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Cache result from VibratorService.hasVibrator in SystemVibrator

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The existing implementation of performHapticFeedback in
PhoneWindowManager uses both hasVibrator and vibrate methods from
Vibrator class. The implementation of VibratorService.hasVibrator is
already constant, returning true if the device has a built in vibrator.

This adds a cache for this value to SystemVibrator, to avoid binder
calls to system_server after the first one.

Bug: 170127981
Test: manual
Change-Id: I68934a41068f4388449321d08a42d8bf890ea91e
This commit is contained in:
Lais Andrade
2021-01-19 17:13:45 +00:00
parent ee605b6465
commit e69b5f4177
1 changed files with 24 additions and 7 deletions
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31
core/java/android/os/SystemVibrator.java
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@@ -17,6 +17,7 @@
package android.os;
import android.annotation.CallbackExecutor;
import android.annotation.IntDef;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.compat.annotation.UnsupportedAppUsage;
@@ -27,6 +28,8 @@ import android.util.Log;
import com.android.internal.annotations.GuardedBy;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.util.Objects;
import java.util.concurrent.Executor;
@@ -38,6 +41,14 @@ import java.util.concurrent.Executor;
public class SystemVibrator extends Vibrator {
private static final String TAG = "Vibrator";
private static final int VIBRATOR_PRESENT_UNKNOWN = 0;
private static final int VIBRATOR_PRESENT_YES = 1;
private static final int VIBRATOR_PRESENT_NO = 2;
@Retention(RetentionPolicy.SOURCE)
@IntDef({VIBRATOR_PRESENT_UNKNOWN, VIBRATOR_PRESENT_YES, VIBRATOR_PRESENT_NO})
private @interface VibratorPresent {}
private final IVibratorService mService;
private final IVibratorManagerService mManagerService;
private final Object mLock = new Object();
@@ -45,6 +56,9 @@ public class SystemVibrator extends Vibrator {
private final Context mContext;
@GuardedBy("mLock")
private VibratorInfo mVibratorInfo;
@GuardedBy("mLock")
@VibratorPresent
private int mVibratorPresent;
@GuardedBy("mDelegates")
private final ArrayMap<OnVibratorStateChangedListener,
@@ -69,15 +83,18 @@ public class SystemVibrator extends Vibrator {
@Override
public boolean hasVibrator() {
if (mService == null) {
Log.w(TAG, "Failed to vibrate; no vibrator service.");
try {
synchronized (mLock) {
if (mVibratorPresent == VIBRATOR_PRESENT_UNKNOWN && mService != null) {
mVibratorPresent =
mService.hasVibrator() ? VIBRATOR_PRESENT_YES : VIBRATOR_PRESENT_NO;
}
return mVibratorPresent == VIBRATOR_PRESENT_YES;
}
} catch (RemoteException e) {
Log.w(TAG, "Failed to query vibrator presence", e);
return false;
}
try {
return mService.hasVibrator();
} catch (RemoteException e) {
}
return false;
}
/**