reduce messaging to vnode manager

apps/kv/src/kv_vnode_manager.erl

@@ -11,9 +11,7 @@
 %%% gen_server callbacks
 -export([init/1, handle_call/3, handle_cast/2]).
 
--record(kv_vnode_manager, {table :: ets:table()}).
-
--type state() :: #kv_vnode_manager{}.
+-type state() :: {}.
 
 %%% public api
 
@@ -23,37 +21,44 @@ start_link() ->
 -spec get_local(Key :: binary()) -> {ok, Value :: term()} | none.
 get_local(Key) ->
     Index = kv_ring:key_to_index(Key),
-    gen_server:call(?MODULE, {get, Index, Key}).
+    VNode = get_vnode(Index),
+    kv_vnode:get(VNode, Key).
 
 -spec put_local(Key :: binary(), Value :: term()) -> ok.
 put_local(Key, Value) ->
     Index = kv_ring:key_to_index(Key),
-    gen_server:cast(?MODULE, {put, Index, Key, Value}).
+    VNode = get_vnode(Index),
+    kv_vnode:put(VNode, Key, Value).
 
 %%% gen_server callbacks
 
 -spec init([]) -> {ok, state()}.
 init([]) ->
-    {ok, #kv_vnode_manager{table = ets:new(?MODULE, [set])}}.
+    ?MODULE = ets:new(?MODULE, [set, protected, named_table, {read_concurrency, true}]),
+    {ok, {}}.
 
-handle_call({get, Index, Key}, _From, State) ->
-    VNode = get_vnode(Index, State),
-    {reply, kv_vnode:get(VNode, Key), State}.
-
-handle_cast({put, Index, Key, Value}, State) ->
-    VNode = get_vnode(Index, State),
-    ok = kv_vnode:put(VNode, Key, Value),
-    {noreply, State}.
-
-%%% internal functions
-
--spec get_vnode(Index :: kv_ring:index(), state()) -> pid().
-get_vnode(Index, #kv_vnode_manager{table = Table}) ->
-    case ets:lookup(Table, Index) of
+handle_call({get_vnode, Index}, _From, State) ->
+    VNode =
+        case ets:lookup(?MODULE, Index) of
             [{_, Pid}] ->
                 Pid;
             [] ->
                 {ok, Pid} = kv_vnode_sup:start_vnode(Index),
-            ets:insert(Table, {Index, Pid}),
+                ets:insert(?MODULE, {Index, Pid}),
                 Pid
+        end,
+    {reply, VNode, State}.
+
+handle_cast(_, _) ->
+    error(not_implemented).
+
+%%% internal functions
+
+-spec get_vnode(Index :: kv_ring:index()) -> pid().
+get_vnode(Index) ->
+    case ets:lookup(?MODULE, Index) of
+        [{_, Pid}] ->
+            Pid;
+        [] ->
+            gen_server:call(?MODULE, {get_vnode, Index})
     end.