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Allow track selection parameters to be set in ExoPlayerAssetLoader.

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PiperOrigin-RevId: 701926949
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Googler 2024-12-02 05:01:26 -08:00 committed by Copybara-Service
parent d214e90ce4
commit 19b276d6a7
9 changed files with 328 additions and 98 deletions
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libraries/test_data/src/test/assets/media/dash/multi-track/chunk-stream0-00001.m4s Normal file
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libraries/test_data/src/test/assets/media/dash/multi-track/init-stream0.m4s Normal file
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libraries/test_data/src/test/assets/media/dash/multi-track/init-stream1.m4s Normal file
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33
libraries/test_data/src/test/assets/media/dash/multi-track/sample.mpd Normal file
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@ -0,0 +1,33 @@
<?xml version="1.0" encoding="utf-8"?>
<MPD xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="urn:mpeg:dash:schema:mpd:2011"
xmlns:xlink="http://www.w3.org/1999/xlink"
xsi:schemaLocation="urn:mpeg:DASH:schema:MPD:2011 http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-DASH_schema_files/DASH-MPD.xsd"
profiles="urn:mpeg:dash:profile:isoff-live:2011"
type="static"
mediaPresentationDuration="PT1.0S"
maxSegmentDuration="PT5.0S"
minBufferTime="PT2.0S">
<ProgramInformation>
</ProgramInformation>
<ServiceDescription id="0">
</ServiceDescription>
<Period id="0" start="PT0.0S">
<AdaptationSet id="0" contentType="video" startWithSAP="1" segmentAlignment="true" bitstreamSwitching="true" frameRate="30000/1001" maxWidth="1080" maxHeight="720" par="3:2" lang="und">
<Representation id="0" mimeType="video/mp4" codecs="avc1.4d400d" bandwidth="300000" width="320" height="240" sar="9:8">
<SegmentTemplate timescale="30000" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startNumber="1">
<SegmentTimeline>
<S t="0" d="30030" />
</SegmentTimeline>
</SegmentTemplate>
</Representation>
<Representation id="1" mimeType="video/mp4" codecs="avc1.42c01e" bandwidth="3000000" width="640" height="360" sar="27:32">
<SegmentTemplate timescale="30000" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startNumber="1">
<SegmentTimeline>
<S t="0" d="30030" />
</SegmentTimeline>
</SegmentTemplate>
</Representation>
</AdaptationSet>
</Period>
</MPD>

1
libraries/transformer/build.gradle
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@ -56,6 +56,7 @@ dependencies {
compileOnly 'com.google.errorprone:error_prone_annotations:' + errorProneVersion
compileOnly 'org.checkerframework:checker-qual:' + checkerframeworkVersion
compileOnly 'org.jetbrains.kotlin:kotlin-annotations-jvm:' + kotlinAnnotationsVersion
testImplementation project(modulePrefix + 'lib-exoplayer-dash')
testImplementation project(modulePrefix + 'test-utils-robolectric')
testImplementation project(modulePrefix + 'test-utils')
testImplementation project(modulePrefix + 'test-data')

43
libraries/transformer/src/main/java/androidx/media3/transformer/DefaultAssetLoaderFactory.java
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@ -34,6 +34,7 @@ import androidx.media3.common.util.Util;
import androidx.media3.datasource.DataSourceBitmapLoader;
import androidx.media3.datasource.DefaultDataSource;
import androidx.media3.exoplayer.source.MediaSource;
import androidx.media3.exoplayer.trackselection.TrackSelector;
import androidx.media3.transformer.AssetLoader.CompositionSettings;
import com.google.common.util.concurrent.MoreExecutors;
import java.util.concurrent.Executors;
@ -56,6 +57,7 @@ public final class DefaultAssetLoaderFactory implements AssetLoader.Factory {
private final Clock clock;
@Nullable private final MediaSource.Factory mediaSourceFactory;
private final BitmapLoader bitmapLoader;
@Nullable private final TrackSelector.Factory trackSelectorFactory;
private AssetLoader.@MonotonicNonNull Factory imageAssetLoaderFactory;
private AssetLoader.@MonotonicNonNull Factory exoPlayerAssetLoaderFactory;
@ -75,10 +77,12 @@ public final class DefaultAssetLoaderFactory implements AssetLoader.Factory {
*/
public DefaultAssetLoaderFactory(
Context context, Codec.DecoderFactory decoderFactory, Clock clock) {
// TODO: b/381519379 - deprecate this constructor and replace with a builder.
