chore: use other module for default partitioner

lib/klife/default_partitioner.ex

@@ -0,0 +1,11 @@
+defmodule Klife.DefaultPartitioner do
+  @behaviour Klife.Partitioner
+  alias Klife.Record
+
+  @impl Klife.Partitioner
+  def get_partition(%Record{key: nil}, max_partition),
+    do: Enum.random(0..max_partition)
+
+  def get_partition(%Record{key: key}, max_partition),
+    do: :erlang.phash2(key, max_partition + 1)
+end

lib/klife/partitioner.ex

@@ -1,13 +1,3 @@
 defmodule Klife.Partitioner do
-  alias Klife.Record
-
-  @callback get_partition(record :: %Record{}, max_partition :: integer) :: integer
-
-  @behaviour __MODULE__
-
-  @impl __MODULE__
-  def get_partition(%Record{key: nil}, max_partition),
-    do: Enum.random(0..max_partition)
-
-  def get_partition(%Record{key: key}, max_partition), do: :erlang.phash2(key, max_partition + 1)
+  @callback get_partition(record :: %Klife.Record{}, max_partition :: integer) :: integer
 end

lib/klife/producer/controller.ex

@@ -278,7 +278,7 @@ defmodule Klife.Producer.Controller do
 
       data = %{
         max_partition: max_partition,
-        default_partitioner: config_topic[:partitioner] || Klife.Partitioner
+        default_partitioner: config_topic[:partitioner] || Klife.DefaultPartitioner
       }
 
       case :ets.lookup(table_name, topic.name) do