選択できるのは25トピックまでです。
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214 行
7.3 KiB
214 行
7.3 KiB
%%%-------------------------------------------------------------------
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%%% File : ibrowse_lb.erl
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%%% Author : chandru <chandrashekhar.mullaparthi@t-mobile.co.uk>
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%%% Description :
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%%%
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%%% Created : 6 Mar 2008 by chandru <chandrashekhar.mullaparthi@t-mobile.co.uk>
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%%%-------------------------------------------------------------------
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-module(ibrowse_lb).
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-author(chandru).
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-behaviour(gen_server).
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%%--------------------------------------------------------------------
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%% Include files
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%%--------------------------------------------------------------------
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%%--------------------------------------------------------------------
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%% External exports
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-export([
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start_link/1,
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spawn_connection/5
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]).
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%% gen_server callbacks
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-export([
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init/1,
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handle_call/3,
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handle_cast/2,
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handle_info/2,
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terminate/2,
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code_change/3
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]).
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-record(state, {parent_pid,
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ets_tid,
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host,
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port,
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max_sessions,
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max_pipeline_size,
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num_cur_sessions = 0}).
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-include("ibrowse.hrl").
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%%====================================================================
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%% External functions
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%%====================================================================
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%%--------------------------------------------------------------------
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%% Function: start_link/0
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%% Description: Starts the server
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%%--------------------------------------------------------------------
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start_link(Args) ->
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gen_server:start_link(?MODULE, Args, []).
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%%====================================================================
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%% Server functions
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%%====================================================================
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%%--------------------------------------------------------------------
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%% Function: init/1
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%% Description: Initiates the server
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%% Returns: {ok, State} |
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%% {ok, State, Timeout} |
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%% ignore |
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%% {stop, Reason}
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%%--------------------------------------------------------------------
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init([Host, Port]) ->
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process_flag(trap_exit, true),
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Max_sessions = ibrowse:get_config_value({max_sessions, Host, Port}, 10),
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Max_pipe_sz = ibrowse:get_config_value({max_pipeline_size, Host, Port}, 10),
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put(my_trace_flag, ibrowse_lib:get_trace_status(Host, Port)),
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put(ibrowse_trace_token, ["LB: ", Host, $:, integer_to_list(Port)]),
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Tid = ets:new(ibrowse_lb, [public, ordered_set]),
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{ok, #state{parent_pid = whereis(ibrowse),
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host = Host,
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port = Port,
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ets_tid = Tid,
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max_pipeline_size = Max_pipe_sz,
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max_sessions = Max_sessions}}.
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spawn_connection(Lb_pid, Url,
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Max_sessions,
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Max_pipeline_size,
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SSL_options)
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when is_pid(Lb_pid),
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is_record(Url, url),
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is_integer(Max_pipeline_size),
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is_integer(Max_sessions) ->
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gen_server:call(Lb_pid,
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{spawn_connection, Url, Max_sessions, Max_pipeline_size, SSL_options}).
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%%--------------------------------------------------------------------
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%% Function: handle_call/3
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%% Description: Handling call messages
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%% Returns: {reply, Reply, State} |
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%% {reply, Reply, State, Timeout} |
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%% {noreply, State} |
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%% {noreply, State, Timeout} |
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%% {stop, Reason, Reply, State} | (terminate/2 is called)
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%% {stop, Reason, State} (terminate/2 is called)
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%%--------------------------------------------------------------------
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% handle_call({spawn_connection, _Url, Max_sess, Max_pipe, _}, _From,
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% #state{max_sessions = Max_sess,
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% ets_tid = Tid,
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% max_pipeline_size = Max_pipe_sz,
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% num_cur_sessions = Num} = State)
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% when Num >= Max ->
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% Reply = find_best_connection(Tid),
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% {reply, sorry_dude_reuse, State};
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%% Update max_sessions in #state with supplied value
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handle_call({spawn_connection, _Url, Max_sess, Max_pipe, _}, _From,
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#state{num_cur_sessions = Num} = State)
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when Num >= Max_sess ->
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State_1 = maybe_create_ets(State),
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Reply = find_best_connection(State_1#state.ets_tid, Max_pipe),
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{reply, Reply, State_1#state{max_sessions = Max_sess}};
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handle_call({spawn_connection, Url, _Max_sess, _Max_pipe, SSL_options}, _From,
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#state{num_cur_sessions = Cur} = State) ->
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State_1 = maybe_create_ets(State),
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Tid = State_1#state.ets_tid,
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{ok, Pid} = ibrowse_http_client:start_link({Tid, Url, SSL_options}),
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ets:insert(Tid, {{1, Pid}, []}),
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{reply, {ok, Pid}, State_1#state{num_cur_sessions = Cur + 1}};
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handle_call(Request, _From, State) ->
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Reply = {unknown_request, Request},
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{reply, Reply, State}.
