/**
     * Notify observers of a particular user's view of the provider.
     * @param userHandle the user whose view of the provider is to be notified.  May be
     *     the calling user without requiring any permission, otherwise the caller needs to
     *     hold the INTERACT_ACROSS_USERS_FULL permission.  Pseudousers USER_ALL and
     *     USER_CURRENT are properly interpreted; no other pseudousers are allowed.
     */
    @Override
    public void notifyChange(Uri uri, IContentObserver observer,
            boolean observerWantsSelfNotifications, boolean syncToNetwork,
            int userHandle) {
        if (Log.isLoggable(TAG, Log.VERBOSE)) {
            Log.v(TAG, "Notifying update of " + uri + " for user " + userHandle
                    + " from observer " + observer + ", syncToNetwork " + syncToNetwork);
        }

        // Notify for any user other than the caller's own requires permission.
        final int callingUserHandle = UserHandle.getCallingUserId();
        if (userHandle != callingUserHandle) {
            mContext.enforceCallingOrSelfPermission(Manifest.permission.INTERACT_ACROSS_USERS,
                    "no permission to notify other users");
        }

        // We passed the permission check; resolve pseudouser targets as appropriate
        if (userHandle < 0) {
            if (userHandle == UserHandle.USER_CURRENT) {
                userHandle = ActivityManager.getCurrentUser();
            } else if (userHandle != UserHandle.USER_ALL) {
                throw new InvalidParameterException("Bad user handle for notifyChange: "
                        + userHandle);
            }
        }

        final int uid = Binder.getCallingUid();
        // This makes it so that future permission checks will be in the context of this
        // process rather than the caller's process. We will restore this before returning.
        long identityToken = clearCallingIdentity();
        try {
            ArrayList<ObserverCall> calls = new ArrayList<ObserverCall>();
            synchronized (mRootNode) {
                mRootNode.collectObserversLocked(uri, 0, observer, observerWantsSelfNotifications,
                        userHandle, calls);
            }
            final int numCalls = calls.size();
            for (int i=0; i<numCalls; i++) {
                ObserverCall oc = calls.get(i);
                try {
                    oc.mObserver.onChange(oc.mSelfChange, uri, userHandle);
                    if (Log.isLoggable(TAG, Log.VERBOSE)) {
                        Log.v(TAG, "Notified " + oc.mObserver + " of " + "update at " + uri);
                    }
                } catch (RemoteException ex) {
                    synchronized (mRootNode) {
                        Log.w(TAG, "Found dead observer, removing");
                        IBinder binder = oc.mObserver.asBinder();
                        final ArrayList<ObserverNode.ObserverEntry> list
                                = oc.mNode.mObservers;
                        int numList = list.size();
                        for (int j=0; j<numList; j++) {
                            ObserverNode.ObserverEntry oe = list.get(j);
                            if (oe.observer.asBinder() == binder) {
                                list.remove(j);
                                j--;
                                numList--;
                            }
                        }
                    }
                }
            }
            if (syncToNetwork) {
                SyncManager syncManager = getSyncManager();
                if (syncManager != null) {
                    syncManager.scheduleLocalSync(null /* all accounts */, callingUserHandle, uid,
                            uri.getAuthority());
                }
            }
        } finally {
            restoreCallingIdentity(identityToken);
        }
    }