Refactor isAppHibernationEnabled check in AppHibernationService

Directly return the static field to avoid querying DeviceConfig
everytime.

Bug: 181183614
Test: atest AppHibernationServiceTest
Test: atest CtsWindowManagerDeviceTestCases:ActivityMetricsLoggerTests
Test: atest CtsStatsdAtomHostTestCases:AppStartStatsTests

Change-Id: Id01a701dadb76655a24effbd9d3ce011d7f2f686

services/core/java/com/android/server/apphibernation/AppHibernationService.java

@@ -109,7 +109,7 @@ public final class AppHibernationService extends SystemService {
     private final boolean mOatArtifactDeletionEnabled;
 
     @VisibleForTesting
-    boolean mIsServiceEnabled;
+    static boolean sIsServiceEnabled;
 
     /**
      * Initializes the system service.
@@ -165,7 +165,7 @@ public final class AppHibernationService extends SystemService {
             });
         }
         if (phase == SystemService.PHASE_SYSTEM_SERVICES_READY) {
-            mIsServiceEnabled = isAppHibernationEnabled();
+            sIsServiceEnabled = isDeviceConfigAppHibernationEnabled();
             DeviceConfig.addOnPropertiesChangedListener(
                     NAMESPACE_APP_HIBERNATION,
                     ActivityThread.currentApplication().getMainExecutor(),
@@ -536,7 +536,7 @@ public final class AppHibernationService extends SystemService {
     private void onDeviceConfigChanged(Properties properties) {
         for (String key : properties.getKeyset()) {
             if (TextUtils.equals(KEY_APP_HIBERNATION_ENABLED, key)) {
-                mIsServiceEnabled = isAppHibernationEnabled();
+                sIsServiceEnabled = isDeviceConfigAppHibernationEnabled();
                 break;
             }
         }
@@ -574,10 +574,10 @@ public final class AppHibernationService extends SystemService {
     }
 
     private boolean checkHibernationEnabled(String methodName) {
-        if (!mIsServiceEnabled) {
+        if (!sIsServiceEnabled) {
             Slog.w(TAG, String.format("Attempted to call %s on unsupported device.", methodName));
         }
-        return mIsServiceEnabled;
+        return sIsServiceEnabled;
     }
 
     private void dump(PrintWriter pw) {
@@ -725,6 +725,10 @@ public final class AppHibernationService extends SystemService {
      * @return true if enabled, false otherwise
      */
     public static boolean isAppHibernationEnabled() {
+        return sIsServiceEnabled;
+    }
+
+    private static boolean isDeviceConfigAppHibernationEnabled() {
         return DeviceConfig.getBoolean(
                 NAMESPACE_APP_HIBERNATION,
                 KEY_APP_HIBERNATION_ENABLED,

services/core/java/com/android/server/wm/ActivityMetricsLogger.java

@@ -167,7 +167,6 @@ class ActivityMetricsLogger {
     @VisibleForTesting static final int LAUNCH_OBSERVER_ACTIVITY_RECORD_PROTO_CHUNK_SIZE = 512;
     private final ArrayMap<String, Boolean> mLastHibernationStates = new ArrayMap<>();
     private AppHibernationManagerInternal mAppHibernationManagerInternal;
-    private boolean mIsAppHibernationEnabled;
 
     /**
      * The information created when an intent is incoming but we do not yet know whether it will be
@@ -796,8 +795,8 @@ class ActivityMetricsLogger {
 
     @Nullable
     private AppHibernationManagerInternal getAppHibernationManagerInternal() {
+        if (!AppHibernationService.isAppHibernationEnabled()) return null;
         if (mAppHibernationManagerInternal == null) {
-            mIsAppHibernationEnabled = AppHibernationService.isAppHibernationEnabled();
             mAppHibernationManagerInternal =
                     LocalServices.getService(AppHibernationManagerInternal.class);
         }
@@ -810,7 +809,7 @@ class ActivityMetricsLogger {
      */
     void notifyBeforePackageUnstopped(@NonNull String packageName) {
         final AppHibernationManagerInternal ahmInternal = getAppHibernationManagerInternal();
-        if (ahmInternal != null && mIsAppHibernationEnabled) {
+        if (ahmInternal != null) {
             mLastHibernationStates.put(packageName, ahmInternal.isHibernatingGlobally(packageName));
         }
     }

services/tests/servicestests/src/com/android/server/apphibernation/AppHibernationServiceTest.java

@@ -123,7 +123,7 @@ public final class AppHibernationServiceTest {
         doReturn(true).when(mUserManager).isUserUnlockingOrUnlocked(USER_ID_1);
         mAppHibernationService.onUserUnlocking(new SystemService.TargetUser(userInfo));
 
-        mAppHibernationService.mIsServiceEnabled = true;
+        mAppHibernationService.sIsServiceEnabled = true;
     }
 
     @Test