private void clearSBgDataStructures(){
synchronized (sBgLock) {
    sBgWorkspaceItems.clear();
    sBgAppWidgets.clear();
    sBgFolders.clear();
    sBgItemsIdMap.clear();
    sBgWorkspaceScreens.clear();
  }
}

private void clearSBgDataStructures ( ) { synchronized ( sBgLock ) { sBgWorkspaceItems . clear ( ) ; sBgAppWidgets . clear ( ) ; sBgFolders . clear ( ) ; sBgItemsIdMap . clear ( ) ; sBgWorkspaceScreens . clear ( ) ; } }
clears all the sbg data structures
