EventTimeTriggerTest.java example

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

import com.google.common.collect.Lists;
import org.apache.flink.streaming.api.windowing.triggers.EventTimeTrigger;
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;
import static org.junit.Assert.assertTrue;

/**
 * Tests for {@link EventTimeTrigger}.
 */
public class EventTimeTriggerTest {

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

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

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

		assertEquals(TriggerResult.FIRE, testHarness.advanceWatermark(2, new TimeWindow(0, 2)));

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

		assertEquals(TriggerResult.FIRE, testHarness.advanceWatermark(4, new TimeWindow(2, 4)));

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

	/**
	 * Verify that late elements trigger immediately and also that we don't set a timer
	 * for those.
	 */
	@Test
	public void testLateElementTriggersImmediately() throws Exception {
		TriggerTestHarness<Object, TimeWindow> testHarness =
				new TriggerTestHarness<>(EventTimeTrigger.create(), new TimeWindow.Serializer());

		testHarness.advanceWatermark(2);

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

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


	/**
	 * Verify that clear() does not leak across windows.
	 */
	@Test
	public void testClear() throws Exception {
		TriggerTestHarness<Object, TimeWindow> testHarness =
				new TriggerTestHarness<>(EventTimeTrigger.create(), 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(0, testHarness.numStateEntries());
		assertEquals(0, testHarness.numProcessingTimeTimers());
		assertEquals(2, testHarness.numEventTimeTimers());
		assertEquals(1, testHarness.numEventTimeTimers(new TimeWindow(0, 2)));
		assertEquals(1, testHarness.numEventTimeTimers(new TimeWindow(2, 4)));

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

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

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

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

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

		assertTrue(EventTimeTrigger.create().canMerge());

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

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

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

		assertEquals(TriggerResult.FIRE, testHarness.advanceWatermark(4, new TimeWindow(0, 4)));

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