this.context = context.getApplicationContext();
this.decoderFactory = decoderFactory;
this.clock = clock;
this.mediaSourceFactory = null;
this.trackSelectorFactory = null;
@Nullable BitmapFactory.Options options = null;
if (Util.SDK_INT >= 26) {
options = new BitmapFactory.Options();
@ -102,11 +106,13 @@ public final class DefaultAssetLoaderFactory implements AssetLoader.Factory {
* @param bitmapLoader The {@link BitmapLoader} to use to load and decode images.
*/
public DefaultAssetLoaderFactory(Context context, BitmapLoader bitmapLoader) {
// TODO: b/381519379 - deprecate this constructor and replace with a builder.
this.context = context.getApplicationContext();
this.bitmapLoader = bitmapLoader;
decoderFactory = new DefaultDecoderFactory.Builder(context).build();
clock = Clock.DEFAULT;
mediaSourceFactory = null;
trackSelectorFactory = null;
}
/**
@ -127,11 +133,43 @@ public final class DefaultAssetLoaderFactory implements AssetLoader.Factory {
Clock clock,
@Nullable MediaSource.Factory mediaSourceFactory,
BitmapLoader bitmapLoader) {
// TODO: b/381519379 - deprecate this constructor and replace with a builder.
this.context = context.getApplicationContext();
this.decoderFactory = decoderFactory;
this.clock = clock;
this.mediaSourceFactory = mediaSourceFactory;
this.bitmapLoader = bitmapLoader;
this.trackSelectorFactory = null;
}
/**
* Creates an instance.
*
* @param context The {@link Context}.
* @param decoderFactory The {@link Codec.DecoderFactory} to use to decode the samples (if
* necessary).
* @param clock The {@link Clock} to use. It should always be {@link Clock#DEFAULT}, except for
* testing.
* @param mediaSourceFactory The {@link MediaSource.Factory} to use to retrieve the samples to
* transform when an {@link ExoPlayerAssetLoader} is used.
* @param bitmapLoader The {@link BitmapLoader} to use to load and decode images.
* @param trackSelectorFactory The {@link TrackSelector.Factory} to use when selecting the track
* to transform.
*/
public DefaultAssetLoaderFactory(
Context context,
Codec.DecoderFactory decoderFactory,
Clock clock,
@Nullable MediaSource.Factory mediaSourceFactory,
BitmapLoader bitmapLoader,
TrackSelector.Factory trackSelectorFactory) {
// TODO: b/381519379 - deprecate this constructor and replace with a builder.
this.context = context.getApplicationContext();
this.decoderFactory = decoderFactory;
this.clock = clock;
this.mediaSourceFactory = mediaSourceFactory;
this.bitmapLoader = bitmapLoader;
this.trackSelectorFactory = trackSelectorFactory;
}
@Override
@ -157,9 +195,8 @@ public final class DefaultAssetLoaderFactory implements AssetLoader.Factory {
}
if (exoPlayerAssetLoaderFactory == null) {
exoPlayerAssetLoaderFactory =
mediaSourceFactory != null
? new ExoPlayerAssetLoader.Factory(context, decoderFactory, clock, mediaSourceFactory)
: new ExoPlayerAssetLoader.Factory(context, decoderFactory, clock);
new ExoPlayerAssetLoader.Factory(
context, decoderFactory, clock, mediaSourceFactory, trackSelectorFactory);
}
return exoPlayerAssetLoaderFactory.createAssetLoader(
editedMediaItem, looper, listener, compositionSettings);

65
libraries/transformer/src/main/java/androidx/media3/transformer/ExoPlayerAssetLoader.java
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@ -53,6 +53,7 @@ import androidx.media3.exoplayer.source.DefaultMediaSourceFactory;
import androidx.media3.exoplayer.source.MediaSource;
import androidx.media3.exoplayer.text.TextOutput;
import androidx.media3.exoplayer.trackselection.DefaultTrackSelector;
import androidx.media3.exoplayer.trackselection.TrackSelector;
import androidx.media3.exoplayer.video.VideoRendererEventListener;
import androidx.media3.extractor.DefaultExtractorsFactory;
import androidx.media3.extractor.mp4.Mp4Extractor;
@ -70,6 +71,7 @@ public final class ExoPlayerAssetLoader implements AssetLoader {
private final Codec.DecoderFactory decoderFactory;
private final Clock clock;
@Nullable private final MediaSource.Factory mediaSourceFactory;
@Nullable private final TrackSelector.Factory trackSelectorFactory;
/**
* Creates an instance using a {@link DefaultMediaSourceFactory}.
