[erlang-questions] Pass Name to Dynamic Supervisors

[tom kelly]

Hi Chris,

We do something like this in our application.

First, in our "static" supervision tree we start a dynamic supervisor:


init(Args) ->
    {ok, {
           {one_for_one, 5, 5},
           [
           {dynamic_supervisor_id,
          {dynamic_supervisor, start_link, [Args]},
          permanent,
          infinity,
          supervisor,
          [dynamic_supervisor]},


Where the dynamic_supervisor module has the functions:


start_link(Args) ->
    supervisor:start_link({local,?MODULE}, ?MODULE, [Args]).

init(_Args) ->
    {ok, {
           {one_for_one, 5, 5},
           []
         }}.



Then in our code we can dynamically start supervised processes with
registered names, ProcName:


supervisor:start_child(dynamic_supervisor,
                    {ProcName,
                     {gen_server, start_link,
                      [{local, ProcName}, ?MODULE, [StartArgs], []]},
                     permanent,
                     10000,
                     worker,
                     [?MODULE]
                    })


And shut them down with:


supervisor:terminate_child(dynamic_supervisor,PName),
supervisor:delete_child(dynamic_supervisor,PName),



This is just a few clippings from our code base here with the names made
more generic, so there might be a syntax error or two but I think it helps
do what you want.

//Tom.




On Thu, Sep 8, 2011 at 3:09 AM, Christopher Wilson <wilsoncj1@REDACTED>wrote:

> Is there a way to pass a name/ID into the call to supervisor:start_child,
> more specifically to init()?  I'd like to specify the name of the worker or
> supervisor such that when I ran supervisor:which_children I could identify
> what's what.
>
> Also, I've tried [unsuccessfully] to dynamically create a child spec and
> add pass that in.  Are there any decent examples out there on how to do this
> outside of the man pages?
>
> Thank you.
>
> -Chris
>
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