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Fix slow and frozen frames tracking #2271

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merged 8 commits into from
Oct 5, 2022
Merged

Fix slow and frozen frames tracking #2271

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343ada1
Snapshot frames onActivityStarted and on transaction finish then calc…
adinauer Oct 3, 2022
6044b4c
Add changelog
adinauer Oct 3, 2022
2f4462c
Add tests
adinauer Oct 3, 2022
f6b0dc7
Add final keyword
adinauer Oct 3, 2022
4f2ca28
Update sentry-android-core/src/main/java/io/sentry/android/core/Activ…
adinauer Oct 4, 2022
8cab3eb
Update sentry-android-core/src/test/java/io/sentry/android/core/Activ…
adinauer Oct 4, 2022
391ea57
Update sentry-android-core/src/test/java/io/sentry/android/core/Activ…
adinauer Oct 4, 2022
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adinauer Oct 4, 2022
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4 changes: 4 additions & 0 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
@@ -1,5 +1,9 @@
# Changelog

## Unreleased

- Fix slow and frozen frames tracking ([#2271](https://github.com/getsentry/sentry-java/pull/2271))
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@marandaneto since no public API changes were necessary I assume this fix doesn't require any further action on hybrid SDKs.


## 6.4.2

### Fixes
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105 changes: 83 additions & 22 deletions sentry-android-core/src/main/java/io/sentry/android/core/ActivityFramesTracker.java
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Expand Up @@ -10,6 +10,7 @@
import io.sentry.protocol.SentryId;
import java.util.HashMap;
import java.util.Map;
import java.util.WeakHashMap;
import java.util.concurrent.ConcurrentHashMap;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
Expand All @@ -27,6 +28,8 @@ public final class ActivityFramesTracker {

private final @NotNull Map<SentryId, Map<String, @NotNull MeasurementValue>>
activityMeasurements = new ConcurrentHashMap<>();
private final @NotNull Map<Activity, FrameCounts> frameCountAtStartSnapshots =
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I like the name 👏

new WeakHashMap<>();

public ActivityFramesTracker(final @NotNull LoadClass loadClass, final @Nullable ILogger logger) {
androidXAvailable =
Expand Down Expand Up @@ -55,33 +58,50 @@ public synchronized void addActivity(final @NotNull Activity activity) {
return;
}
frameMetricsAggregator.add(activity);
snapshotFrameCountsAtStart(activity);
}

@SuppressWarnings("NullAway")
public synchronized void setMetrics(
final @NotNull Activity activity, final @NotNull SentryId sentryId) {
private void snapshotFrameCountsAtStart(final @NotNull Activity activity) {
FrameCounts frameCounts = calculateCurrentFrameCounts();
if (frameCounts != null) {
frameCountAtStartSnapshots.put(activity, frameCounts);
}
}

private @Nullable FrameCounts diffFrameCountsAtEnd(final @NotNull Activity activity) {
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l: I would move this method below setMetrics, because it is the only function calling this method. Now when I read setMetrics I have to jump all the way up to here to find the method. Keeping functions calling each other close to each other in the code improves readability, IMO.

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Thanks, forgot to reorder them

@Nullable
final FrameCounts frameCountsAtStartFromMap = frameCountAtStartSnapshots.remove(activity);
@NotNull
final FrameCounts frameCountsAtStart =
frameCountsAtStartFromMap == null ? new FrameCounts(0, 0, 0) : frameCountsAtStartFromMap;
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m: When do we run into this edge case that the frameCountsAtStartFromMap is null? We already check that the activity is not null here

sentry-java/sentry-android-core/src/main/java/io/sentry/android/core/ActivityLifecycleIntegration.java

Lines 169 to 172 in f6b0dc7

@Nullable Activity unwrappedActivity = weakActivity.get();
if (unwrappedActivity != null) {
activityFramesTracker.setMetrics(
unwrappedActivity, finishingTransaction.getEventId());

The parameter is also annotated @NotNull. If this happens, something is wrong and I think we should better not count the frames at all and return null here. If we use FrameCounts(0, 0, 0), I think we risk calculating incorrect frame counts.

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My idea here was that we might not be able to determine frame counts if the FrameMetricsAggregator was freshly created as getMetrics() on it is marked with @Nullable. Since I changed some code around it shouldn't be necessary as we have a FrameCounts(0, 0, 0). Gonna change it so it doesn't calculate a difference if it can't find a start snapshot.