@ -81,10 +83,13 @@ public final class ExoPlayerAssetLoader implements AssetLoader {
* testing.
*/
public Factory(Context context, Codec.DecoderFactory decoderFactory, Clock clock) {
this.context = context;
this.decoderFactory = decoderFactory;
this.clock = clock;
this.mediaSourceFactory = null;
// TODO: b/381519379 - deprecate this constructor and replace with a builder.
this(
context,
decoderFactory,
clock,
/* mediaSourceFactory= */ null,
/* trackSelectorFactory= */ null);
}
/**
@ -103,10 +108,35 @@ public final class ExoPlayerAssetLoader implements AssetLoader {
Codec.DecoderFactory decoderFactory,
Clock clock,
MediaSource.Factory mediaSourceFactory) {
// TODO: b/381519379 - deprecate this constructor and replace with a builder.
this(context, decoderFactory, clock, mediaSourceFactory, /* trackSelectorFactory= */ null);
}
/**
* Creates an instance.
*
* @param context The {@link Context}.
* @param decoderFactory The {@link Codec.DecoderFactory} to use to decode the samples (if
* necessary).
* @param clock The {@link Clock} to use. It should always be {@link Clock#DEFAULT}, except for
* testing.
* @param mediaSourceFactory The {@link MediaSource.Factory} to use to retrieve the samples to
* transform.
* @param trackSelectorFactory The {@link TrackSelector.Factory} to use when selecting the track
* to transform.
*/
public Factory(
Context context,
Codec.DecoderFactory decoderFactory,
Clock clock,
@Nullable MediaSource.Factory mediaSourceFactory,
@Nullable TrackSelector.Factory trackSelectorFactory) {
// TODO: b/381519379 - deprecate this constructor and replace with a builder.
this.context = context;
this.decoderFactory = decoderFactory;
this.clock = clock;
this.mediaSourceFactory = mediaSourceFactory;
this.trackSelectorFactory = trackSelectorFactory;
}
@Override
@ -123,6 +153,20 @@ public final class ExoPlayerAssetLoader implements AssetLoader {
}
mediaSourceFactory = new DefaultMediaSourceFactory(context, defaultExtractorsFactory);
}
TrackSelector.Factory trackSelectorFactory = this.trackSelectorFactory;
if (trackSelectorFactory == null) {
DefaultTrackSelector.Parameters defaultTrackSelectorParameters =
new DefaultTrackSelector.Parameters.Builder(context)
.setForceHighestSupportedBitrate(true)
.setConstrainAudioChannelCountToDeviceCapabilities(false)
.build();
trackSelectorFactory =
context -> {
DefaultTrackSelector trackSelector = new DefaultTrackSelector(context);
trackSelector.setParameters(defaultTrackSelectorParameters);
return trackSelector;
};
}
return new ExoPlayerAssetLoader(
context,
editedMediaItem,
@ -131,7 +175,8 @@ public final class ExoPlayerAssetLoader implements AssetLoader {
compositionSettings.hdrMode,
looper,
listener,
clock);
clock,
trackSelectorFactory);
}
}
@ -158,17 +203,13 @@ public final class ExoPlayerAssetLoader implements AssetLoader {
@Composition.HdrMode int hdrMode,
Looper looper,
Listener listener,
Clock clock) {
Clock clock,
TrackSelector.Factory trackSelectorFactory) {
this.context = context;
this.editedMediaItem = editedMediaItem;
this.decoderFactory = new CapturingDecoderFactory(decoderFactory);
DefaultTrackSelector trackSelector = new DefaultTrackSelector(context);
trackSelector.setParameters(
new DefaultTrackSelector.Parameters.Builder(context)
.setForceHighestSupportedBitrate(true)
.setConstrainAudioChannelCountToDeviceCapabilities(false)
.build());
TrackSelector trackSelector = trackSelectorFactory.createTrackSelector(context);
// Arbitrarily decrease buffers for playback so that samples start being sent earlier to the
// exporters (rebuffers are less problematic for the export use case).
