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.runners.core;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.containsInAnyOrder;
  import static org.junit.Assert.assertEquals;
  import static org.mockito.Mockito.when;
  
  import java.util.Arrays;
  import org.apache.beam.runners.core.LateDataDroppingDoFnRunner.LateDataFilter;
  import org.apache.beam.runners.core.metrics.MetricsContainerImpl;
  import org.apache.beam.sdk.metrics.MetricName;
  import org.apache.beam.sdk.metrics.MetricsEnvironment;
  import org.apache.beam.sdk.transforms.windowing.FixedWindows;
  import org.apache.beam.sdk.transforms.windowing.PaneInfo;
  import org.apache.beam.sdk.values.WindowedValue;
  import org.apache.beam.sdk.values.WindowedValues;
  import org.apache.beam.sdk.values.WindowingStrategy;
  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.Iterables;
  import org.joda.time.Duration;
  import org.joda.time.Instant;
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  import org.mockito.Mock;
  import org.mockito.MockitoAnnotations;
  
  /** Unit tests for {@link LateDataDroppingDoFnRunner}. */
  @RunWith(JUnit4.class)
  public class LateDataDroppingDoFnRunnerTest {
    private static final FixedWindows WINDOW_FN = FixedWindows.of(Duration.millis(10));
  
    @Mock private TimerInternals mockTimerInternals;
  
    @Before
    public void setUp() {
      MockitoAnnotations.initMocks(this);
    }
  
    @Test
    public void testLateDataFilter() throws Exception {
      MetricsContainerImpl container = new MetricsContainerImpl("any");
      MetricsEnvironment.setCurrentContainer(container);
      when(mockTimerInternals.currentInputWatermarkTime()).thenReturn(new Instant(15L));
  
      LateDataFilter lateDataFilter =
          new LateDataFilter(WindowingStrategy.of(WINDOW_FN), mockTimerInternals);
  
      Iterable<WindowedValue<Integer>> actual =
          lateDataFilter.filter(
              "a",
              ImmutableList.of(
                  createDatum(13, 13L),
                  createDatum(5, 5L), // late element, earlier than 4L.
                  createDatum(16, 16L),
                  createDatum(18, 18L)));
  
      Iterable<WindowedValue<Integer>> expected =
          ImmutableList.of(createDatum(13, 13L), createDatum(16, 16L), createDatum(18, 18L));
      assertThat(expected, containsInAnyOrder(Iterables.toArray(actual, WindowedValue.class)));
      long droppedValues =
          container
              .getCounter(
                  MetricName.named(
                      LateDataDroppingDoFnRunner.class,
                      LateDataDroppingDoFnRunner.DROPPED_DUE_TO_LATENESS))
              .getCumulative();
      assertEquals(1, droppedValues);
      // Ensure that reiterating returns the same results and doesn't increment the counter again.
      assertThat(expected, containsInAnyOrder(Iterables.toArray(actual, WindowedValue.class)));
      droppedValues =
          container
              .getCounter(
                  MetricName.named(
                      LateDataDroppingDoFnRunner.class,
                      LateDataDroppingDoFnRunner.DROPPED_DUE_TO_LATENESS))
              .getCumulative();
      assertEquals(1, droppedValues);
    }
  
    private <T> WindowedValue<T> createDatum(T element, long timestampMillis) {
      Instant timestamp = new Instant(timestampMillis);
      return WindowedValues.of(
          element, timestamp, Arrays.asList(WINDOW_FN.assignWindow(timestamp)), PaneInfo.NO_FIRING);
    }
  }
  