Mas i335 otp24 (#336)

* Address OTP24 warnings, ct and eunit paths

* Reorg to add OTP 24 support

* Update VOLUME.md

* Correct broken refs

* Update README.md

* CI on all main branches

Co-authored-by: Ulf Wiger <ulf@wiger.net>

docs/volume/single_node/src/basho_bench_driver_eleveleddb.erl

@@ -0,0 +1,93 @@
+%% -------------------------------------------------------------------
+%%
+%% Copyright (c) 2015 Basho Techonologies
+%%
+%% This file is provided to you under the Apache License,
+%% Version 2.0 (the "License"); you may not use this file
+%% except in compliance with the License.  You may obtain
+%% a copy of the License at
+%%
+%%   http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing,
+%% software distributed under the License is distributed on an
+%% "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+%% KIND, either express or implied.  See the License for the
+%% specific language governing permissions and limitations
+%% under the License.
+%%
+%% -------------------------------------------------------------------
+
+%% Raw eleveldb driver. It opens a number of eleveldb instances and assigns
+%% one to each created worker in round robin fashion. So, for example, creating
+%% 32 instances and 64 concurrent workers would bind a pair of workers to 
+%% each instance for all operations.
+-module(basho_bench_driver_eleveleddb).
+
+-export([new/1,
+         run/4]).
+
+% -include("basho_bench.hrl").
+
+-record(state, {
+          instance
+         }).
+
+get_instances() ->
+    case basho_bench_config:get(eleveleddb_instances, undefined) of
+        undefined ->
+            Instances = start_instances(),
+            % ?INFO("Instances started ~w~n", [Instances]),
+            basho_bench_config:set(eleveleddb_instances, Instances),
+            Instances;
+        Instances ->
+            Instances
+    end.
+
+
+start_instances() ->
+    BaseDir = basho_bench_config:get(eleveleddb_dir, "."),
+    Num = basho_bench_config:get(eleveleddb_num_instances, 1),
+    % ?INFO("Starting up ~p eleveleddb instances under ~s .\n",
+    %       [Num, BaseDir]),
+    Refs = [begin
+                Dir = filename:join(BaseDir, "instance." ++ integer_to_list(N)),
+                % ?INFO("Opening eleveleddb instance in ~s\n", [Dir]),
+                {ok, Ref} = leveled_bookie:book_start(Dir, 2000, 500000000),
+                Ref
+            end || N <- lists:seq(1, Num)],
+    list_to_tuple(Refs).
+
+new(Id) ->
+    Instances = get_instances(),
+    Count = size(Instances),
+    Idx = ((Id - 1) rem Count) + 1,
+    % ?INFO("Worker ~p using instance ~p.\n", [Id, Idx]),
+    State = #state{instance = element(Idx, Instances)},
+    {ok, State}.
+
+
+run(get, KeyGen, _ValueGen, State = #state{instance = Ref}) ->
+    Key = KeyGen(),
+    case leveled_bookie:book_get(Ref, "PerfBucket", Key, o) of
+        {ok, _Value} ->
+            {ok, State};
+        not_found ->
+            {ok, State};
+        {error, Reason} ->
+            {error, Reason}
+    end;
+run(put, KeyGen, ValGen, State = #state{instance = Ref}) ->
+    Key = KeyGen(),
+    Value = ValGen(),
+    case leveled_bookie:book_put(Ref, "PerfBucket", Key, Value, []) of
+        ok ->
+            {ok, State};
+	pause ->
+	    timer:sleep(1000),
+	    {ok, State};
+        {error, Reason} ->
+            {error, Reason}
+    end.
+
+