DefaultLoadControl loadControl =

284
libraries/transformer/src/test/java/androidx/media3/transformer/ExoPlayerAssetLoaderTest.java
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@ -27,6 +27,8 @@ import androidx.media3.common.Format;
import androidx.media3.common.MediaItem;
import androidx.media3.common.util.Clock;
import androidx.media3.decoder.DecoderInputBuffer;
import androidx.media3.exoplayer.trackselection.DefaultTrackSelector;
import androidx.media3.exoplayer.trackselection.TrackSelector;
import androidx.media3.transformer.AssetLoader.CompositionSettings;
import androidx.test.core.app.ApplicationProvider;
import androidx.test.ext.junit.runners.AndroidJUnit4;
@ -41,91 +43,27 @@ import org.robolectric.shadows.ShadowSystemClock;
@RunWith(AndroidJUnit4.class)
public class ExoPlayerAssetLoaderTest {
private static final String SINGLE_TRACK_URI = "asset:///media/mp4/sample.mp4";
// Contains two representations of asset:///assets/media/dash/ttml-in-mp4/sample.video.mp4
// one at 360p and the other at 240p.
private static final String MULTI_TRACK_URI = "asset:///media/dash/multi-track/sample.mpd";
@Test
public void exoPlayerAssetLoader_callsListenerCallbacksInRightOrder() throws Exception {
AtomicReference<Exception> exceptionRef = new AtomicReference<>();
AtomicReference<Exception> exception = new AtomicReference<>();
AtomicBoolean isAudioOutputFormatSet = new AtomicBoolean();
AtomicBoolean isVideoOutputFormatSet = new AtomicBoolean();
AssetLoader.Listener listener =
new AssetLoader.Listener() {
private volatile boolean isDurationSet;
private volatile boolean isTrackCountSet;
private volatile boolean isAudioTrackAdded;
private volatile boolean isVideoTrackAdded;
@Override
public void onDurationUs(long durationUs) {
// Sleep to increase the chances of the test failing.
sleep();
isDurationSet = true;
}
@Override
public void onTrackCount(int trackCount) {
// Sleep to increase the chances of the test failing.
sleep();
isTrackCountSet = true;
}
@Override
public boolean onTrackAdded(
Format inputFormat, @AssetLoader.SupportedOutputTypes int supportedOutputTypes) {
if (!isDurationSet) {
exceptionRef.set(
new IllegalStateException("onTrackAdded() called before onDurationUs()"));
} else if (!isTrackCountSet) {
exceptionRef.set(
new IllegalStateException("onTrackAdded() called before onTrackCount()"));
}
sleep();
@C.TrackType int trackType = getProcessedTrackType(inputFormat.sampleMimeType);
if (trackType == C.TRACK_TYPE_AUDIO) {
isAudioTrackAdded = true;
} else if (trackType == C.TRACK_TYPE_VIDEO) {
isVideoTrackAdded = true;
}
return false;
}
@Override
public SampleConsumer onOutputFormat(Format format) {
@C.TrackType int trackType = getProcessedTrackType(format.sampleMimeType);
boolean isAudio = trackType == C.TRACK_TYPE_AUDIO;
boolean isVideo = trackType == C.TRACK_TYPE_VIDEO;
boolean isTrackAdded = (isAudio && isAudioTrackAdded) || (isVideo && isVideoTrackAdded);
if (!isTrackAdded) {
exceptionRef.set(
new IllegalStateException("onOutputFormat() called before onTrackAdded()"));
}
if (isAudio) {
isAudioOutputFormatSet.set(true);
} else if (isVideo) {
isVideoOutputFormatSet.set(true);
}
return new FakeSampleConsumer();
}
@Override
public void onError(ExportException e) {
exceptionRef.set(e);
}
private void sleep() {
try {
Thread.sleep(10);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
exceptionRef.set(e);
}
}
};
getAssetLoaderListener(
exception,
isAudioOutputFormatSet,
isVideoOutputFormatSet,
/* expectedOutputResolutionHeight= */ null);
// Use default clock so that messages sent on different threads are not always executed in the
// order in which they are received.
