LateDataDroppingDoFnRunnerTest.java example

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/*
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 * 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.Matchers.containsInAnyOrder;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat;
import static org.mockito.Mockito.when;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
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.util.WindowedValue;
import org.apache.beam.sdk.values.WindowingStrategy;
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().longValue();
    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().longValue();
    assertEquals(1, droppedValues);
  }

  private <T> WindowedValue<T> createDatum(T element, long timestampMillis) {
    Instant timestamp = new Instant(timestampMillis);
    return WindowedValue.of(
        element,
        timestamp,
        Arrays.asList(WINDOW_FN.assignWindow(timestamp)),
        PaneInfo.NO_FIRING);
  }
}