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absinthe lib absinthe subscription supervisor.ex
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lib/absinthe/subscription/supervisor.ex 

defmodule Absinthe.Subscription.Supervisor do

  @moduledoc false



  use Supervisor



  @spec start_link(atom() | [Absinthe.Subscription.opt()]) :: Supervisor.on_start()

  def start_link(pubsub) when is_atom(pubsub) do

    # start_link/1 used to take a single argument - the pub-sub - so in order

    # to maintain compatibility for existing users of the library we still

    # accept this argument and transform it into a keyword list.

    start_link(pubsub: pubsub)

  end



  def start_link(opts) when is_list(opts) do

    pubsub =

      case Keyword.fetch!(opts, :pubsub) do

        [module] when is_atom(module) ->

          module



        module ->

          module

      end



    pool_size = Keyword.get(opts, :pool_size, System.schedulers_online() * 2)

    compress_registry? = Keyword.get(opts, :compress_registry?, true)



    # Absinthe.Subscription.Proxy listens for subscription messages

    # from other nodes and then runs Subscription.Local.publish_mutation to process

    # the mutation on the local node. By default it runs in a task superivsor so that

    # requests are handled concurrently. However, this may not work for some

    # systems. Setting `async` to false makes it so that the requests are processed one at a time.

    async? = Keyword.get(opts, :async, true)



    Supervisor.start_link(__MODULE__, {pubsub, pool_size, compress_registry?, async?})

  end



  def init({pubsub, pool_size, compress_registry?, async?}) do

    registry_name = Absinthe.Subscription.registry_name(pubsub)

    meta = [pool_size: pool_size]



    children = [

      {Registry,

       [

         keys: :duplicate,

         name: registry_name,

         partitions: System.schedulers_online(),

         meta: meta,

         compressed: compress_registry?

       ]},

      {Absinthe.Subscription.ProxySupervisor, [pubsub, registry_name, pool_size, async?]}

    ]



    Supervisor.init(children, strategy: :one_for_one)

  end

end