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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,
   * 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.runners.core.metrics;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.equalTo;
  
  import org.apache.beam.sdk.metrics.MetricName;
  import org.apache.beam.sdk.util.HistogramData;
  import org.apache.beam.sdk.values.KV;
  import org.junit.Assert;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link HistogramCell}. */
  @RunWith(JUnit4.class)
  public class HistogramCellTest {
    private HistogramData.BucketType bucketType = HistogramData.LinearBuckets.of(0, 10, 100);
  
    @Test
    public void testDeltaAndCumulative() {
      HistogramCell cell = new HistogramCell(KV.of(MetricName.named("hello", "world"), bucketType));
      cell.update(5);
      cell.update(7);
      HistogramData expected = HistogramData.linear(0, 10, 100);
      expected.record(5, 7);
      assertThat(cell.getCumulative(), equalTo(expected));
      assertThat("getCumulative is idempotent", cell.getCumulative(), equalTo(expected));
  
      assertThat(cell.getDirty().beforeCommit(), equalTo(true));
      cell.getDirty().afterCommit();
      assertThat(cell.getDirty().beforeCommit(), equalTo(false));
  
      cell.update(30);
      expected.record(30);
      assertThat(cell.getCumulative(), equalTo(expected));
  
      assertThat(
          "Adding a new value made the cell dirty", cell.getDirty().beforeCommit(), equalTo(true));
    }
  
    @Test
    public void testEquals() {
      HistogramCell cell = new HistogramCell(KV.of(MetricName.named("hello", "world"), bucketType));
      HistogramCell equalCell =
          new HistogramCell(KV.of(MetricName.named("hello", "world"), bucketType));
      Assert.assertEquals(equalCell, cell);
      Assert.assertEquals(equalCell.hashCode(), cell.hashCode());
    }
  
    @Test
    public void testNotEquals() {
      HistogramCell cell = new HistogramCell(KV.of(MetricName.named("hello", "world"), bucketType));
      Assert.assertNotEquals(cell, new Object());
  
      HistogramCell differentDirty =
          new HistogramCell(KV.of(MetricName.named("namespace", "name"), bucketType));
      differentDirty.getDirty().afterModification();
      Assert.assertNotEquals(cell, differentDirty);
      Assert.assertNotEquals(cell.hashCode(), differentDirty.hashCode());
  
      HistogramCell differentValue =
          new HistogramCell(KV.of(MetricName.named("namespace", "name"), bucketType));
      differentValue.update(1);
      Assert.assertNotEquals(cell, differentValue);
      Assert.assertNotEquals(cell.hashCode(), differentValue.hashCode());
  
      HistogramCell differentName =
          new HistogramCell(KV.of(MetricName.named("DIFFERENT", "DIFFERENT"), bucketType));
      Assert.assertNotEquals(cell, differentName);
      Assert.assertNotEquals(cell.hashCode(), differentName.hashCode());
  
      HistogramCell differentBuckets =
          new HistogramCell(
              KV.of(
                  MetricName.named("DIFFERENT", "DIFFERENT"),
                  HistogramData.LinearBuckets.of(1, 10, 100)));
      Assert.assertNotEquals(cell, differentBuckets);
      Assert.assertNotEquals(cell.hashCode(), differentBuckets.hashCode());
    }
  
    @Test
    public void testReset() {
      HistogramCell cell = new HistogramCell(KV.of(MetricName.named("hello", "world"), bucketType));
      cell.update(2);
      Assert.assertEquals(1, cell.getCumulative().getTotalCount());
      Assert.assertNotEquals(cell.getDirty(), new DirtyState());
  
      cell.reset();
      assertThat(cell.getCumulative(), equalTo(HistogramData.linear(0, 10, 100)));
      assertThat(cell.getDirty(), equalTo(new DirtyState()));
    }
  
    @Test
    public void testUpdateWithHistogramData() {
      HistogramCell cell = new HistogramCell(KV.of(MetricName.named("hello", "world"), bucketType));
      HistogramData data = HistogramData.linear(0, 10, 100);
      data.record(5, 7, 9);
      cell.update(data);
      assertThat(cell.getCumulative(), equalTo(data));
    }
  }
  