| %% |
| %% 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. |