/*
* 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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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.api.common.ExecutionConfig;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.windowing.assigners.EventTimeSessionWindows;
import org.apache.flink.streaming.api.windowing.assigners.MergingWindowAssigner;
import org.apache.flink.streaming.api.windowing.assigners.WindowAssigner;
import org.apache.flink.streaming.api.windowing.time.Time;
import org.apache.flink.streaming.api.windowing.triggers.EventTimeTrigger;
import org.apache.flink.streaming.api.windowing.windows.TimeWindow;
import org.apache.flink.util.TestLogger;
import org.junit.Test;
import org.mockito.Matchers;
import java.util.Collection;
import static org.apache.flink.streaming.runtime.operators.windowing.StreamRecordMatchers.timeWindow;
import static org.hamcrest.CoreMatchers.containsString;
import static org.hamcrest.Matchers.contains;
import static org.hamcrest.Matchers.containsInAnyOrder;
import static org.hamcrest.Matchers.instanceOf;
import static org.junit.Assert.*;
import static org.mockito.Matchers.anyCollection;
import static org.mockito.Mockito.*;
/**
* Tests for {@link EventTimeSessionWindows}
*/
public class EventTimeSessionWindowsTest extends TestLogger {
@Test
public void testWindowAssignment() {
final int SESSION_GAP = 5000;
WindowAssigner.WindowAssignerContext mockContext =
mock(WindowAssigner.WindowAssignerContext.class);
EventTimeSessionWindows assigner = EventTimeSessionWindows.withGap(Time.milliseconds(SESSION_GAP));
assertThat(assigner.assignWindows("String", 0L, mockContext), contains(timeWindow(0, 0 + SESSION_GAP)));
assertThat(assigner.assignWindows("String", 4999L, mockContext), contains(timeWindow(4999, 4999 + SESSION_GAP)));
assertThat(assigner.assignWindows("String", 5000L, mockContext), contains(timeWindow(5000, 5000 + SESSION_GAP)));
}
@Test
public void testMergeSinglePointWindow() {
MergingWindowAssigner.MergeCallback callback = mock(MergingWindowAssigner.MergeCallback.class);
EventTimeSessionWindows assigner = EventTimeSessionWindows.withGap(Time.milliseconds(5000));
assigner.mergeWindows(Lists.newArrayList(new TimeWindow(0, 0)), callback);
verify(callback, never()).merge(anyCollection(), Matchers.anyObject());
}
@Test
public void testMergeSingleWindow() {
MergingWindowAssigner.MergeCallback callback = mock(MergingWindowAssigner.MergeCallback.class);
EventTimeSessionWindows assigner = EventTimeSessionWindows.withGap(Time.milliseconds(5000));
assigner.mergeWindows(Lists.newArrayList(new TimeWindow(0, 1)), callback);
verify(callback, never()).merge(anyCollection(), Matchers.anyObject());
}
@Test
public void testMergeConsecutiveWindows() {
MergingWindowAssigner.MergeCallback callback = mock(MergingWindowAssigner.MergeCallback.class);
EventTimeSessionWindows assigner = EventTimeSessionWindows.withGap(Time.milliseconds(5000));
assigner.mergeWindows(
Lists.newArrayList(
new TimeWindow(0, 1),
new TimeWindow(1, 2),
new TimeWindow(2, 3),
new TimeWindow(4, 5),
new TimeWindow(5, 6)),
callback);
verify(callback, times(1)).merge(
(Collection<TimeWindow>) argThat(containsInAnyOrder(new TimeWindow(0, 1), new TimeWindow(1, 2), new TimeWindow(2, 3))),
eq(new TimeWindow(0, 3)));
verify(callback, times(1)).merge(
(Collection<TimeWindow>) argThat(containsInAnyOrder(new TimeWindow(4, 5), new TimeWindow(5, 6))),
eq(new TimeWindow(4, 6)));
verify(callback, times(2)).merge(anyCollection(), Matchers.anyObject());
}
@Test
public void testMergeCoveringWindow() {
MergingWindowAssigner.MergeCallback callback = mock(MergingWindowAssigner.MergeCallback.class);
EventTimeSessionWindows assigner = EventTimeSessionWindows.withGap(Time.milliseconds(5000));
assigner.mergeWindows(
Lists.newArrayList(
new TimeWindow(1, 1),
new TimeWindow(0, 2),
new TimeWindow(4, 7),
new TimeWindow(5, 6)),
callback);
verify(callback, times(1)).merge(
(Collection<TimeWindow>) argThat(containsInAnyOrder(new TimeWindow(1, 1), new TimeWindow(0, 2))),
eq(new TimeWindow(0, 2)));
verify(callback, times(1)).merge(
(Collection<TimeWindow>) argThat(containsInAnyOrder(new TimeWindow(5, 6), new TimeWindow(4, 7))),
eq(new TimeWindow(4, 7)));
verify(callback, times(2)).merge(anyCollection(), Matchers.anyObject());
}
@Test
public void testTimeUnits() {
// sanity check with one other time unit
final int SESSION_GAP = 5000;
WindowAssigner.WindowAssignerContext mockContext =
mock(WindowAssigner.WindowAssignerContext.class);
EventTimeSessionWindows assigner = EventTimeSessionWindows.withGap(Time.seconds(SESSION_GAP / 1000));
assertThat(assigner.assignWindows("String", 0L, mockContext), contains(timeWindow(0, 0 + SESSION_GAP)));
assertThat(assigner.assignWindows("String", 4999L, mockContext), contains(timeWindow(4999, 4999 + SESSION_GAP)));
assertThat(assigner.assignWindows("String", 5000L, mockContext), contains(timeWindow(5000, 5000 + SESSION_GAP)));
}
@Test
public void testInvalidParameters() {
try {
EventTimeSessionWindows.withGap(Time.seconds(-1));
fail("should fail");
} catch (IllegalArgumentException e) {
assertThat(e.toString(), containsString("0 < size"));
}
try {
EventTimeSessionWindows.withGap(Time.seconds(0));
fail("should fail");
} catch (IllegalArgumentException e) {
assertThat(e.toString(), containsString("0 < size"));
}
}
@Test
public void testProperties() {
EventTimeSessionWindows assigner = EventTimeSessionWindows.withGap(Time.seconds(5));
assertTrue(assigner.isEventTime());
assertEquals(new TimeWindow.Serializer(), assigner.getWindowSerializer(new ExecutionConfig()));
assertThat(assigner.getDefaultTrigger(mock(StreamExecutionEnvironment.class)), instanceOf(EventTimeTrigger.class));
}
}