%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2007-2011. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
%%
%%----------------------------------------------------------------------
%% Purpose: Timer handling
%%----------------------------------------------------------------------
-module(megaco_timer).
%% Application internal export
-export([
init/1,
restart/1,
verify/1
]).
-include_lib("megaco/include/megaco.hrl").
%%-----------------------------------------------------------------
%% init(Timer) -> {TimeoutTime, NewTimer}
%% Timer = megaco_timer()
%% NewTimer = megaco_timer()
%% TimeoutTime = infinity | integer()
%%
init(SingleWaitFor) when SingleWaitFor =:= infinity ->
{SingleWaitFor, timeout};
init(SingleWaitFor) when is_integer(SingleWaitFor) and (SingleWaitFor >= 0) ->
{SingleWaitFor, timeout};
init(Timer) when is_record(Timer, megaco_incr_timer) ->
return_incr(Timer).
%% Returns {WaitFor, NewTimer} | {WaitFor, timeout}
restart(#megaco_incr_timer{wait_for = Old,
factor = Factor,
incr = Incr,
max_retries = MaxRetries} = Timer) ->
New = wait_for(Old, Factor, Incr),
Max = decr(MaxRetries),
Timer2 = Timer#megaco_incr_timer{wait_for = New,
max_retries = Max},
return_incr(Timer2);
restart({Timer, timeout}) when is_record(Timer, megaco_incr_timer) ->
restart(Timer).
wait_for(Old, Factor, Incr) ->
New = (Old * Factor) + Incr,
if
New < 0 ->
0;
true ->
New
end.
verify(#megaco_incr_timer{wait_for = WaitFor,
factor = Factor,
incr = Incr,
max_retries = MaxRetries}) ->
(megaco_config_misc:verify_strict_uint(WaitFor) and
megaco_config_misc:verify_strict_uint(Factor) and
megaco_config_misc:verify_strict_int(Incr) and
verify_max_retries(MaxRetries));
verify(Timer) ->
megaco_config_misc:verify_uint(Timer).
verify_max_retries(infinity_restartable) ->
true;
verify_max_retries(Val) ->
megaco_config_misc:verify_uint(Val).
%%-----------------------------------------------------------------
return_incr(#megaco_incr_timer{wait_for = WaitFor,
max_retries = infinity} = Timer) ->
{WaitFor, Timer};
return_incr(#megaco_incr_timer{wait_for = WaitFor,
max_retries = infinity_restartable} = Timer) ->
{WaitFor, {Timer, timeout}};
return_incr(#megaco_incr_timer{wait_for = WaitFor,
max_retries = Int} = Timer)
when is_integer(Int) and (Int > 0) ->
{WaitFor, Timer};
return_incr(#megaco_incr_timer{wait_for = WaitFor,
max_retries = 0} = _Timer) ->
{WaitFor, timeout}.
decr(infinity = V) -> V;
decr(infinity_restartable = V) -> V;
decr(Int) when is_integer(Int) -> Int - 1.
