.createAccumulator();
      mergeToSecond = fn.addInput(mergeToSecond, otherAccum);
      assertThat(mergeToSecond, hasItem(otherAccum));
      assertThat(otherAccum.length, equalTo(1));
      assertThat(otherAccum[0], equalTo(4L));
  
      List<long[]> firstSelfMerged = fn.mergeAccumulators(ImmutableList.of(first));
      List<long[]> compactedFirst = fn.compact(firstSelfMerged);
      assertThat(firstSelfMerged, equalTo(compactedFirst));
      assertThat(firstSelfMerged, hasSize(1));
      assertThat(firstSelfMerged.get(0)[0], equalTo(3L));
  
      List<long[]> secondMerged = fn.mergeAccumulators(ImmutableList.of(second, mergeToSecond));
      List<long[]> secondCompacted = fn.compact(secondMerged);
      assertThat(secondCompacted, hasSize(1));
      assertThat(secondCompacted.get(0)[0], equalTo(7L));
      assertThat(firstSelfMerged, equalTo(compactedFirst));
      assertThat(firstSelfMerged, hasSize(1));
      assertThat(firstSelfMerged.get(0)[0], equalTo(3L));
    }
  }
  