| %% |
| %% 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_memory_buffer). |
| |
| -behaviour(gen_server). |
| -behaviour(thrift_transport). |
| |
| %% API |
| -export([new/0, new_transport_factory/0]). |
| |
| %% gen_server callbacks |
| -export([init/1, handle_call/3, handle_cast/2, handle_info/2, |
| terminate/2, code_change/3]). |
| |
| %% thrift_transport callbacks |
| -export([write/2, read/2, flush/1, close/1]). |
| |
| -record(memory_buffer, {buffer}). |
| |
| %%==================================================================== |
| %% API |
| %%==================================================================== |
| new() -> |
| case gen_server:start_link(?MODULE, [], []) of |
| {ok, Pid} -> |
| thrift_transport:new(?MODULE, Pid); |
| Else -> |
| Else |
| end. |
| |
| new_transport_factory() -> |
| {ok, fun() -> new() end}. |
| |
| %%-------------------------------------------------------------------- |
| %% Function: write(Transport, Data) -> ok |
| %% |
| %% Data = iolist() |
| %% |
| %% Description: Writes data into the buffer |
| %%-------------------------------------------------------------------- |
| write(Transport, Data) -> |
| gen_server:call(Transport, {write, Data}). |
| |
| %%-------------------------------------------------------------------- |
| %% Function: flush(Transport) -> ok |
| %% |
| %% Description: Flushes the buffer through to the wrapped transport |
| %%-------------------------------------------------------------------- |
| flush(Transport) -> |
| gen_server:call(Transport, flush). |
| |
| %%-------------------------------------------------------------------- |
| %% Function: close(Transport) -> ok |
| %% |
| %% Description: Closes the transport and the wrapped transport |
| %%-------------------------------------------------------------------- |
| close(Transport) -> |
| gen_server:cast(Transport, close). |
| |
| %%-------------------------------------------------------------------- |
| %% Function: Read(Transport, Len) -> {ok, Data} |
| %% |
| %% Data = binary() |
| %% |
| %% Description: Reads data through from the wrapped transoprt |
| %%-------------------------------------------------------------------- |
| read(Transport, Len) when is_integer(Len) -> |
| gen_server:call(Transport, {read, Len}). |
| |
| %%==================================================================== |
| %% gen_server callbacks |
| %%==================================================================== |
| |
| %%-------------------------------------------------------------------- |
| %% Function: init(Args) -> {ok, State} | |
| %% {ok, State, Timeout} | |
| %% ignore | |
| %% {stop, Reason} |
| %% Description: Initiates the server |
| %%-------------------------------------------------------------------- |
| init([]) -> |
| {ok, #memory_buffer{buffer = []}}. |
| |
| %%-------------------------------------------------------------------- |
| %% Function: %% handle_call(Request, From, State) -> {reply, Reply, State} | |
| %% {reply, Reply, State, Timeout} | |
| %% {noreply, State} | |
| %% {noreply, State, Timeout} | |
| %% {stop, Reason, Reply, State} | |
| %% {stop, Reason, State} |
| %% Description: Handling call messages |
| %%-------------------------------------------------------------------- |
| handle_call({write, Data}, _From, State = #memory_buffer{buffer = Buf}) -> |
| {reply, ok, State#memory_buffer{buffer = [Buf, Data]}}; |
| |
| handle_call({read, Len}, _From, State = #memory_buffer{buffer = Buf}) -> |
| Binary = iolist_to_binary(Buf), |
| Give = min(iolist_size(Binary), Len), |
| {Result, Remaining} = split_binary(Binary, Give), |
| {reply, {ok, Result}, State#memory_buffer{buffer = Remaining}}; |
| |
| handle_call(flush, _From, State) -> |
| {reply, ok, State}. |
| |
| %%-------------------------------------------------------------------- |
| %% Function: handle_cast(Msg, State) -> {noreply, State} | |
| %% {noreply, State, Timeout} | |
| %% {stop, Reason, State} |
| %% Description: Handling cast messages |
| %%-------------------------------------------------------------------- |
| handle_cast(close, State) -> |
| {stop, normal, State}; |
| handle_cast(Msg, State=#memory_buffer{}) -> |
| {noreply, State}. |
| |
| %%-------------------------------------------------------------------- |
| %% Function: handle_info(Info, State) -> {noreply, State} | |
| %% {noreply, State, Timeout} | |
| %% {stop, Reason, State} |
| %% Description: Handling all non call/cast messages |
| %%-------------------------------------------------------------------- |
| handle_info(_Info, State) -> |
| {noreply, State}. |
| |
| %%-------------------------------------------------------------------- |
| %% Function: terminate(Reason, State) -> void() |
| %% Description: This function is called by a gen_server when it is about to |
| %% terminate. It should be the opposite of Module:init/1 and do any necessary |
| %% cleaning up. When it returns, the gen_server terminates with Reason. |
| %% The return value is ignored. |
| %%-------------------------------------------------------------------- |
| terminate(_Reason, _State) -> |
| ok. |
| |
| %%-------------------------------------------------------------------- |
| %% Func: code_change(OldVsn, State, Extra) -> {ok, NewState} |
| %% Description: Convert process state when code is changed |
| %%-------------------------------------------------------------------- |
| code_change(_OldVsn, State, _Extra) -> |
| {ok, State}. |
| |
| %%-------------------------------------------------------------------- |
| %%% Internal functions |
| %%-------------------------------------------------------------------- |
| min(A,B) when A<B -> A; |
| min(_,B) -> B. |
| |