/
ListenerSetTest.java
422 lines (371 loc) · 16.4 KB
/
ListenerSetTest.java
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/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed 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 com.google.android.exoplayer2.util;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.spy;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.verifyNoMoreInteractions;
import android.os.Looper;
import androidx.test.ext.junit.runners.AndroidJUnit4;
import com.google.android.exoplayer2.C;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.InOrder;
import org.mockito.Mockito;
import org.robolectric.shadows.ShadowLooper;
/** Unit test for {@link ListenerSet}. */
@RunWith(AndroidJUnit4.class)
public class ListenerSetTest {
private static final int EVENT_ID_1 = 0;
private static final int EVENT_ID_2 = 1;
private static final int EVENT_ID_3 = 2;
@Test
public void queueEvent_withoutFlush_sendsNoEvents() {
ListenerSet<TestListener> listenerSet =
new ListenerSet<>(Looper.myLooper(), Clock.DEFAULT, TestListener::iterationFinished);
TestListener listener = mock(TestListener.class);
listenerSet.add(listener);
listenerSet.queueEvent(EVENT_ID_1, TestListener::callback1);
listenerSet.queueEvent(EVENT_ID_2, TestListener::callback2);
ShadowLooper.idleMainLooper();
verifyNoMoreInteractions(listener);
}
@Test
public void flushEvents_sendsPreviouslyQueuedEventsToAllListeners() {
ListenerSet<TestListener> listenerSet =
new ListenerSet<>(Looper.myLooper(), Clock.DEFAULT, TestListener::iterationFinished);
TestListener listener1 = mock(TestListener.class);
TestListener listener2 = mock(TestListener.class);
listenerSet.add(listener1);
listenerSet.add(listener2);
listenerSet.queueEvent(EVENT_ID_1, TestListener::callback1);
listenerSet.queueEvent(EVENT_ID_2, TestListener::callback2);
listenerSet.queueEvent(EVENT_ID_1, TestListener::callback1);
listenerSet.flushEvents();
ShadowLooper.idleMainLooper();
InOrder inOrder = Mockito.inOrder(listener1, listener2);
inOrder.verify(listener1).callback1();
inOrder.verify(listener2).callback1();
inOrder.verify(listener1).callback2();
inOrder.verify(listener2).callback2();
inOrder.verify(listener1).callback1();
inOrder.verify(listener2).callback1();
inOrder.verify(listener1).iterationFinished(createFlagSet(EVENT_ID_1, EVENT_ID_2));
inOrder.verify(listener2).iterationFinished(createFlagSet(EVENT_ID_1, EVENT_ID_2));
inOrder.verifyNoMoreInteractions();
}
@Test
public void flushEvents_recursive_sendsEventsInCorrectOrder() {
ListenerSet<TestListener> listenerSet =
new ListenerSet<>(Looper.myLooper(), Clock.DEFAULT, TestListener::iterationFinished);
// Listener1 sends callback3 recursively when receiving callback1.
TestListener listener1 =
spy(
new TestListener() {
@Override
public void callback1() {
listenerSet.queueEvent(EVENT_ID_3, TestListener::callback3);
listenerSet.flushEvents();
}
});
TestListener listener2 = mock(TestListener.class);
listenerSet.add(listener1);
listenerSet.add(listener2);
listenerSet.queueEvent(EVENT_ID_1, TestListener::callback1);
listenerSet.queueEvent(EVENT_ID_2, TestListener::callback2);
listenerSet.flushEvents();
ShadowLooper.idleMainLooper();
InOrder inOrder = Mockito.inOrder(listener1, listener2);
inOrder.verify(listener1).callback1();
inOrder.verify(listener2).callback1();
inOrder.verify(listener1).callback2();
inOrder.verify(listener2).callback2();
inOrder.verify(listener1).callback3();
inOrder.verify(listener2).callback3();
inOrder.verify(listener1).iterationFinished(createFlagSet(EVENT_ID_1, EVENT_ID_2, EVENT_ID_3));
inOrder.verify(listener2).iterationFinished(createFlagSet(EVENT_ID_1, EVENT_ID_2, EVENT_ID_3));
inOrder.verifyNoMoreInteractions();
}
@Test
public void
flushEvents_withMultipleMessageQueueIterations_sendsIterationFinishedEventPerIteration() {
ListenerSet<TestListener> listenerSet =
new ListenerSet<>(Looper.myLooper(), Clock.DEFAULT, TestListener::iterationFinished);
// Listener1 sends callback1 recursively when receiving callback3.
