[erlang-questions] Can not start many children with simple_one_for_one

[Barco You]

Got it! Thank you very much!


On Tue, Jul 30, 2013 at 11:00 AM, James Aimonetti <james@REDACTED> wrote:

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> On 07/29/2013 07:53 PM, Barco You wrote:
> > Dear Forks,
> >
> > I have a supervisor who will start children with
> > simple_one_for_one strategy. First of all I have server process who
> > starts the mentioned supervisor by using {ok, Pid} =
> > supervisor:start_child(Supsup, ?SPEC), and then I add the children
> > under the mentioned supervisor one by one also with
> > supervisor:start_child(Pid, Args), but only the first child can be
> > started and the rest children just got "process already started"
> > error message. What's wrong I made? the snippets of the codes as
> > following:
> >
> > -module(spider_sup). -behaviour(supervisor).
> >
> > -export([start_link/0]). %% API. -export([init/1]). %% supervisor.
> >
> > -define(SUPERVISOR, ?MODULE).
> >
> > %% API.
> >
> > start_link() -> supervisor:start_link({local, ?SUPERVISOR},
> > ?MODULE, []).
> >
> > %% supervisor.
> >
> > init([]) -> MaxRestart = 5, MaxTime = 60, {ok,
> > {{simple_one_for_one, MaxRestart, MaxTime}, [{spider, {spider,
> > start_link, []}, permanent, 120, worker, [spider]}]}}.
> >
> ----------------------------------------------------------------------------------------------------------
> >
> >
> - -module(spider).
> >
> > -behavior(gen_fsm).
> >
> > -export([start_link/1]).
> >
> > -export([init/1, event1/2, handle_event/3, handle_sync_event/4,
> > code_change/4, terminate/3, handle_info/3]).
> >
> > start_link(Code) -> gen_fsm:start_link({local, ?MODULE}, ?MODULE,
> > Code, []).
> >
> > init(Code) -> io:format("~p Starting~n",[Code]), {ok, event1, Code,
> > 10000}.
> >
> ---------------------------------------------------------------------------------------------------
> >
> >
> %snippet from the server process
> > start_spiders(_Pid, []) -> ok; start_spiders(Pid, [HCode | TCode])
> > -> supervisor:start_child(Pid, [HCode]), start_spiders(Pid,
> > TCode).
> >
> >
> >
> > _______________________________________________ erlang-questions
> > mailing list erlang-questions@REDACTED
> > http://erlang.org/mailman/listinfo/erlang-questions
> >
>
> It appears your gen_fsm is registering itself as a named process. So
> the first succeeds because the name isn't registered; subsequent
> attempts will not start additional children as the name is no longer
> available. Try using gen_fsm:start_link/3 [0] instead.
>
> [0]
>
> http://erldocs.com/R15B/stdlib/gen_fsm.html?i=2&search=gen_fsm%20start#start_link/3
>
> - --
> James Aimonetti
> Distributed Systems Engineer / DJ MC_
>
> 2600hz | http://2600hz.com
> sip:james@REDACTED
> tel: 415.886.7905
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