%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2012-2016. 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%
%%
-module(ct_default_gl).
-export([start_link/1, stop/0]).
-export([init/1,handle_call/3,handle_cast/2,handle_info/2,terminate/2]).
%% start_link()
%% Start a new group leader process.
start_link(ParentGL) ->
do_start(ParentGL, 3).
do_start(_ParentGL, 0) ->
exit({?MODULE,startup});
do_start(ParentGL, Retries) ->
case whereis(?MODULE) of
undefined ->
case gen_server:start_link(?MODULE, [ParentGL], []) of
{ok,Pid} ->
{ok,Pid};
Other ->
Other
end;
Pid ->
exit(Pid, kill),
timer:sleep(1000),
do_start(ParentGL, Retries-1)
end.
%% stop(Pid)
%% Stop a group leader process.
stop() ->
gen_server:cast(whereis(?MODULE), stop).
%%% Internal functions.
init([ParentGL]) ->
register(?MODULE, self()),
{ok,#{parent_gl_pid => ParentGL,
parent_gl_monitor => erlang:monitor(process,ParentGL)}}.
handle_cast(stop, St) ->
{stop,normal,St}.
%% If the parent group leader dies, fall back on using the local user process
handle_info({'DOWN',Ref,process,_,_Reason}, #{parent_gl_monitor := Ref} = St) ->
User = whereis(user),
{noreply,St#{parent_gl_pid => User,
parent_gl_monitor => erlang:monitor(process,User)}};
handle_info({io_request,_From,_ReplyAs,_Req} = IoReq,
#{parent_gl_pid := ParentGL} = St) ->
ParentGL ! IoReq,
{noreply,St};
handle_info(Msg, St) ->
io:format(user, "Common Test Group Leader process got: ~tp~n", [Msg]),
{noreply,St}.
handle_call(_Req, _From, St) ->
{reply,ok,St}.
terminate(_, _) ->
ok.
