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bitcask_io.erl
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bitcask_io.erl
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%% -------------------------------------------------------------------
%%
%% bitcask: Eric Brewer-inspired key/value store
%%
%% Copyright (c) 2013 Basho Technologies, Inc. All Rights Reserved.
%%
%% 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.
%%
%% -------------------------------------------------------------------
-module(bitcask_io).
-compile(export_all).
file_open(Filename, Opts) ->
M = file_module(),
M:file_open(Filename, Opts).
file_close(Ref) ->
M = file_module(),
M:file_close(Ref).
file_sync(Ref) ->
M = file_module(),
M:file_sync(Ref).
file_pread(Ref, Offset, Size) ->
M = file_module(),
M:file_pread(Ref, Offset, Size).
file_pwrite(Ref, Offset, Bytes) ->
M = file_module(),
M:file_pwrite(Ref, Offset, Bytes).
file_read(Ref, Size) ->
M = file_module(),
M:file_read(Ref, Size).
file_write(Ref, Bytes) ->
M = file_module(),
M:file_write(Ref, Bytes).
file_seekbof(Ref) ->
M = file_module(),
M:file_seekbof(Ref).
file_position(Ref, Position) ->
M = file_module(),
M:file_position(Ref, Position).
file_module() ->
case get(bitcask_file_mod) of
undefined ->
Mod = determine_file_module(),
put(bitcask_file_mod, Mod),
Mod;
Mod ->
Mod
end.
-ifdef(TEST).
determine_file_module() ->
case application:get_env(bitcask, io_mode) of
{ok, erlang} ->
bitcask_file;
{ok, nif} ->
bitcask_nifs;
_ ->
Mode = case os:getenv("BITCASK_IO_MODE") of
false -> 'erlang';
"erlang" -> 'erlang';
"nif" -> 'nif'
end,
application:set_env(bitcask, io_mode, Mode),
determine_file_module()
end.
-else.
determine_file_module() ->
case application:get_env(bitcask, io_mode) of
{ok, erlang} ->
bitcask_file;
{ok, nif} ->
bitcask_nifs;
_ ->
bitcask_file
end.
-endif.