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Erlang run time environment


Erlang run time environment

By : user2953922
Date : November 21 2020, 07:31 AM
it helps some times The Erlang runtime environment in particular contains the Erlang virtual machine, the kernel and the standard libraries.
Erlang in general provides a lot more tools (compiler, debugger, monitoring tools etc.).
code :


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erlang OTP app using rebar, dev environment

erlang OTP app using rebar, dev environment


By : Rhubarbs
Date : March 29 2020, 07:55 AM
help you fix your problem In your case, the modules you pull into the deps directory should typically be called from within your application code - and your application can be typically invoked from the Erlang shell using the application:start/1 function. If you haven't yet, I strongly suggest that you read Chapter 12, "OTP Behaviors", of Francesco Cesarini's excellent book Erlang Programming - it's a great practical introduction for what you're attempting.
Erlang application: different environment

Erlang application: different environment


By : Najib Bjaoui
Date : March 29 2020, 07:55 AM
Hope that helps You can use application config file as well. you can also pass the config as parameter while starting an erlang console that can help you in setting up environment variables. so you are pass test.config or production.config based on environment there by no need to compile the code and start them.
You can find more info here
Erlang, override environment

Erlang, override environment


By : Rahul Ranjan
Date : March 29 2020, 07:55 AM
may help you . If you want to completely avoid changes to your application's code, your best bet is to use an external configuration file and copy from your centralized server to each "local" server. If you specify a file path at the end of your application list in sys.config (assuming you're using releases), the BEAM VM will also load this file as additional configuration.
Using this, you can make a file in a location like /etc/my_service/extended.config and have it automatically update using some service or another. Puppet is an example of a tool that could do that part for you; looks like Hiera (which I'm not familiar with) would be another.
code :
[
    {my_app1, [
            {my_param1, 1},
            {my_param2, "string"}
        ]},
    {my_app2, [
            ...
        ]},
    "/etc/my_service/extended.config"
].
-record(setting, {key, value}).
get_setting(App, Key) ->
    get_setting(App, Key, undefined).

get_setting(App, Key, Default) ->
    case mnesia:dirty_read(settings, {App, Key}) of
        [] ->
            application:get_env(App, Key, Default);
        [_ = #setting{value = Value}] ->
            Value
    end.
Virtual Environment for Erlang

Virtual Environment for Erlang


By : hurryupcheng
Date : March 29 2020, 07:55 AM
seems to work fine Why do you need virtual environment for Erlang/Elixir, what you try to solve with it? In my mind virtualenv in Python is used for separating system-level python libs from project-level. This is not a problem in Erlang/Elixir because of project is acts like "virtualenv" and rebar or mix installs dependencies in it.
erlang change a fun environment

erlang change a fun environment


By : umarsulur
Date : March 29 2020, 07:55 AM
Does that help No, that would break the referential transparency property of the fun as a constant value. It's no different from updating a field of a tuple, and such a destructive change could even make the garbage collector crash because it violates the internal assumptions about directions of pointers.
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