% Copyright 2008 Konrad-Zuse-Zentrum für 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_logger.erl
%%% Author : Thorsten Schuett <[email protected]>
%%% Description :
%%%
%%% Created : 31 Jul 2008 by Thorsten Schuett <[email protected]>
%%%-------------------------------------------------------------------
%% @author Thorsten Schuett <[email protected]>
%% @copyright 2008 Konrad-Zuse-Zentrum für Informationstechnik Berlin
%% @version $Id: comm_logger.erl,v 1.1 2009/11/06 12:41:36 maria Exp $
-module(comm_layer_dir.comm_logger).
-author('[email protected]').
-vsn('$Id: comm_logger.erl,v 1.1 2009/11/06 12:41:36 maria Exp $ ').
-behaviour(gen_server).
-import(gb_trees).
-import(gen_server).
%% API
-export([start_link/0]).
-export([log/2, dump/0]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-record(state, {start, map}).
%%====================================================================
%% API
%%====================================================================
%%--------------------------------------------------------------------
%% Function: start_link() -> {ok,Pid} | ignore | {error,Error}
%% Description: Starts the server
%%--------------------------------------------------------------------
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
%%--------------------------------------------------------------------
%% Function: log(Tag, Size) -> ok
%% Description: logs a message type with its size
%%--------------------------------------------------------------------
log(Tag, Size) ->
gen_server:cast(?MODULE, {log, Tag, Size}).
%%--------------------------------------------------------------------
%% Function: dump() -> {gb_tree:gb_trees(), {Date, Time}}
%% Description: gets the logging state
%%--------------------------------------------------------------------
dump() ->
gen_server:call(?MODULE, {dump}).
%%====================================================================
%% gen_server callbacks
%%====================================================================
%%--------------------------------------------------------------------
%% Function: init(Args) -> {ok, State} |
%% {ok, State, Timeout} |
%% ignore |
%% {stop, Reason}
%% Description: Initiates the server
%%--------------------------------------------------------------------
init([]) ->
{ok, #state{start=erlang:now(), map=gb_trees:empty()}}.
%%--------------------------------------------------------------------
%% 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({dump}, _From, State) ->
Reply = {State#state.map, State#state.start},
{reply, Reply, State};
handle_call(_Request, _From, State) ->
Reply = ok,
{reply, Reply, State}.
%%--------------------------------------------------------------------
%% Function: handle_cast(Msg, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% Description: Handling cast messages
%%--------------------------------------------------------------------
handle_cast({log, Tag, Size}, State) ->
case gb_trees:lookup(Tag, State#state.map) of
none ->
{noreply, State#state{map=gb_trees:insert(Tag, {Size, 1}, State#state.map)}};
{value, {OldSize, OldCount}} ->
{noreply, State#state{map=gb_trees:update(Tag, {Size + OldSize, OldCount + 1}, State#state.map)}}
end;
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
%%--------------------------------------------------------------------
