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* Licensed to the Apache Software Foundation (ASF) under one
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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
* limitations under the License.
*/
package org.apache.beam.runners.core.triggers;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import org.apache.beam.runners.core.triggers.TriggerStateMachineTester.SimpleTriggerStateMachineTester;
import org.apache.beam.sdk.transforms.windowing.FixedWindows;
import org.apache.beam.sdk.transforms.windowing.IntervalWindow;
import org.apache.beam.sdk.transforms.windowing.Sessions;
import org.apache.beam.sdk.transforms.windowing.SlidingWindows;
import org.joda.time.Duration;
import org.joda.time.Instant;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/**
* Tests the {@link DefaultTriggerStateMachine}, which should be equivalent to
* {@code Repeatedly.forever(AfterWatermark.pastEndOfWindow())}.
*/
@RunWith(JUnit4.class)
public class DefaultTriggerStateMachineTest {
SimpleTriggerStateMachineTester<IntervalWindow> tester;
@Test
public void testDefaultTriggerFixedWindows() throws Exception {
tester = TriggerStateMachineTester.forTrigger(
DefaultTriggerStateMachine.of(),
FixedWindows.of(Duration.millis(100)));
tester.injectElements(
1, // [0, 100)
101); // [100, 200)
IntervalWindow firstWindow = new IntervalWindow(new Instant(0), new Instant(100));
IntervalWindow secondWindow = new IntervalWindow(new Instant(100), new Instant(200));
// Advance the watermark almost to the end of the first window.
tester.advanceInputWatermark(new Instant(99));
assertFalse(tester.shouldFire(firstWindow));
assertFalse(tester.shouldFire(secondWindow));
// Advance watermark past end of the first window, which is then ready
tester.advanceInputWatermark(new Instant(100));
assertTrue(tester.shouldFire(firstWindow));
assertFalse(tester.shouldFire(secondWindow));
// Fire, but the first window is still allowed to fire
tester.fireIfShouldFire(firstWindow);
assertTrue(tester.shouldFire(firstWindow));
assertFalse(tester.shouldFire(secondWindow));
// Advance watermark to 200, then both are ready
tester.advanceInputWatermark(new Instant(200));
assertTrue(tester.shouldFire(firstWindow));
assertTrue(tester.shouldFire(secondWindow));
assertFalse(tester.isMarkedFinished(firstWindow));
assertFalse(tester.isMarkedFinished(secondWindow));
}
@Test
public void testDefaultTriggerSlidingWindows() throws Exception {
tester = TriggerStateMachineTester.forTrigger(
DefaultTriggerStateMachine.of(),
SlidingWindows.of(Duration.millis(100)).every(Duration.millis(50)));
tester.injectElements(
1, // [-50, 50), [0, 100)
50); // [0, 100), [50, 150)
IntervalWindow firstWindow = new IntervalWindow(new Instant(-50), new Instant(50));
IntervalWindow secondWindow = new IntervalWindow(new Instant(0), new Instant(100));
IntervalWindow thirdWindow = new IntervalWindow(new Instant(50), new Instant(150));
assertFalse(tester.shouldFire(firstWindow));
assertFalse(tester.shouldFire(secondWindow));
assertFalse(tester.shouldFire(thirdWindow));
// At 50, the first becomes ready; it stays ready after firing
tester.advanceInputWatermark(new Instant(50));
assertTrue(tester.shouldFire(firstWindow));
assertFalse(tester.shouldFire(secondWindow));
assertFalse(tester.shouldFire(thirdWindow));
tester.fireIfShouldFire(firstWindow);
assertTrue(tester.shouldFire(firstWindow));
assertFalse(tester.shouldFire(secondWindow));
assertFalse(tester.shouldFire(thirdWindow));
// At 99, the first is still the only one ready
tester.advanceInputWatermark(new Instant(99));
assertTrue(tester.shouldFire(firstWindow));
assertFalse(tester.shouldFire(secondWindow));
assertFalse(tester.shouldFire(thirdWindow));
// At 100, the first and second are ready
tester.advanceInputWatermark(new Instant(100));
assertTrue(tester.shouldFire(firstWindow));
assertTrue(tester.shouldFire(secondWindow));
assertFalse(tester.shouldFire(thirdWindow));
tester.fireIfShouldFire(firstWindow);
assertFalse(tester.isMarkedFinished(firstWindow));
assertFalse(tester.isMarkedFinished(secondWindow));
assertFalse(tester.isMarkedFinished(thirdWindow));
}
@Test
public void testDefaultTriggerSessions() throws Exception {
tester = TriggerStateMachineTester.forTrigger(
DefaultTriggerStateMachine.of(),
Sessions.withGapDuration(Duration.millis(100)));
tester.injectElements(
1, // [1, 101)
50); // [50, 150)
tester.mergeWindows();
IntervalWindow firstWindow = new IntervalWindow(new Instant(1), new Instant(101));
IntervalWindow secondWindow = new IntervalWindow(new Instant(50), new Instant(150));
IntervalWindow mergedWindow = new IntervalWindow(new Instant(1), new Instant(150));
// Not ready in any window yet
tester.advanceInputWatermark(new Instant(100));
assertFalse(tester.shouldFire(firstWindow));
assertFalse(tester.shouldFire(secondWindow));
assertFalse(tester.shouldFire(mergedWindow));
// The first window is "ready": the caller owns knowledge of which windows are merged away
tester.advanceInputWatermark(new Instant(149));
assertTrue(tester.shouldFire(firstWindow));
assertFalse(tester.shouldFire(secondWindow));
assertFalse(tester.shouldFire(mergedWindow));
// Now ready on all windows
tester.advanceInputWatermark(new Instant(150));
assertTrue(tester.shouldFire(firstWindow));
assertTrue(tester.shouldFire(secondWindow));
assertTrue(tester.shouldFire(mergedWindow));
// Ensure it repeats
tester.fireIfShouldFire(mergedWindow);
assertTrue(tester.shouldFire(mergedWindow));
assertFalse(tester.isMarkedFinished(mergedWindow));
}
}