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cloister

0.3.4
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The helper application to manage cluster, that uses hash ring to route requests to nodes. Automatically keeps track of connected nodes, provides helpers to determine where the term is to be executed, to multicast to all the nodes in the cluster and to retrieve current state of the cluster.

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cloister lib cloister manager.ex
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lib/cloister/manager.ex 

defmodule Cloister.Manager do

  @moduledoc false

  use Supervisor



  @spec start_link(opts :: keyword()) :: GenServer.on_start()

  def start_link(opts) do

    :ok = Application.ensure_started(:libring, :permanent)



    {state, opts} = Keyword.pop(opts, :state, [])

    Supervisor.start_link(__MODULE__, state, Keyword.put_new(opts, :name, __MODULE__))

  end



  @impl Supervisor

  def init(state) do

    state =

      state

      |> Keyword.put_new(:otp_app, Application.get_env(:cloister, :otp_app, :cloister))

      |> Keyword.put_new(:listener, Cloister.Modules.listener_module())



    {monitor_opts, state} = Keyword.pop(state, :monitor_opts, [])



    {additional_modules, state} =

      Keyword.pop(

        state,

        :additional_modules,

        Application.get_env(:cloister, :additional_modules, [])

      )



    additional_modules = Enum.filter(additional_modules, &ensure_compiled?/1)



    children =

      [

        {Cloister.Monitor, [{:state, state} | monitor_opts]},

        Cloister,

        Cloister.Node

      ] ++ additional_modules



    Supervisor.init(children, strategy: :rest_for_one)

  end



  defp ensure_compiled?(module),

    do: match?({:module, ^module}, Code.ensure_compiled(module))

end