Clock clock = Clock.DEFAULT;
AssetLoader assetLoader = getAssetLoader(listener, clock);
AssetLoader assetLoader =
getAssetLoader(listener, clock, SINGLE_TRACK_URI, /* trackSelectorFactory= */ null);
assetLoader.start();
runLooperUntil(
@ -133,18 +71,109 @@ public class ExoPlayerAssetLoaderTest {
() -> {
ShadowSystemClock.advanceBy(Duration.ofMillis(10));
return (isAudioOutputFormatSet.get() && isVideoOutputFormatSet.get())
|| exceptionRef.get() != null;
|| exception.get() != null;
});
assertThat(exceptionRef.get()).isNull();
assertThat(exception.get()).isNull();
}
private static AssetLoader getAssetLoader(AssetLoader.Listener listener, Clock clock) {
@Test
public void exoPlayerAssetLoader_withMaxVideoSize_loadsLowResolutionTrack() throws Exception {
AtomicReference<Exception> exception = new AtomicReference<>();
AtomicBoolean isAudioOutputFormatSet = new AtomicBoolean();
AtomicBoolean isVideoOutputFormatSet = new AtomicBoolean();
int expectedOutputResolutionHeight = 240;
AssetLoader.Listener listener =
getAssetLoaderListener(
exception,
isAudioOutputFormatSet,
isVideoOutputFormatSet,
expectedOutputResolutionHeight);
DefaultTrackSelector.Parameters trackSelectorParameters =
new DefaultTrackSelector.Parameters.Builder(ApplicationProvider.getApplicationContext())
.setMaxVideoSize(
/* maxVideoWidth= */ Integer.MAX_VALUE,
/* maxVideoHeight= */ expectedOutputResolutionHeight)
.setForceHighestSupportedBitrate(true)
.setConstrainAudioChannelCountToDeviceCapabilities(false)
.build();
TrackSelector.Factory trackSelectorFactory =
context -> {
DefaultTrackSelector trackSelector = new DefaultTrackSelector(context);
trackSelector.setParameters(trackSelectorParameters);
return trackSelector;
};
// Use default clock so that messages sent on different threads are not always executed in the
// order in which they are received.
Clock clock = Clock.DEFAULT;
AssetLoader assetLoader =
getAssetLoader(listener, clock, MULTI_TRACK_URI, trackSelectorFactory);
assetLoader.start();
runLooperUntil(
Looper.myLooper(),
() -> {
ShadowSystemClock.advanceBy(Duration.ofMillis(10));
return isVideoOutputFormatSet.get() || exception.get() != null;
});
// The resolution of the selected track is checked against expectedOutputResolutionHeight in
// listener.onOutputFormat.
assertThat(exception.get()).isNull();
}
@Test
public void exoPlayerAssetLoader_withNoMaxVideoSize_loadsHighResolutionTrack() throws Exception {
AtomicReference<Exception> exception = new AtomicReference<>();
AtomicBoolean isAudioOutputFormatSet = new AtomicBoolean();
AtomicBoolean isVideoOutputFormatSet = new AtomicBoolean();
int expectedOutputResolutionHeight = 360;
AssetLoader.Listener listener =
getAssetLoaderListener(
exception,
isAudioOutputFormatSet,
isVideoOutputFormatSet,
expectedOutputResolutionHeight);
DefaultTrackSelector.Parameters trackSelectorParameters =
new DefaultTrackSelector.Parameters.Builder(ApplicationProvider.getApplicationContext())
.setForceHighestSupportedBitrate(true)
.setConstrainAudioChannelCountToDeviceCapabilities(false)
.build();
TrackSelector.Factory trackSelectorFactory =
context -> {
DefaultTrackSelector trackSelector = new DefaultTrackSelector(context);
trackSelector.setParameters(trackSelectorParameters);
return trackSelector;
};
// Use default clock so that messages sent on different threads are not always executed in the
// order in which they are received.
