/*
* 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.kafka.streams.kstream;
import org.apache.kafka.streams.kstream.internals.TimeWindow;
import org.junit.Test;
import java.util.Map;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assert.fail;
public class TimeWindowsTest {
private static final long ANY_SIZE = 123L;
@Test
public void shouldSetWindowSize() {
assertEquals(ANY_SIZE, TimeWindows.of(ANY_SIZE).sizeMs);
}
@Test
public void shouldSetWindowAdvance() {
final long anyAdvance = 4;
assertEquals(anyAdvance, TimeWindows.of(ANY_SIZE).advanceBy(anyAdvance).advanceMs);
}
@Test
public void shouldSetWindowRetentionTime() {
assertEquals(ANY_SIZE, TimeWindows.of(ANY_SIZE).until(ANY_SIZE).maintainMs());
}
@Test
public void shouldUseWindowSizeAsRentitionTimeIfWindowSizeIsLargerThanDefaultRetentionTime() {
final long windowSize = 2 * Windows.DEFAULT_MAINTAIN_DURATION_MS;
assertEquals(windowSize, TimeWindows.of(windowSize).maintainMs());
}
@Test
public void shouldHaveSaneEqualsAndHashCode() {
TimeWindows w1 = TimeWindows.of(ANY_SIZE);
TimeWindows w2 = TimeWindows.of(w1.sizeMs);
// Reflexive
assertEquals(w1, w1);
assertEquals(w1.hashCode(), w1.hashCode());
// Symmetric
assertEquals(w1, w2);
assertEquals(w2, w1);
assertEquals(w1.hashCode(), w2.hashCode());
// Transitive
TimeWindows w3 = TimeWindows.of(w2.sizeMs);
assertEquals(w2, w3);
assertEquals(w1, w3);
assertEquals(w1.hashCode(), w3.hashCode());
// Inequality scenarios
assertNotEquals("must be false for null", null, w1);
assertNotEquals("must be false for different window types", UnlimitedWindows.of(), w1);
assertNotEquals("must be false for different types", new Object(), w1);
TimeWindows differentWindowSize = TimeWindows.of(w1.sizeMs + 1);
assertNotEquals("must be false when window sizes are different", differentWindowSize, w1);
TimeWindows differentAdvanceInterval = w1.advanceBy(w1.advanceMs - 1);
assertNotEquals("must be false when advance intervals are different", differentAdvanceInterval, w1);
}
@Test(expected = IllegalArgumentException.class)
public void windowSizeMustNotBeZero() {
TimeWindows.of(0);
}
@Test(expected = IllegalArgumentException.class)
public void windowSizeMustNotBeNegative() {
TimeWindows.of(-1);
}
@Test
public void advanceIntervalMustNotBeZero() {
final TimeWindows windowSpec = TimeWindows.of(ANY_SIZE);
try {
windowSpec.advanceBy(0);
fail("should not accept zero advance parameter");
} catch (final IllegalArgumentException e) {
// expected
}
}
@Test
public void advanceIntervalMustNotBeNegative() {
final TimeWindows windowSpec = TimeWindows.of(ANY_SIZE);
try {
windowSpec.advanceBy(-1);
fail("should not accept negative advance parameter");
} catch (final IllegalArgumentException e) {
// expected
}
}
@Test
public void advanceIntervalMustNotBeLargerThanWindowSize() {
final TimeWindows windowSpec = TimeWindows.of(ANY_SIZE);
try {
windowSpec.advanceBy(ANY_SIZE + 1);
fail("should not accept advance greater than window size");
} catch (final IllegalArgumentException e) {
// expected
}
}
@Test
public void retentionTimeMustNoBeSmallerThanWindowSize() {
final TimeWindows windowSpec = TimeWindows.of(ANY_SIZE);
try {
windowSpec.until(ANY_SIZE - 1);
fail("should not accept retention time smaller than window size");
} catch (final IllegalArgumentException e) {
// expected
}
}
@Test
public void shouldComputeWindowsForHoppingWindows() {
TimeWindows windows = TimeWindows.of(12L).advanceBy(5L);
Map<Long, TimeWindow> matched = windows.windowsFor(21L);
assertEquals(12L / 5L + 1, matched.size());
assertEquals(new TimeWindow(10L, 22L), matched.get(10L));
assertEquals(new TimeWindow(15L, 27L), matched.get(15L));
assertEquals(new TimeWindow(20L, 32L), matched.get(20L));
}
@Test
public void shouldComputeWindowsForBarelyOverlappingHoppingWindows() {
TimeWindows windows = TimeWindows.of(6L).advanceBy(5L);
Map<Long, TimeWindow> matched = windows.windowsFor(7L);
assertEquals(1, matched.size());
assertEquals(new TimeWindow(5L, 11L), matched.get(5L));
}
@Test
public void shouldComputeWindowsForTumblingWindows() {
TimeWindows windows = TimeWindows.of(12L);
Map<Long, TimeWindow> matched = windows.windowsFor(21L);
assertEquals(1, matched.size());
assertEquals(new TimeWindow(12L, 24L), matched.get(12L));
}
}