[erlang-questions] OTP Worker Supervision

[Graham Hay]

http://learnyousomeerlang.com/supervisors

On 15 October 2014 16:32, Curtis J Schofield (ram9) <curtis@REDACTED> wrote:

> Thank you Vance. That does indeed work - I think I want 'permanent' so
> that the worker comes back if the application crashes - is it as
> simple as that?
>
> My question about ChildSpec is about 'Module' and the erlang docs.
>
> From the erlang docs:
> "Modules is used by the release handler during code replacement to
> determine which processes are using a certain module. As a rule of
> thumb Modules should be a list with one element [Module], where Module
> is the callback module, if the child process is a supervisor,
> gen_server or gen_fsm."
>
> My 'sender_worker' is just a module - it is not a supervisor,
> gen_server or gen_fsm. Is there some specific interface that the
> module function 'boot_send' needs to conform to - or is returning {ok,
> Pid} what it needs to do?
>
>
>
> On Tue, Oct 14, 2014 at 9:34 PM, Vance Shipley <vances@REDACTED> wrote:
> >
> > On Wed, Oct 15, 2014 at 5:50 AM, Curtis J Schofield (ram9)
> <curtis@REDACTED>
> > wrote:
> >>
> >> I have been able to create a simple application with a supervisor and
> >> spawn
> >> and link a child process. I feel like I have 'hacked' it and would
> >> like to hear what the ideomatic way of this is.
> >>
> >      init([]) ->
> >          {ok, Pid} = sender_worker:boot_send(),
> >          link(Pid),
> >          Pids = [],
> >          {ok, {{one_for_one, 1, 5}, Pids}}.
> >
> > The supervisor behaviour encapsulates process creation and linking.  All
> you
> > need to do is specify the process to create in a child specification:
> >
> >      {Id, StartFunc, Restart, Shutdown, Type, Modules}
> >
> > So just:
> >
> >      init([]) ->
> >           StartMod = sender_worker,
> >           ChildSpec = {StartMod, {StartMod, boot_send, []}, temporary, 4,
> > worker, [StartMod]},
> >           {ok, {{one_for_one, 1, 5}, [ChildSpec]}}.
> >
> > --
> >      -Vance
> >
> > On Wed, Oct 15, 2014 at 5:50 AM, Curtis J Schofield (ram9)
> <curtis@REDACTED>
> > wrote:
> >>
> >> Hi - I'm a beginner and am requesting feedback on some code I wrote.
> >>
> >> I haven't  been able to deduce 'the otp way' to build a worker process.
> >>  ( this worker generates some garbage and puts it into rabbitmq)
> >>
> >> I have been able to create a simple application with a supervisor and
> >> spawn
> >> and link a child process. I feel like I have 'hacked' it and would
> >> like to hear what the ideomatic way of this is.
> >>
> >>
> >>
> >>
> https://github.com/robotarmy/amqresearch/blob/master/send/src/sender_sup.erl
> >>
> >>
> >>
> https://github.com/robotarmy/amqresearch/blob/master/send/src/sender_worker.erl
> >>
> >>
> >> Feedback on my code would be appreciated.
> >>
> >>
> >> --
> >> ---
> >> Modern Yoga vs Traditional Yoga
> >> http://swamij.com/traditional-yoga.htm#swamirama
> >> _______________________________________________
> >> erlang-questions mailing list
> >> erlang-questions@REDACTED
> >> http://erlang.org/mailman/listinfo/erlang-questions
> >
> >
> >
> >
> > --
> > --
> >      -Vance
>
>
>
> --
> ---
> Modern Yoga vs Traditional Yoga
> http://swamij.com/traditional-yoga.htm#swamirama
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