Creating a cache of users to avoid multiple calls to UserManager

Bug: 22805101
Change-Id: I9cd270efd74fdd34a7eb738fc25797e6f1bf2487

1 files changed, 19 insertions, 6 deletions

diff --git a/src/com/android/launcher3/compat/UserManagerCompat.java b/src/com/android/launcher3/compat/UserManagerCompat.java
index a79d94646..2ff1e7b74 100644
--- a/src/com/android/launcher3/compat/UserManagerCompat.java
+++ b/src/com/android/launcher3/compat/UserManagerCompat.java
@@ -28,16 +28,29 @@ public abstract class UserManagerCompat {
     protected UserManagerCompat() {
     }
 
+    private static final Object sInstanceLock = new Object();
+    private static UserManagerCompat sInstance;
+
     public static UserManagerCompat getInstance(Context context) {
-        if (Utilities.isLmpOrAbove()) {
-            return new UserManagerCompatVL(context);
-        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
-            return new UserManagerCompatV17(context);
-        } else {
-            return new UserManagerCompatV16();
+        synchronized (sInstanceLock) {
+            if (sInstance == null) {
+                if (Utilities.isLmpOrAbove()) {
+                    sInstance = new UserManagerCompatVL(context.getApplicationContext());
+                } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
+                    sInstance = new UserManagerCompatV17(context.getApplicationContext());
+                } else {
+                    sInstance = new UserManagerCompatV16();
+                }
+            }
+            return sInstance;
         }
     }
 
+    /**
+     * Creates a cache for users.
+     */
+    public abstract void enableAndResetCache();
+
     public abstract List<UserHandleCompat> getUserProfiles();
     public abstract long getSerialNumberForUser(UserHandleCompat user);
     public abstract UserHandleCompat getUserForSerialNumber(long serialNumber);