% Copyright 2008 Konrad-Zuse-Zentrum f�r Informationstechnik Berlin
%
% Licensed 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.
%%%-------------------------------------------------------------------
%%% File : comm_port.erl
%%% Author : Thorsten Schuett <[email protected]>
%%% Description : Main CommLayer Interface
%%% Maps remote addresses to comm_connection PIDs.
%%%
%%% Created : 18 Apr 2008 by Thorsten Schuett <[email protected]>
%%%-------------------------------------------------------------------
%% @author Thorsten Schuett <[email protected]>
%% @copyright 2008 Konrad-Zuse-Zentrum f�r Informationstechnik Berlin
%% @version $Id $
-module(comm_layer_dir.comm_port).
-author('[email protected]').
-vsn('$Id: comm_port.erl,v 1.1 2009/11/06 12:41:36 maria Exp $ ').
-behaviour(gen_server).
-import(ets).
-import(gen_server).
-import(io).
-import(log).
-define(ASYNC, true).
%-define(SYNC, true).
%% API
-export([start_link/0,
send/2,
unregister_connection/2, register_connection/4,
set_local_address/2, get_local_address_port/0]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
%%====================================================================
%% API
%%====================================================================
%% @doc
%% @spec send({inet:ip_address(), int(), pid()}, term()) -> ok
-ifdef(ASYNC).
send({Address, Port, Pid}, Message) ->
gen_server:call(?MODULE, {send, Address, Port, Pid, Message}, 20000).
-endif.
-ifdef(SYNC).
send({Address, Port, Pid}, Message) ->
case ets:lookup(?MODULE, {Address, Port}) of
[{{Address, Port}, {_LPid, Socket}}] ->
comm_connection:send({Address, Port, Socket}, Pid, Message),
ok;
[] ->
gen_server:call(?MODULE, {send, Address, Port, Pid, Message}, 20000)
end.
-endif.
%% @doc
%% @spec unregister_connection(inet:ip_address(), int()) -> ok
unregister_connection(Adress, Port) ->
gen_server:call(?MODULE, {unregister_conn, Adress, Port}, 20000).
%% @doc
%% @spec register_connection(inet:ip_address(), int(), pid(), gen_tcp:socket()) -> ok | duplicate
register_connection(Adress, Port, Pid, Socket) ->
gen_server:call(?MODULE, {register_conn, Adress, Port, Pid, Socket}, 20000).
%% @doc
%% @spec set_local_address(inet:ip_address(), int()) -> ok
set_local_address(Address, Port) ->
gen_server:call(?MODULE, {set_local_address, Address, Port}, 20000).
%% @doc
%% @spec get_local_address_port() -> {inet:ip_address(),int()}
get_local_address_port() ->
case ets:lookup(?MODULE, local_address_port) of
[{local_address_port, Value}] ->
Value;
[] ->
undefined
end.
%%--------------------------------------------------------------------
%% Function: start_link() -> {ok,Pid} | ignore | {error,Error}
%% Description: Starts the server
%%--------------------------------------------------------------------
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
%%====================================================================
%% gen_server callbacks
%%====================================================================
%%--------------------------------------------------------------------
%% Function: init(Args) -> {ok, State} |
%% {ok, State, Timeout} |
%% ignore |
%% {stop, Reason}
%% Description: Initiates the server
%%--------------------------------------------------------------------
init([]) ->
ets:new(?MODULE, [set, protected, named_table]),
{ok, ok}. % empty state.
%%--------------------------------------------------------------------
%% 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({send, Address, Port, Pid, Message}, _From, State) ->
send(Address, Port, Pid, Message, State);
handle_call({unregister_conn, Address, Port}, _From, State) ->
ets:delete(?MODULE, {Address, Port}),
{reply, ok, State};
handle_call({register_conn, Address, Port, Pid, Socket}, _From, State) ->
case ets:lookup(?MODULE, {Address, Port}) of
[{{Address, Port}, _}] ->
{reply, duplicate, State};
[] ->
ets:insert(?MODULE, {{Address, Port}, {Pid, Socket}}),
{reply, ok, State}
end;
handle_call({set_local_address, Address, Port}, _From, State) ->
ets:insert(?MODULE, {local_address_port, {Address,Port}}),
{reply, ok, State}.
%%--------------------------------------------------------------------
%% Function: handle_cast(Msg, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% Description: Handling cast messages
%%--------------------------------------------------------------------
handle_cast(_Msg, State) ->
{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
%%--------------------------------------------------------------------
-ifdef(ASYNC).
send(Address, Port, Pid, Message, State) ->
{DepAddr,DepPort} = get_local_address_port(),
if
DepAddr == undefined ->
open_sync_connection(Address, Port, Pid, Message, State);
true ->
case ets:lookup(?MODULE, {Address, Port}) of
[{{Address, Port}, {ConnPid, _Socket}}] ->
ConnPid ! {send, Pid, Message},
{reply, ok, State};
[] ->
ConnPid = comm_connection:open_new_async(Address, Port,
DepAddr, DepPort),
ets:insert(?MODULE, {{Address, Port}, {ConnPid, undef}}),
ConnPid ! {send, Pid, Message},
{reply, ok, State}
end
end.
-endif.
-ifdef(SYNC).
send(Address, Port, Pid, Message, State) ->
case ets:lookup(?MODULE, {Address, Port}) of
[{{Address, Port}, {_LPid, Socket}}] ->
comm_connection:send({Address, Port, Socket}, Pid, Message),
{reply, ok, State};
[] ->
open_sync_connection(Address, Port, Pid, Message, State)
end.
-endif.
open_sync_connection(Address, Port, Pid, Message, State) ->
{DepAddr,DepPort} = get_local_address_port(),
case comm_connection:open_new(Address, Port, DepAddr, DepPort) of
{local_ip, MyIP, MyPort, MyPid, MySocket} ->
comm_connection:send({Address, Port, MySocket}, Pid, Message),
log:log(info,"[ CC ] this() == ~w", [{MyIP, MyPort}]),
% set_local_address(t, {MyIP,MyPort}}),
% register_connection(Address, Port, MyPid, MySocket),
ets:insert(?MODULE, {local_address_port, {MyIP,MyPort}}),
ets:insert(?MODULE, {{Address, Port}, {MyPid, MySocket}}),
{reply, ok, State};
fail ->
% drop message (remote node not reachable, failure detector will notice)
{reply, ok, State};
{connection, LocalPid, NewSocket} ->
comm_connection:send({Address, Port, NewSocket}, Pid, Message),
ets:insert(?MODULE, {{Address, Port}, {LocalPid, NewSocket}}),
% register_connection(Address, Port, LPid, NewSocket),
{reply, ok, State}
end.
