CountTriggerTest.java example

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/*
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 * 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.flink.streaming.runtime.operators.windowing;

import com.google.common.collect.Lists;
import org.apache.flink.streaming.api.windowing.triggers.CountTrigger;
import org.apache.flink.streaming.api.windowing.triggers.TriggerResult;
import org.apache.flink.streaming.api.windowing.windows.TimeWindow;
import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
import org.junit.Test;

import static org.junit.Assert.assertEquals;

/**
 * Tests for {@link CountTrigger}.
 */
public class CountTriggerTest {

	/**
	 * Verify that state of separate windows does not leak into other windows.
	 */
	@Test
	public void testWindowSeparationAndFiring() throws Exception {
		TriggerTestHarness<Object, TimeWindow> testHarness =
				new TriggerTestHarness<>(CountTrigger.<TimeWindow>of(3), new TimeWindow.Serializer());

		assertEquals(TriggerResult.CONTINUE, testHarness.processElement(new StreamRecord<Object>(1), new TimeWindow(0, 2)));
		assertEquals(TriggerResult.CONTINUE, testHarness.processElement(new StreamRecord<Object>(1), new TimeWindow(2, 4)));

		// shouldn't have any timers
		assertEquals(0, testHarness.numProcessingTimeTimers());
		assertEquals(0, testHarness.numEventTimeTimers());

		assertEquals(2, testHarness.numStateEntries());
		assertEquals(1, testHarness.numStateEntries(new TimeWindow(0, 2)));
		assertEquals(1, testHarness.numStateEntries(new TimeWindow(2, 4)));

		assertEquals(TriggerResult.CONTINUE, testHarness.processElement(new StreamRecord<Object>(1), new TimeWindow(0, 2)));
		assertEquals(TriggerResult.FIRE, testHarness.processElement(new StreamRecord<Object>(1), new TimeWindow(0, 2)));
		assertEquals(TriggerResult.CONTINUE, testHarness.processElement(new StreamRecord<Object>(1), new TimeWindow(2, 4)));

		// right now, CountTrigger will clear it's state in onElement when firing
		// ideally, this should be moved to onFire()
		assertEquals(1, testHarness.numStateEntries());
		assertEquals(0, testHarness.numStateEntries(new TimeWindow(0, 2)));
		assertEquals(1, testHarness.numStateEntries(new TimeWindow(2, 4)));

		assertEquals(TriggerResult.FIRE, testHarness.processElement(new StreamRecord<Object>(1), new TimeWindow(2, 4)));

		// now all state should be gone
		assertEquals(0, testHarness.numStateEntries());
	}

	/**
	 * Verify that clear() does not leak across windows.
	 */
	@Test
	public void testClear() throws Exception {
		TriggerTestHarness<Object, TimeWindow> testHarness =
				new TriggerTestHarness<>(CountTrigger.<TimeWindow>of(3), new TimeWindow.Serializer());

		assertEquals(TriggerResult.CONTINUE, testHarness.processElement(new StreamRecord<Object>(1), new TimeWindow(0, 2)));
		assertEquals(TriggerResult.CONTINUE, testHarness.processElement(new StreamRecord<Object>(1), new TimeWindow(2, 4)));

		// shouldn't have any timers
		assertEquals(0, testHarness.numProcessingTimeTimers());
		assertEquals(0, testHarness.numEventTimeTimers());

		assertEquals(2, testHarness.numStateEntries());
		assertEquals(1, testHarness.numStateEntries(new TimeWindow(0, 2)));
		assertEquals(1, testHarness.numStateEntries(new TimeWindow(2, 4)));

		testHarness.clearTriggerState(new TimeWindow(2, 4));

		assertEquals(1, testHarness.numStateEntries());
		assertEquals(1, testHarness.numStateEntries(new TimeWindow(0, 2)));
		assertEquals(0, testHarness.numStateEntries(new TimeWindow(2, 4)));

		testHarness.clearTriggerState(new TimeWindow(0, 2));

		assertEquals(0, testHarness.numStateEntries());
		assertEquals(0, testHarness.numStateEntries(new TimeWindow(0, 2)));
		assertEquals(0, testHarness.numStateEntries(new TimeWindow(2, 4)));
	}

