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%%
%% Licensed to the Apache Software Foundation (ASF) under one
%% or more contributor license agreements. See the NOTICE file
%% distributed with this work for additional information
%% regarding copyright ownership. The ASF licenses this file
%% 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(thrift_file_transport).
-behaviour(thrift_transport).
-export([new_reader/1,
new/1,
new/2,
write/2, read/2, flush/1, close/1]).
-record(t_file_transport, {device,
should_close = true,
mode = write}).
%%%% CONSTRUCTION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
new_reader(Filename) ->
case file:open(Filename, [read, binary, {read_ahead, 1024*1024}]) of
{ok, IODevice} ->
new(IODevice, [{should_close, true}, {mode, read}]);
Error -> Error
end.
new(Device) ->
new(Device, []).
%% Device :: io_device()
%%
%% Device should be opened in raw and binary mode.
new(Device, Opts) when is_list(Opts) ->
State = parse_opts(Opts, #t_file_transport{device = Device}),
thrift_transport:new(?MODULE, State).
%% Parse options
parse_opts([{should_close, Bool} | Rest], State) when is_boolean(Bool) ->
parse_opts(Rest, State#t_file_transport{should_close = Bool});
parse_opts([{mode, Mode} | Rest], State)
when Mode =:= write;
Mode =:= read ->
parse_opts(Rest, State#t_file_transport{mode = Mode});
parse_opts([], State) ->
State.
%%%% TRANSPORT IMPL %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
write(#t_file_transport{device = Device, mode = write}, Data) ->
file:write(Device, Data);
write(_T, _D) ->
{error, read_mode}.
read(#t_file_transport{device = Device, mode = read}, Len)
when is_integer(Len), Len >= 0 ->
file:read(Device, Len);
read(_T, _D) ->
{error, read_mode}.
flush(#t_file_transport{device = Device, mode = write}) ->
file:sync(Device).
close(#t_file_transport{device = Device, should_close = SC}) ->
case SC of
true ->
file:close(Device);
false ->
ok
end.
|