@Nullable final FrameCounts frameCountsAtEnd = calculateCurrentFrameCounts();
if (frameCountsAtEnd == null) {
return null;
}

final int diffTotalFrames = frameCountsAtEnd.totalFrames - frameCountsAtStart.totalFrames;
final int diffSlowFrames = frameCountsAtEnd.slowFrames - frameCountsAtStart.slowFrames;
final int diffFrozenFrames = frameCountsAtEnd.frozenFrames - frameCountsAtStart.frozenFrames;

return new FrameCounts(diffTotalFrames, diffSlowFrames, diffFrozenFrames);
}

private @Nullable FrameCounts calculateCurrentFrameCounts() {
if (!isFrameMetricsAggregatorAvailable()) {
return;
return null;
}

if (frameMetricsAggregator == null) {
return null;
}
final @Nullable SparseIntArray[] framesRates = frameMetricsAggregator.getMetrics();

int totalFrames = 0;
int slowFrames = 0;
int frozenFrames = 0;

SparseIntArray[] framesRates = null;
try {
framesRates = frameMetricsAggregator.remove(activity);
} catch (Throwable ignored) {
// throws IllegalArgumentException when attempting to remove OnFrameMetricsAvailableListener
// that was never added.
// there's no contains method.
// throws NullPointerException when attempting to remove OnFrameMetricsAvailableListener and
// there was no
// Observers, See
// https://android.googlesource.com/platform/frameworks/base/+/140ff5ea8e2d99edc3fbe63a43239e459334c76b
}

if (framesRates != null) {
if (framesRates != null && framesRates.length > 0) {
final SparseIntArray totalIndexArray = framesRates[FrameMetricsAggregator.TOTAL_INDEX];
if (totalIndexArray != null) {
for (int i = 0; i < totalIndexArray.size(); i++) {
Expand All @@ -100,13 +120,53 @@ public synchronized void setMetrics(
}
}

if (totalFrames == 0 && slowFrames == 0 && frozenFrames == 0) {
return new FrameCounts(totalFrames, slowFrames, frozenFrames);
}

private static final class FrameCounts {
private final int totalFrames;
private final int slowFrames;
private final int frozenFrames;

private FrameCounts(final int totalFrames, final int slowFrames, final int frozenFrames) {
this.totalFrames = totalFrames;
this.slowFrames = slowFrames;
this.frozenFrames = frozenFrames;
}
}

@SuppressWarnings("NullAway")
public synchronized void setMetrics(
final @NotNull Activity activity, final @NotNull SentryId sentryId) {
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if (!isFrameMetricsAggregatorAvailable()) {
return;
}

try {
// NOTE: removing an activity does not reset the frame counts, only reset() does
frameMetricsAggregator.remove(activity);
} catch (Throwable ignored) {
// throws IllegalArgumentException when attempting to remove OnFrameMetricsAvailableListener
// that was never added.
// there's no contains method.
// throws NullPointerException when attempting to remove OnFrameMetricsAvailableListener and
// there was no
// Observers, See
// https://android.googlesource.com/platform/frameworks/base/+/140ff5ea8e2d99edc3fbe63a43239e459334c76b
}

final @Nullable FrameCounts frameCounts = diffFrameCountsAtEnd(activity);

if (frameCounts == null
|| (frameCounts.totalFrames == 0
&& frameCounts.slowFrames == 0
&& frameCounts.frozenFrames == 0)) {
return;
}

final MeasurementValue tfValues = new MeasurementValue(totalFrames, NONE_UNIT);
final MeasurementValue sfValues = new MeasurementValue(slowFrames, NONE_UNIT);
final MeasurementValue ffValues = new MeasurementValue(frozenFrames, NONE_UNIT);
final MeasurementValue tfValues = new MeasurementValue(frameCounts.totalFrames, NONE_UNIT);
final MeasurementValue sfValues = new MeasurementValue(frameCounts.slowFrames, NONE_UNIT);
final MeasurementValue ffValues = new MeasurementValue(frameCounts.frozenFrames, NONE_UNIT);
final Map<String, @NotNull MeasurementValue> measurements = new HashMap<>();
measurements.put("frames_total", tfValues);
measurements.put("frames_slow", sfValues);
Expand All @@ -132,6 +192,7 @@ public synchronized void setMetrics(
public synchronized void stop() {
if (isFrameMetricsAggregatorAvailable()) {
frameMetricsAggregator.stop();
frameMetricsAggregator.reset();
}
activityMeasurements.clear();
}
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