is this valid message passing in nitrogen?

[Franklin Brauning]

event(ver_estado) ->
        Ref = make_ref(),
        wf:send_global(temporizador, {get_state, self(), Ref}),
        receive
            {Ref, Estado} ->
                wf:update(estado, wf:f("~p", [Estado])),
                wf:flush(),
                ok
        end;

temporizador is a global comet and when receives get_state it delivers data
to the requesting process (in the event function)

but I'm getting this kind of errors (the message content is what the comet delivers)

=WARNING REPORT==== 27-Apr-2017::13:54:06 ===
Unhandled message({#Ref<0.0.3407873.161072>,
                   {#{deadlines => [{<<"sv0nxabg9bjt">>,14827},{reload,36426}],
                      today => "jue"},
                    0}}) to websocket process (<0.23703.0>)

it works the first time ... but then it starts with these warnings

[Jesse Gumm]

Hi Franklin,

So this is combining two different things.  Keep in mind send_global sends that same message to every connected process to that global comet pool, which means you're very likely to get more than one response.  In the case of the "Unhandled Message", that's happening where the websocket process is receiving an unknown message while sitting in a "waiting for something to happen" state.  If there X processes connected to that comet pool, you're going to get X response messages back.

If you need more of a one-off-centralized process to respond, you might want to spin up a gen_server to handle it.

Or if you want something lighter than a gen_server to deal with naked bangs and receives, you could spin up a process using the process_registry_handler (http://nitrogenproject.com/doc/handlers/process_registry.html), which by default uses nprocreg (but could be use gproc).

You can then start or get a pid of a process by doing

{ok, Pid} = process_registry_handler:get_pid(Key, Fun).

Then, if a process named 'Key' is running, it will return the Pid of that process, and if the process named 'Key' is not running, it will start the process with the specified Fun.

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Jesse Gumm
Owner, Sigma Star Systems
414.940.4866 || sigma-star.com || @jessegumm