	@Test
	public void testMergingWindows() throws Exception {
		TriggerTestHarness<Object, TimeWindow> testHarness =
				new TriggerTestHarness<>(CountTrigger.<TimeWindow>of(3), new TimeWindow.Serializer());

		assertEquals(TriggerResult.CONTINUE, testHarness.processElement(new StreamRecord<Object>(1), new TimeWindow(0, 2)));
		assertEquals(TriggerResult.CONTINUE, testHarness.processElement(new StreamRecord<Object>(1), new TimeWindow(2, 4)));
		assertEquals(TriggerResult.CONTINUE, testHarness.processElement(new StreamRecord<Object>(1), new TimeWindow(4, 6)));

		// shouldn't have any timers
		assertEquals(0, testHarness.numProcessingTimeTimers());
		assertEquals(0, testHarness.numEventTimeTimers());

		assertEquals(3, testHarness.numStateEntries());
		assertEquals(1, testHarness.numStateEntries(new TimeWindow(0, 2)));
		assertEquals(1, testHarness.numStateEntries(new TimeWindow(2, 4)));
		assertEquals(1, testHarness.numStateEntries(new TimeWindow(4, 6)));

		testHarness.mergeWindows(new TimeWindow(0, 4), Lists.newArrayList(new TimeWindow(0, 2), new TimeWindow(2, 4)));

		assertEquals(2, testHarness.numStateEntries());
		assertEquals(0, testHarness.numStateEntries(new TimeWindow(0, 2)));
		assertEquals(0, testHarness.numStateEntries(new TimeWindow(2, 4)));
		assertEquals(1, testHarness.numStateEntries(new TimeWindow(0, 4)));
		assertEquals(1, testHarness.numStateEntries(new TimeWindow(4, 6)));

		assertEquals(TriggerResult.FIRE, testHarness.processElement(new StreamRecord<Object>(1), new TimeWindow(0, 4)));

		assertEquals(1, testHarness.numStateEntries());
		assertEquals(0, testHarness.numStateEntries(new TimeWindow(0, 4)));
		assertEquals(1, testHarness.numStateEntries(new TimeWindow(4, 6)));

		assertEquals(TriggerResult.CONTINUE, testHarness.processElement(new StreamRecord<Object>(1), new TimeWindow(4, 6)));
		assertEquals(TriggerResult.FIRE, testHarness.processElement(new StreamRecord<Object>(1), new TimeWindow(4, 6)));

		assertEquals(0, testHarness.numStateEntries());
	}

	@Test
	public void testMergeSubsumingWindow() throws Exception {
		TriggerTestHarness<Object, TimeWindow> testHarness =
				new TriggerTestHarness<>(CountTrigger.<TimeWindow>of(3), new TimeWindow.Serializer());

		assertEquals(TriggerResult.CONTINUE, testHarness.processElement(new StreamRecord<Object>(1), new TimeWindow(2, 4)));
		assertEquals(TriggerResult.CONTINUE, testHarness.processElement(new StreamRecord<Object>(1), new TimeWindow(4, 6)));

		// shouldn't have any timers
		assertEquals(0, testHarness.numProcessingTimeTimers());
		assertEquals(0, testHarness.numEventTimeTimers());

		assertEquals(2, testHarness.numStateEntries());
		assertEquals(1, testHarness.numStateEntries(new TimeWindow(2, 4)));
		assertEquals(1, testHarness.numStateEntries(new TimeWindow(4, 6)));

		testHarness.mergeWindows(new TimeWindow(0, 8), Lists.newArrayList(new TimeWindow(2, 4), new TimeWindow(4, 6)));

		assertEquals(1, testHarness.numStateEntries());
		assertEquals(0, testHarness.numStateEntries(new TimeWindow(2, 4)));
		assertEquals(0, testHarness.numStateEntries(new TimeWindow(4, 6)));
		assertEquals(1, testHarness.numStateEntries(new TimeWindow(0, 8)));

		assertEquals(TriggerResult.FIRE, testHarness.processElement(new StreamRecord<Object>(1), new TimeWindow(0, 8)));

		assertEquals(0, testHarness.numStateEntries());
	}
}