Erlang如何将参数从模块传递到另一个

Question

I have an application written in erlang, i added a supervisor for distribution and now after parsing the configFile.cfg in the supervisor, i want to pass the configuration to my old application. i have something like this now:

-module(supervisor_sup).
start() ->
    application_app:start().

what i want is:

-module(supervisor_sup).

-record(config,{param1,param2}).
%After parsing the configFile.cfg
Conf = #config{param1 = Param1,
            param2 = Param2},

start(Conf) ->
    application_app:start(Conf).

Answer 1

It is uncommon to start applications from supervisors or modules under supervisors. The preferred way is to use application dependency to make sure all applications are started, and in the right order.

However, if you want some configuration to be available from several different applications without having to parse the configuration more than once, maybe the gproc library is what you are looking for? https://github.com/uwiger/gproc

gproc can be used to efficiently set global configuration and much more. Even in a distributed environment.