TestListener listener1 =
spy(
new TestListener() {
@Override
public void callback3() {
listenerSet.sendEvent(EVENT_ID_1, TestListener::callback1);
}
});
TestListener listener2 = mock(TestListener.class);
listenerSet.add(listener1);
listenerSet.add(listener2);
// Iteration with single flush.
listenerSet.queueEvent(EVENT_ID_2, TestListener::callback2);
listenerSet.flushEvents();
ShadowLooper.idleMainLooper();
// Iteration with multiple flushes.
listenerSet.queueEvent(EVENT_ID_1, TestListener::callback1);
listenerSet.queueEvent(EVENT_ID_2, TestListener::callback2);
listenerSet.flushEvents();
listenerSet.queueEvent(EVENT_ID_1, TestListener::callback1);
listenerSet.flushEvents();
ShadowLooper.idleMainLooper();
// Iteration with recursive call.
listenerSet.sendEvent(EVENT_ID_3, TestListener::callback3);
ShadowLooper.idleMainLooper();
InOrder inOrder = Mockito.inOrder(listener1, listener2);
inOrder.verify(listener1).callback2();
inOrder.verify(listener2).callback2();
inOrder.verify(listener1).iterationFinished(createFlagSet(EVENT_ID_2));
inOrder.verify(listener2).iterationFinished(createFlagSet(EVENT_ID_2));
inOrder.verify(listener1).callback1();
inOrder.verify(listener2).callback1();
inOrder.verify(listener1).callback2();
inOrder.verify(listener2).callback2();
inOrder.verify(listener1).callback1();
inOrder.verify(listener2).callback1();
inOrder.verify(listener1).iterationFinished(createFlagSet(EVENT_ID_1, EVENT_ID_2));
inOrder.verify(listener2).iterationFinished(createFlagSet(EVENT_ID_1, EVENT_ID_2));
inOrder.verify(listener1).callback3();
inOrder.verify(listener2).callback3();
inOrder.verify(listener1).callback1();
inOrder.verify(listener2).callback1();
inOrder.verify(listener1).iterationFinished(createFlagSet(EVENT_ID_1, EVENT_ID_3));
inOrder.verify(listener2).iterationFinished(createFlagSet(EVENT_ID_1, EVENT_ID_3));
inOrder.verifyNoMoreInteractions();
}
@Test
public void flushEvents_calledFromIterationFinishedCallback_restartsIterationFinishedEvents() {
ListenerSet<TestListener> listenerSet =
new ListenerSet<>(Looper.myLooper(), Clock.DEFAULT, TestListener::iterationFinished);
// Listener2 sends callback1 recursively when receiving the iteration finished event.
TestListener listener2 =
spy(
new TestListener() {
boolean eventSent;
@Override
public void iterationFinished(FlagSet flags) {
if (!eventSent) {
listenerSet.sendEvent(EVENT_ID_1, TestListener::callback1);
eventSent = true;
}
}
});
TestListener listener1 = mock(TestListener.class);
TestListener listener3 = mock(TestListener.class);
listenerSet.add(listener1);
listenerSet.add(listener2);
listenerSet.add(listener3);
listenerSet.sendEvent(EVENT_ID_2, TestListener::callback2);
ShadowLooper.idleMainLooper();
InOrder inOrder = Mockito.inOrder(listener1, listener2, listener3);
inOrder.verify(listener1).callback2();
inOrder.verify(listener2).callback2();
inOrder.verify(listener3).callback2();
inOrder.verify(listener1).iterationFinished(createFlagSet(EVENT_ID_2));
inOrder.verify(listener2).iterationFinished(createFlagSet(EVENT_ID_2));
inOrder.verify(listener1).callback1();
inOrder.verify(listener2).callback1();
inOrder.verify(listener3).callback1();
inOrder.verify(listener1).iterationFinished(createFlagSet(EVENT_ID_1));
inOrder.verify(listener2).iterationFinished(createFlagSet(EVENT_ID_1));
inOrder.verify(listener3).iterationFinished(createFlagSet(EVENT_ID_1, EVENT_ID_2));
inOrder.verifyNoMoreInteractions();
}
@Test
public void flushEvents_withUnsetEventFlag_doesNotThrow() {
ListenerSet<TestListener> listenerSet =
new ListenerSet<>(Looper.myLooper(), Clock.DEFAULT, TestListener::iterationFinished);
listenerSet.queueEvent(/* eventFlag= */ C.INDEX_UNSET, TestListener::callback1);
listenerSet.flushEvents();
ShadowLooper.idleMainLooper();
// Asserts that negative event flag (INDEX_UNSET) can be used without throwing.
