anchor.diff:  -behaviour(gen_server).
   
   %% API
  --export([start_link/0, stop/0, load/3, sync/5, done/1, running/0, running/1, diffs/0, diffs/1]).
  +-export([start_link/0, stop/0, load/3, loaded/0, sync/5, done/1, running/0, running/1, diffs/0, diffs/1]).
   
   %% gen_server callbacks
   -export([init/1, handle_call/3, handle_cast/2, handle_info/2,
  
positive.code:   
  diffs(Node) ->
    gen_server:call({sync_manager, Node}, diffs).
  
  %%====================================================================
  %% gen_server callbacks
  
negative.code: %% @doc Handling call messages
  %% @end 
  %%--------------------------------------------------------------------
  handle_call(loaded, _From, State) ->
    {reply, sync_server_sup:sync_servers(), State};
  
  handle_call(running, _From, State = #state{running=Running}) ->
    {reply, Running, State};
    
  