X3m.System.Test.Router.private_service

You're seeing just the function private_service, go back to X3m.System.Test.Router module for more information.
Link to this function

private_service(message)

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Specs

private_service(X3m.System.Message.t()) :: :ok

This service is not shared with other nodes!

Accepts private_service service call, routing it's message to Elixir.X3m.System.Test.Controller.private/1.

If result of that invocation is {:reply, %X3m.System.Message{}}, it sends message to message.reply_to pid.

If result of invocation is :noreply, nothing is sent to that pid.

In any case function returns :ok.

Example:

iex> :private_service |>
...>   X3m.System.Message.new() |>
...>   Elixir.X3m.System.Test.Router.private_service()
:ok