}
@Test
public void add_withRecursion_onlyReceivesUpdatesForFutureEvents() {
ListenerSet<TestListener> listenerSet =
new ListenerSet<>(Looper.myLooper(), Clock.DEFAULT, TestListener::iterationFinished);
TestListener listener2 = mock(TestListener.class);
// Listener1 adds listener2 recursively.
TestListener listener1 =
spy(
new TestListener() {
@Override
public void callback1() {
listenerSet.add(listener2);
}
});
listenerSet.sendEvent(EVENT_ID_1, TestListener::callback1);
listenerSet.add(listener1);
// This should add listener2, but the event should not be received yet as it happened before
// listener2 was added.
listenerSet.sendEvent(EVENT_ID_1, TestListener::callback1);
listenerSet.sendEvent(EVENT_ID_2, TestListener::callback2);
ShadowLooper.idleMainLooper();
InOrder inOrder = Mockito.inOrder(listener1, listener2);
inOrder.verify(listener1).callback1();
inOrder.verify(listener1).callback2();
inOrder.verify(listener2).callback2();
inOrder.verify(listener1).iterationFinished(createFlagSet(EVENT_ID_1, EVENT_ID_2));
inOrder.verify(listener2).iterationFinished(createFlagSet(EVENT_ID_2));
inOrder.verifyNoMoreInteractions();
}
@Test
public void add_withQueueing_onlyReceivesUpdatesForFutureEvents() {
ListenerSet<TestListener> listenerSet =
new ListenerSet<>(Looper.myLooper(), Clock.DEFAULT, TestListener::iterationFinished);
TestListener listener1 = mock(TestListener.class);
TestListener listener2 = mock(TestListener.class);
// This event is flushed after listener2 was added, but shouldn't be sent to listener2 because
// the event itself occurred before the listener was added.
listenerSet.add(listener1);
listenerSet.queueEvent(EVENT_ID_1, TestListener::callback1);
listenerSet.add(listener2);
listenerSet.queueEvent(EVENT_ID_2, TestListener::callback2);
listenerSet.flushEvents();
ShadowLooper.idleMainLooper();
InOrder inOrder = Mockito.inOrder(listener1, listener2);
inOrder.verify(listener1).callback1();
inOrder.verify(listener1).callback2();
inOrder.verify(listener2).callback2();
inOrder.verify(listener1).iterationFinished(createFlagSet(EVENT_ID_1, EVENT_ID_2));
inOrder.verify(listener2).iterationFinished(createFlagSet(EVENT_ID_2));
inOrder.verifyNoMoreInteractions();
}
@Test
public void remove_withRecursion_stopsReceivingEventsImmediately() {
ListenerSet<TestListener> listenerSet =
new ListenerSet<>(Looper.myLooper(), Clock.DEFAULT, TestListener::iterationFinished);
TestListener listener2 = mock(TestListener.class);
// Listener1 removes listener2 recursively.