Clock clock = Clock.DEFAULT;
AssetLoader assetLoader =
getAssetLoader(listener, clock, MULTI_TRACK_URI, trackSelectorFactory);
assetLoader.start();
runLooperUntil(
Looper.myLooper(),
() -> {
ShadowSystemClock.advanceBy(Duration.ofMillis(10));
return isVideoOutputFormatSet.get() || exception.get() != null;
});
// The resolution of the selected track is checked against expectedOutputResolutionHeight in
// listener.onOutputFormat.
assertThat(exception.get()).isNull();
}
private static AssetLoader getAssetLoader(
AssetLoader.Listener listener,
Clock clock,
String uri,
@Nullable TrackSelector.Factory trackSelectorFactory) {
Context context = ApplicationProvider.getApplicationContext();
Codec.DecoderFactory decoderFactory = new DefaultDecoderFactory.Builder(context).build();
EditedMediaItem editedMediaItem =
new EditedMediaItem.Builder(MediaItem.fromUri("asset:///media/mp4/sample.mp4")).build();
return new ExoPlayerAssetLoader.Factory(context, decoderFactory, clock)
EditedMediaItem editedMediaItem = new EditedMediaItem.Builder(MediaItem.fromUri(uri)).build();
return new ExoPlayerAssetLoader.Factory(
context, decoderFactory, clock, /* mediaSourceFactory= */ null, trackSelectorFactory)
.createAssetLoader(
editedMediaItem,
Looper.myLooper(),
@ -153,6 +182,95 @@ public class ExoPlayerAssetLoaderTest {
Composition.HDR_MODE_KEEP_HDR, /* retainHdrFromUltraHdrImage= */ false));
}
private static AssetLoader.Listener getAssetLoaderListener(
AtomicReference<Exception> exceptionRef,
AtomicBoolean isAudioOutputFormatSet,
AtomicBoolean isVideoOutputFormatSet,
@Nullable Integer expectedOutputResolutionHeight) {
return new AssetLoader.Listener() {
private volatile boolean isDurationSet;
private volatile boolean isTrackCountSet;
private volatile boolean isAudioTrackAdded;
private volatile boolean isVideoTrackAdded;
@Override
public void onDurationUs(long durationUs) {
// Sleep to increase the chances of the test failing.
sleep();
isDurationSet = true;
}
@Override
public void onTrackCount(int trackCount) {
// Sleep to increase the chances of the test failing.
sleep();
isTrackCountSet = true;
}
@Override
public boolean onTrackAdded(
Format inputFormat, @AssetLoader.SupportedOutputTypes int supportedOutputTypes) {
if (!isDurationSet) {
exceptionRef.set(
new IllegalStateException("onTrackAdded() called before onDurationUs()"));
} else if (!isTrackCountSet) {
exceptionRef.set(
new IllegalStateException("onTrackAdded() called before onTrackCount()"));
}
sleep();
@C.TrackType int trackType = getProcessedTrackType(inputFormat.sampleMimeType);
if (trackType == C.TRACK_TYPE_AUDIO) {
isAudioTrackAdded = true;
} else if (trackType == C.TRACK_TYPE_VIDEO) {
isVideoTrackAdded = true;
}
return false;
}
@Override
public SampleConsumer onOutputFormat(Format format) {
@C.TrackType int trackType = getProcessedTrackType(format.sampleMimeType);
boolean isAudio = trackType == C.TRACK_TYPE_AUDIO;
boolean isVideo = trackType == C.TRACK_TYPE_VIDEO;
boolean isTrackAdded = (isAudio && isAudioTrackAdded) || (isVideo && isVideoTrackAdded);
if (!isTrackAdded) {
exceptionRef.set(
new IllegalStateException("onOutputFormat() called before onTrackAdded()"));
}
if (isAudio) {
isAudioOutputFormatSet.set(true);
} else if (isVideo) {
if (expectedOutputResolutionHeight != null
&& expectedOutputResolutionHeight != format.height) {
exceptionRef.set(
new IllegalStateException(
String.format(
"Expected output height %s but received output height %s.",
expectedOutputResolutionHeight, format.height)));
}
isVideoOutputFormatSet.set(true);
}
return new FakeSampleConsumer();
}
@Override
public void onError(ExportException e) {
exceptionRef.set(e);
}
private void sleep() {
try {
Thread.sleep(10);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
exceptionRef.set(e);
}
}
};
}
private static final class FakeSampleConsumer implements SampleConsumer {
@Nullable