App Standby : Association between content providers and their sync adapter

Set sync adapters to active if the associated content providers are used
at foreground process state.

Minimize how frequently published content providers are reported by
keeping track of last reported time.

Also cache sync adapters associated with an authority in SyncManager.

Bug: 21785111
Change-Id: Ic2c8cb6a27f005d1a1d0aad21d36b1510160753a

1 files changed, 10 insertions, 2 deletions

diff --git a/core/java/android/content/pm/RegisteredServicesCache.java b/core/java/android/content/pm/RegisteredServicesCache.java
index 0bd2a3b..b293e2a 100644
--- a/core/java/android/content/pm/RegisteredServicesCache.java
+++ b/core/java/android/content/pm/RegisteredServicesCache.java
@@ -84,7 +84,7 @@ public abstract class RegisteredServicesCache<V> {
     private final String mAttributesName;
     private final XmlSerializerAndParser<V> mSerializerAndParser;
 
-    private final Object mServicesLock = new Object();
+    protected final Object mServicesLock = new Object();
 
     @GuardedBy("mServicesLock")
     private final SparseArray<UserServices<V>> mUserServices = new SparseArray<UserServices<V>>(2);
@@ -232,6 +232,7 @@ public abstract class RegisteredServicesCache<V> {
         synchronized (mServicesLock) {
             final UserServices<V> user = findOrCreateUserLocked(userId);
             user.services = null;
+            onServicesChangedLocked(userId);
         }
     }
 
@@ -489,11 +490,16 @@ public abstract class RegisteredServicesCache<V> {
                 }
             }
             if (changed) {
+                onServicesChangedLocked(userId);
                 writePersistentServicesLocked(user, userId);
             }
         }
     }
 
+    protected void onServicesChangedLocked(int userId) {
+        // Feel free to override
+    }
+
     /**
      * Returns true if the list of changed uids is null (wildcard) or the specified uid
      * is contained in the list of changed uids.
@@ -687,7 +693,9 @@ public abstract class RegisteredServicesCache<V> {
 
     @VisibleForTesting
     protected void onUserRemoved(int userId) {
-        mUserServices.remove(userId);
+        synchronized (mServicesLock) {
+            mUserServices.remove(userId);
+        }
     }
 
     @VisibleForTesting