| %% |
| %% 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_buffered_transport). |
| |
| -behaviour(thrift_transport). |
| |
| %% constructor |
| -export([new/1]). |
| %% protocol callbacks |
| -export([read/2, read_exact/2, write/2, flush/1, close/1]). |
| %% legacy api |
| -export([new_transport_factory/1]). |
| |
| |
| -record(t_buffered, { |
| wrapped, |
| write_buffer |
| }). |
| |
| -type state() :: #t_buffered{}. |
| |
| |
| -spec new(Transport::thrift_transport:t_transport()) -> |
| thrift_transport:t_transport(). |
| |
| new(Wrapped) -> |
| State = #t_buffered{ |
| wrapped = Wrapped, |
| write_buffer = [] |
| }, |
| thrift_transport:new(?MODULE, State). |
| |
| |
| -include("thrift_transport_behaviour.hrl"). |
| |
| |
| %% reads data through from the wrapped transport |
| read(State = #t_buffered{wrapped = Wrapped}, Len) |
| when is_integer(Len), Len >= 0 -> |
| {NewState, Response} = thrift_transport:read(Wrapped, Len), |
| {State#t_buffered{wrapped = NewState}, Response}. |
| |
| |
| %% reads data through from the wrapped transport |
| read_exact(State = #t_buffered{wrapped = Wrapped}, Len) |
| when is_integer(Len), Len >= 0 -> |
| {NewState, Response} = thrift_transport:read_exact(Wrapped, Len), |
| {State#t_buffered{wrapped = NewState}, Response}. |
| |
| |
| write(State = #t_buffered{write_buffer = Buffer}, Data) -> |
| {State#t_buffered{write_buffer = [Buffer, Data]}, ok}. |
| |
| |
| flush(State = #t_buffered{wrapped = Wrapped, write_buffer = Buffer}) -> |
| case iolist_size(Buffer) of |
| %% if write buffer is empty, do nothing |
| 0 -> {State, ok}; |
| _ -> |
| {Written, Response} = thrift_transport:write(Wrapped, Buffer), |
| {Flushed, ok} = thrift_transport:flush(Written), |
| {State#t_buffered{wrapped = Flushed, write_buffer = []}, Response} |
| end. |
| |
| |
| close(State = #t_buffered{wrapped = Wrapped}) -> |
| {Closed, Result} = thrift_transport:close(Wrapped), |
| {State#t_buffered{wrapped = Closed}, Result}. |
| |
| |
| %%-------------------------------------------------------------------- |
| %%% Internal functions |
| %%-------------------------------------------------------------------- |
| %%%% FACTORY GENERATION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| new_transport_factory(WrapFactory) -> |
| F = fun() -> |
| {ok, Wrapped} = WrapFactory(), |
| new(Wrapped) |
| end, |
| {ok, F}. |
| |