TestListener listener1 =
spy(
new TestListener() {
@Override
public void callback1() {
listenerSet.remove(listener2);
}
});
listenerSet.add(listener1);
listenerSet.add(listener2);
// Listener2 shouldn't even get this event as it's removed before the event can be invoked.
listenerSet.sendEvent(EVENT_ID_1, TestListener::callback1);
listenerSet.remove(listener1);
listenerSet.sendEvent(EVENT_ID_2, TestListener::callback2);
ShadowLooper.idleMainLooper();
verify(listener1).callback1();
verify(listener1).iterationFinished(createFlagSet(EVENT_ID_1));
verifyNoMoreInteractions(listener1, listener2);
}
@Test
public void remove_withQueueing_stopsReceivingEventsImmediately() {
ListenerSet<TestListener> listenerSet =
new ListenerSet<>(Looper.myLooper(), Clock.DEFAULT, TestListener::iterationFinished);
TestListener listener1 = mock(TestListener.class);
TestListener listener2 = mock(TestListener.class);
listenerSet.add(listener1);
listenerSet.add(listener2);
// Listener1 shouldn't even get this event as it's removed before the event can be invoked.
listenerSet.queueEvent(EVENT_ID_1, TestListener::callback1);
listenerSet.remove(listener1);
listenerSet.queueEvent(EVENT_ID_1, TestListener::callback1);
listenerSet.flushEvents();
ShadowLooper.idleMainLooper();
verify(listener2, times(2)).callback1();
verify(listener2).iterationFinished(createFlagSet(EVENT_ID_1));
verifyNoMoreInteractions(listener1, listener2);
}
@Test
public void release_stopsForwardingEventsImmediately() {
ListenerSet<TestListener> listenerSet =
new ListenerSet<>(Looper.myLooper(), Clock.DEFAULT, TestListener::iterationFinished);
TestListener listener2 = mock(TestListener.class);
// Listener1 releases the set from within the callback.
TestListener listener1 =
spy(
new TestListener() {
@Override
public void callback1() {
listenerSet.release();
}
});
listenerSet.add(listener1);
listenerSet.add(listener2);
// Listener2 shouldn't even get this event as it's released before the event can be invoked.
listenerSet.sendEvent(EVENT_ID_1, TestListener::callback1);
listenerSet.sendEvent(EVENT_ID_2, TestListener::callback2);
ShadowLooper.idleMainLooper();
verify(listener1).callback1();
verify(listener1).iterationFinished(createFlagSet(EVENT_ID_1));
verifyNoMoreInteractions(listener1, listener2);
}
@Test
public void remove_withRecursionDuringRelease_callsAllPendingEventsAndIterationFinished() {
ListenerSet<TestListener> listenerSet =
new ListenerSet<>(Looper.myLooper(), Clock.DEFAULT, TestListener::iterationFinished);
TestListener listener2 = mock(TestListener.class);
// Listener1 removes Listener2 from within the callback triggered by release().
TestListener listener1 =
spy(
new TestListener() {
@Override
public void iterationFinished(FlagSet flags) {
listenerSet.remove(listener2);
}
});
listenerSet.add(listener1);
listenerSet.add(listener2);
// Listener2 should still get the event and iterationFinished callback because it was triggered
// before the release and the listener removal.
listenerSet.sendEvent(EVENT_ID_1, TestListener::callback1);
listenerSet.release();
ShadowLooper.idleMainLooper();
verify(listener1).callback1();
verify(listener1).iterationFinished(createFlagSet(EVENT_ID_1));
verify(listener2).callback1();
verify(listener2).iterationFinished(createFlagSet(EVENT_ID_1));
verifyNoMoreInteractions(listener1, listener2);
}
@Test
public void release_preventsRegisteringNewListeners() {
ListenerSet<TestListener> listenerSet =
new ListenerSet<>(Looper.myLooper(), Clock.DEFAULT, TestListener::iterationFinished);
TestListener listener = mock(TestListener.class);
listenerSet.release();
listenerSet.add(listener);
listenerSet.sendEvent(EVENT_ID_1, TestListener::callback1);
verify(listener, never()).callback1();
}
private interface TestListener {
default void callback1() {}
default void callback2() {}
default void callback3() {}
default void iterationFinished(FlagSet flags) {}
}
private static FlagSet createFlagSet(int... flagValues) {
FlagSet.Builder flagsBuilder = new FlagSet.Builder();
for (int value : flagValues) {
flagsBuilder.add(value);
}
return flagsBuilder.build();
}
}