Add open/3, open_link/1-3, and fix some dialyzer warnings

src/hanoidb.erl

@@ -31,7 +31,8 @@
 -export([init/1, handle_call/3, handle_cast/2, handle_info/2,
          terminate/2, code_change/3]).
 
--export([open/1, open/2, transact/2, close/1, get/2, lookup/2, delete/2, put/3, put/4,
+-export([open/1, open/2, open/3, open_link/1, open_link/2, open_link/3,
+         transact/2, close/1, get/2, lookup/2, delete/2, put/3, put/4,
          fold/3, fold_range/4, destroy/1]).
 
 -export([get_opt/2, get_opt/3]).
@@ -74,16 +75,46 @@
 %% Create or open a hanoidb store.  Argument `Dir' names a
 %% directory in which to keep the data files.  By convention, we
 %% name hanoidb data directories with extension ".hanoidb".
-- spec open(Dir::string()) -> hanoidb().
+- spec open(Dir::string()) -> {ok, hanoidb()} | ignore | {error, term()}.
 open(Dir) ->
     open(Dir, []).
 
 %% @doc Create or open a hanoidb store.
-- spec open(Dir::string(), Opts::[config_option()]) -> hanoidb().
+- spec open(Dir::string(), Opts::[config_option()]) -> {ok, hanoidb()} | ignore | {error, term()}.
 open(Dir, Opts) ->
     ok = start_app(),
     gen_server:start(?MODULE, [Dir, Opts], []).
 
+%% @doc Create or open a hanoidb store with a registered name.
+- spec open(Name::{local, Name::atom()} | {global, GlobalName::term()} | {via, ViaName::term()},
+            Dir::string(), Opts::[config_option()]) -> {ok, hanoidb()} | ignore | {error, term()}.
+open(Name, Dir, Opts) ->
+    ok = start_app(),
+    gen_server:start(Name, ?MODULE, [Dir, Opts], []).
+
+%% @doc
+%% Create or open a hanoidb store as part of a supervision tree.
+%% Argument `Dir' names a directory in which to keep the data files.
+%% By convention, we name hanoidb data directories with extension
+%% ".hanoidb".
+- spec open_link(Dir::string()) -> {ok, hanoidb()} | ignore | {error, term()}.
+open_link(Dir) ->
+    open_link(Dir, []).
+
+%% @doc Create or open a hanoidb store as part of a supervision tree.
+- spec open_link(Dir::string(), Opts::[config_option()]) -> {ok, hanoidb()} | ignore | {error, term()}.
+open_link(Dir, Opts) ->
+    ok = start_app(),
+    gen_server:start_link(?MODULE, [Dir, Opts], []).
+
+%% @doc Create or open a hanoidb store as part of a supervision tree
+%% with a registered name.
+- spec open_link(Name::{local, Name::atom()} | {global, GlobalName::term()} | {via, ViaName::term()},
+                 Dir::string(), Opts::[config_option()]) -> {ok, hanoidb()} | ignore | {error, term()}.
+open_link(Name, Dir, Opts) ->
+    ok = start_app(),
+    gen_server:start_link(Name, ?MODULE, [Dir, Opts], []).
+
 %% @doc
 %% Close a Hanoi data store.
 - spec close(Ref::pid()) -> ok.
@@ -277,7 +308,7 @@ open_levels(Dir, Options) ->
 
     %% remove old nursery data file
     NurseryFileName = filename:join(Dir, "nursery.data"),
-    file:delete(NurseryFileName),
+    _ = file:delete(NurseryFileName),
 
     %% Do enough incremental merge to be sure we won't deadlock in insert
     {TopLevel, MaxMerge} =
@@ -314,7 +345,7 @@ handle_info({bottom_level, N}, #state{ nursery=Nursery, top=TopLevel }=State)
     State2 = State#state{ max_level = N,
                           nursery= hanoidb_nursery:set_max_level(Nursery, N) },
 
-    hanoidb_level:set_max_level(TopLevel, N),
+    _ = hanoidb_level:set_max_level(TopLevel, N),
 
     {noreply, State2};
 
@@ -367,7 +398,7 @@ handle_call({get, Key}, From, State=#state{ top=Top, nursery=Nursery } ) when is
         {value, Value} when is_binary(Value) ->
             {reply, {ok, Value}, State};
         none ->
-            hanoidb_level:lookup(Top, Key, fun(Reply) -> gen_server:reply(From, Reply) end),
+            _ = hanoidb_level:lookup(Top, Key, fun(Reply) -> gen_server:reply(From, Reply) end),
             {noreply, State}
     end;
 

src/hanoidb_nursery.erl

@@ -99,7 +99,7 @@ read_nursery_from_log(Directory, MaxLevel, Config) ->
 
 %% @doc Add a Key/Value to the nursery
 %% @end
--spec do_add(#nursery{}, binary(), binary()|?TOMBSTONE, pos_integer() | infinity, pid()) -> {ok, #nursery{}}.
+-spec do_add(#nursery{}, binary(), binary()|?TOMBSTONE, non_neg_integer() | infinity, pid()) -> {ok, #nursery{}}.
 do_add(Nursery, Key, Value, infinity, Top) ->
     do_add(Nursery, Key, Value, 0, Top);
 do_add(Nursery=#nursery{log_file=File, cache=Cache, total_size=TotalSize, count=Count, config=Config}, Key, Value, KeyExpiryTime, Top) ->