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%%--------------------------------------------------------------------
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%% Function: handle_cast/2
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%% Description: Handling cast messages
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%% Returns: {noreply, State} |
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%% {noreply, State, Timeout} |
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%% {stop, Reason, State} (terminate/2 is called)
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%%--------------------------------------------------------------------
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handle_cast(_Msg, State) ->
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{noreply, State}.
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%%--------------------------------------------------------------------
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%% Function: handle_info/2
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%% Description: Handling all non call/cast messages
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%% Returns: {noreply, State} |
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%% {noreply, State, Timeout} |
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%% {stop, Reason, State} (terminate/2 is called)
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%%--------------------------------------------------------------------
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handle_info({'EXIT', Parent, _Reason}, #state{parent_pid = Parent} = State) ->
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{stop, normal, State};
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handle_info({'EXIT', _Pid, _Reason}, #state{ets_tid = undefined} = State) ->
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{noreply, State};
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handle_info({'EXIT', Pid, _Reason},
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#state{num_cur_sessions = Cur,
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ets_tid = Tid} = State) ->
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ets:match_delete(Tid, {{'_', Pid}, '_'}),
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Cur_1 = Cur - 1,
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State_1 = case Cur_1 of
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0 ->
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ets:delete(Tid),
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State#state{ets_tid = undefined};
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_ ->
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State
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end,
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{noreply, State_1#state{num_cur_sessions = Cur_1}};
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handle_info({trace, Bool}, #state{ets_tid = undefined} = State) ->
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put(my_trace_flag, Bool),
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{noreply, State};
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handle_info({trace, Bool}, #state{ets_tid = Tid} = State) ->
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ets:foldl(fun({{_, Pid}, _}, Acc) when is_pid(Pid) ->
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catch Pid ! {trace, Bool},
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Acc;
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(_, Acc) ->
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Acc
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end, undefined, Tid),
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put(my_trace_flag, Bool),
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{noreply, State};
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handle_info(_Info, State) ->
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{noreply, State}.
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%%--------------------------------------------------------------------
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%% Function: terminate/2
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%% Description: Shutdown the server
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%% Returns: any (ignored by gen_server)
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%%--------------------------------------------------------------------
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terminate(_Reason, _State) ->
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ok.
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%%--------------------------------------------------------------------
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%% Func: code_change/3
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%% Purpose: Convert process state when code is changed
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%% Returns: {ok, NewState}
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%%--------------------------------------------------------------------
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code_change(_OldVsn, State, _Extra) ->
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{ok, State}.
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%%--------------------------------------------------------------------
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%%% Internal functions
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%%--------------------------------------------------------------------
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find_best_connection(Tid, Max_pipe) ->
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case ets:first(Tid) of
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{Cur_sz, Pid} when Cur_sz < Max_pipe ->
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ets:delete(Tid, {Cur_sz, Pid}),
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ets:insert(Tid, {{Cur_sz + 1, Pid}, []}),
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{ok, Pid};
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_ ->
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{error, retry_later}
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end.
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maybe_create_ets(#state{ets_tid = undefined} = State) ->
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Tid = ets:new(ibrowse_lb, [public, ordered_set]),
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State#state{ets_tid = Tid};
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maybe_create_ets(State) ->
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State.
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