tres/message_handler: Remove an unused argument

lib/tres/application.ex

@@ -8,11 +8,9 @@ defmodule Tres.Application do
   def start(_type, _args) do
     import Supervisor.Spec
 
-    {cb_mod, _cb_args} = Tres.Utils.get_callback_module()
-
     children = [
       worker(Registry, [[keys: :unique, name: SwitchRegistry]], id: SwitchRegistry),
-      supervisor(Tres.MessageHandlerSup, [cb_mod], id: MessageHandlerSup),
+      supervisor(Tres.MessageHandlerSup, [], id: MessageHandlerSup),
       supervisor(OVSDB, [], id: OVSDB)
     ]
 

lib/tres/message_handler_sup.ex

@@ -1,11 +1,11 @@
 defmodule Tres.MessageHandlerSup do
   use DynamicSupervisor
 
-  def start_link(cb_mod) do
+  def start_link() do
-    DynamicSupervisor.start_link(__MODULE__, [cb_mod], name: __MODULE__)
+    DynamicSupervisor.start_link(__MODULE__, [], name: __MODULE__)
   end
 
-  def init([_cb_mod]) do
+  def init(_init_args) do
     DynamicSupervisor.init(strategy: :one_for_one)
   end
 
@@ -13,4 +13,10 @@ defmodule Tres.MessageHandlerSup do
     {cb_mod, cb_args} = Tres.Utils.get_callback_module()
     DynamicSupervisor.start_child(__MODULE__, {cb_mod, [{dpid, aux_id}, cb_args]})
   end
+
+  @spec count_handlers() :: non_neg_integer()
+  def count_handlers do
+    count_value = DynamicSupervisor.count_children(__MODULE__)
+    count_value[:active]
+  end
 end