Adding a method to throttle backup manager calls
Notifying backup manager when a boolean preference changes
Bug: 22885775
Change-Id: I105013af1841f6cd87472f558fa490670ed1ba24
diff --git a/src/com/android/launcher3/LauncherBackupAgentHelper.java b/src/com/android/launcher3/LauncherBackupAgentHelper.java
index 6619aaf..2177f52 100644
--- a/src/com/android/launcher3/LauncherBackupAgentHelper.java
+++ b/src/com/android/launcher3/LauncherBackupAgentHelper.java
@@ -20,6 +20,7 @@
import android.app.backup.BackupDataInput;
import android.app.backup.BackupManager;
import android.content.Context;
+import android.content.SharedPreferences;
import android.database.Cursor;
import android.os.ParcelFileDescriptor;
import android.util.Log;
@@ -32,13 +33,13 @@
private static final String TAG = "LauncherBAHelper";
+ private static final String KEY_LAST_NOTIFIED_TIME = "backup_manager_last_notified";
+
private static final String LAUNCHER_DATA_PREFIX = "L";
static final boolean VERBOSE = false;
static final boolean DEBUG = false;
- private static BackupManager sBackupManager;
-
/**
* Notify the backup manager that out database is dirty.
*
@@ -47,10 +48,29 @@
* @param context application context
*/
public static void dataChanged(Context context) {
- if (sBackupManager == null) {
- sBackupManager = new BackupManager(context);
+ dataChanged(context, 0);
+ }
+
+ /**
+ * Notify the backup manager that out database is dirty.
+ *
+ * <P>This does not force an immediate backup.
+ *
+ * @param context application context
+ * @param throttleMs duration in ms for which two consecutive calls to backup manager should
+ * not be made.
+ */
+ public static void dataChanged(Context context, long throttleMs) {
+ SharedPreferences prefs = Utilities.getPrefs(context);
+ long now = System.currentTimeMillis();
+ long lastTime = prefs.getLong(KEY_LAST_NOTIFIED_TIME, 0);
+
+ // User can manually change the system time, which could lead to now < lastTime.
+ // Re-backup in that case, as the backup will have a wrong lastModifiedTime.
+ if (now < lastTime || now >= (lastTime + throttleMs)) {
+ BackupManager.dataChanged(context.getPackageName());
+ prefs.edit().putLong(KEY_LAST_NOTIFIED_TIME, now).apply();
}
- sBackupManager.dataChanged();
}
private LauncherBackupHelper mHelper;