anchor.diff:      {_MulticastId, _SuccessesNumber, _FailuresNumber, _CanonicalIdsNumber, Results} = GCMResult,
       lists:map(fun({Result, RegId}) -> {RegId, parse(Result)} end, lists:zip(Results, RegIds)).
   
  -do_backoff(RetryAfter, RegIds, Message, Key) ->
  +do_backoff(_, _, _, _, ?RETRY + 1) ->
  +    ok;
  +
  +do_backoff(RetryAfter, RegIds, Message, Key, Retry) ->
       case RetryAfter of
           no_retry ->
               ok;
   	_ ->
  -	    timer:apply_after(RetryAfter * 1000, ?MODULE, do_push, [RegIds, Message, Key])
  +	    timer:apply_after(RetryAfter * 1000, ?MODULE, do_push, [RegIds, Message, Key, Retry+1])
       end.
   
   parse(Result) ->
  
positive.code: handle_call(stop, _From, State) ->
      {stop, normal, stopped, State};
  
  handle_call({send, RegIds, Message}, _From, #state{key=Key} = State) ->
      Reply = do_push(RegIds, Message, Key),
      {reply, Reply, State};
  
  handle_call(_Request, _From, State) ->
      Reply = ok,
      {reply, Reply, State}.
  
  handle_cast({send, RegIds, Message}, #state{key=Key} = State) ->
      do_push(RegIds, Message, Key),
      {noreply, State};
  
  handle_cast(_Msg, State) ->
  
negative.code:     gen_server:call(Name, stop).
  
  push(Name, RegIds, Message) ->
      push(Name, RegIds, Message, 1).
  
  push(Name, RegIds, Message, Retry) ->
      gen_server:cast(Name, {send, RegIds, Message, Retry}).
  
  sync_push(Name, RegIds, Message) ->
      sync_push(Name, RegIds, Message, 1).
  
  sync_push(Name, RegIds, Message, Retry) ->
      gen_server:call(Name, {send, RegIds, Message, Retry}).
  
  %% OTP
  start_link(Name, Key) ->
  