OffsetRangeTrackerTest.java

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 * 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
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 */
package org.apache.beam.sdk.transforms.splittabledofn;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Tests for {@link OffsetRangeTracker}. */
@RunWith(JUnit4.class)
public class OffsetRangeTrackerTest {
  @Rule public final ExpectedException expected = ExpectedException.none();

  @Test
  public void testTryClaim() throws Exception {
    OffsetRange range = new OffsetRange(100, 200);
    OffsetRangeTracker tracker = new OffsetRangeTracker(range);
    assertEquals(range, tracker.currentRestriction());
    assertTrue(tracker.tryClaim(100));
    assertTrue(tracker.tryClaim(150));
    assertTrue(tracker.tryClaim(199));
    assertFalse(tracker.tryClaim(200));
  }

  @Test
  public void testCheckpointUnstarted() throws Exception {
    OffsetRangeTracker tracker = new OffsetRangeTracker(new OffsetRange(100, 200));
    OffsetRange checkpoint = tracker.checkpoint();
    assertEquals(new OffsetRange(100, 100), tracker.currentRestriction());
    assertEquals(new OffsetRange(100, 200), checkpoint);
  }

  @Test
  public void testCheckpointJustStarted() throws Exception {
    OffsetRangeTracker tracker = new OffsetRangeTracker(new OffsetRange(100, 200));
    assertTrue(tracker.tryClaim(100));
    OffsetRange checkpoint = tracker.checkpoint();
    assertEquals(new OffsetRange(100, 101), tracker.currentRestriction());
    assertEquals(new OffsetRange(101, 200), checkpoint);
  }

  @Test
  public void testCheckpointRegular() throws Exception {
    OffsetRangeTracker tracker = new OffsetRangeTracker(new OffsetRange(100, 200));
    assertTrue(tracker.tryClaim(105));
    assertTrue(tracker.tryClaim(110));
    OffsetRange checkpoint = tracker.checkpoint();
    assertEquals(new OffsetRange(100, 111), tracker.currentRestriction());
    assertEquals(new OffsetRange(111, 200), checkpoint);
  }

  @Test
  public void testCheckpointClaimedLast() throws Exception {
    OffsetRangeTracker tracker = new OffsetRangeTracker(new OffsetRange(100, 200));
    assertTrue(tracker.tryClaim(105));
    assertTrue(tracker.tryClaim(110));
    assertTrue(tracker.tryClaim(199));
    OffsetRange checkpoint = tracker.checkpoint();
    assertEquals(new OffsetRange(100, 200), tracker.currentRestriction());
    assertEquals(new OffsetRange(200, 200), checkpoint);
  }

  @Test
  public void testCheckpointAfterFailedClaim() throws Exception {
    OffsetRangeTracker tracker = new OffsetRangeTracker(new OffsetRange(100, 200));
    assertTrue(tracker.tryClaim(105));
    assertTrue(tracker.tryClaim(110));
    assertTrue(tracker.tryClaim(160));
    assertFalse(tracker.tryClaim(240));
    OffsetRange checkpoint = tracker.checkpoint();
    assertEquals(new OffsetRange(100, 161), tracker.currentRestriction());
    assertEquals(new OffsetRange(161, 200), checkpoint);
  }

  @Test
  public void testNonMonotonicClaim() throws Exception {
    expected.expectMessage("Trying to claim offset 103 while last attempted was 110");
    OffsetRangeTracker tracker = new OffsetRangeTracker(new OffsetRange(100, 200));
    assertTrue(tracker.tryClaim(105));
    assertTrue(tracker.tryClaim(110));
    tracker.tryClaim(103);
  }

  @Test
  public void testClaimBeforeStartOfRange() throws Exception {
    expected.expectMessage("Trying to claim offset 90 before start of the range [100, 200)");
    OffsetRangeTracker tracker = new OffsetRangeTracker(new OffsetRange(100, 200));
    tracker.tryClaim(90);
  }

  @Test
  public void testCheckDoneAfterTryClaimPastEndOfRange() {
    OffsetRangeTracker tracker = new OffsetRangeTracker(new OffsetRange(100, 200));
    assertTrue(tracker.tryClaim(150));
    assertTrue(tracker.tryClaim(175));
    assertFalse(tracker.tryClaim(220));
    tracker.checkDone();
  }

  @Test
  public void testCheckDoneAfterTryClaimAtEndOfRange() {
    OffsetRangeTracker tracker = new OffsetRangeTracker(new OffsetRange(100, 200));
    assertTrue(tracker.tryClaim(150));
    assertTrue(tracker.tryClaim(175));
    assertFalse(tracker.tryClaim(200));
    tracker.checkDone();
  }

  @Test
  public void testCheckDoneAfterTryClaimRightBeforeEndOfRange() {
    OffsetRangeTracker tracker = new OffsetRangeTracker(new OffsetRange(100, 200));
    assertTrue(tracker.tryClaim(150));
    assertTrue(tracker.tryClaim(175));
    assertTrue(tracker.tryClaim(199));
    tracker.checkDone();
  }

  @Test
  public void testCheckDoneWhenNotDone() {
    OffsetRangeTracker tracker = new OffsetRangeTracker(new OffsetRange(100, 200));
    assertTrue(tracker.tryClaim(150));
    assertTrue(tracker.tryClaim(175));
    expected.expectMessage(
        "Last attempted offset was 175 in range [100, 200), "
            + "claiming work in [176, 200) was not attempted");
    tracker.checkDone();
  }

  @Test
  public void testCheckDoneWhenExplicitlyMarkedDone() {
    OffsetRangeTracker tracker = new OffsetRangeTracker(new OffsetRange(100, 200));
    assertTrue(tracker.tryClaim(150));
    assertTrue(tracker.tryClaim(175));
    tracker.markDone();
    tracker.checkDone();
  }
}