mirror of
https://github.com/processone/ejabberd.git
synced 2024-11-22 16:20:52 +01:00
f09509502e
* doc/guide.html: Likewise * src/*/*.erl: Likewise * src/*/*.erl: Remove unneeded blankspaces in license text SVN Revision: 1804
684 lines
24 KiB
Erlang
684 lines
24 KiB
Erlang
%% ``The contents of this file are subject to the Erlang Public License,
|
|
%% Version 1.1, (the "License"); you may not use this file except in
|
|
%% compliance with the License. You should have received a copy of the
|
|
%% Erlang Public License along with this software. If not, it can be
|
|
%% retrieved via the world wide web at http://www.erlang.org/.
|
|
%%
|
|
%% Software distributed under the License is distributed on an "AS IS"
|
|
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
|
|
%% the License for the specific language governing rights and limitations
|
|
%% under the License.
|
|
%%
|
|
%% The Initial Developer of the Original Code is Ericsson Utvecklings AB.
|
|
%% Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings
|
|
%% AB. All Rights Reserved.''
|
|
%%
|
|
%% The code has been modified and improved by ProcessOne.
|
|
%% Copyright 2007-2009, ProcessOne
|
|
%%
|
|
%% The change adds the following features:
|
|
%% - You can send exit(priority_shutdown) to the p1_fsm process to
|
|
%% terminate immediatetly. If the fsm trap_exit process flag has been
|
|
%% set to true, the FSM terminate function will called.
|
|
%% - You can pass the gen_fsm options to control resource usage.
|
|
%% {max_messages, N} will exit the process with priority_shutdown
|
|
%% - You can limit the time processing a message (TODO): If the
|
|
%% message processing does not return in a given period of time, the
|
|
%% process will be terminated.
|
|
%%
|
|
%% $Id$
|
|
%%
|
|
-module(p1_fsm).
|
|
|
|
%%%-----------------------------------------------------------------
|
|
%%%
|
|
%%% This state machine is somewhat more pure than state_lib. It is
|
|
%%% still based on State dispatching (one function per state), but
|
|
%%% allows a function handle_event to take care of events in all states.
|
|
%%% It's not that pure anymore :( We also allow synchronized event sending.
|
|
%%%
|
|
%%% If the Parent process terminates the Module:terminate/2
|
|
%%% function is called.
|
|
%%%
|
|
%%% The user module should export:
|
|
%%%
|
|
%%% init(Args)
|
|
%%% ==> {ok, StateName, StateData}
|
|
%%% {ok, StateName, StateData, Timeout}
|
|
%%% ignore
|
|
%%% {stop, Reason}
|
|
%%%
|
|
%%% StateName(Msg, StateData)
|
|
%%%
|
|
%%% ==> {next_state, NewStateName, NewStateData}
|
|
%%% {next_state, NewStateName, NewStateData, Timeout}
|
|
%%% {stop, Reason, NewStateData}
|
|
%%% Reason = normal | shutdown | Term terminate(State) is called
|
|
%%%
|
|
%%% StateName(Msg, From, StateData)
|
|
%%%
|
|
%%% ==> {next_state, NewStateName, NewStateData}
|
|
%%% {next_state, NewStateName, NewStateData, Timeout}
|
|
%%% {reply, Reply, NewStateName, NewStateData}
|
|
%%% {reply, Reply, NewStateName, NewStateData, Timeout}
|
|
%%% {stop, Reason, NewStateData}
|
|
%%% Reason = normal | shutdown | Term terminate(State) is called
|
|
%%%
|
|
%%% handle_event(Msg, StateName, StateData)
|
|
%%%
|
|
%%% ==> {next_state, NewStateName, NewStateData}
|
|
%%% {next_state, NewStateName, NewStateData, Timeout}
|
|
%%% {stop, Reason, Reply, NewStateData}
|
|
%%% {stop, Reason, NewStateData}
|
|
%%% Reason = normal | shutdown | Term terminate(State) is called
|
|
%%%
|
|
%%% handle_sync_event(Msg, From, StateName, StateData)
|
|
%%%
|
|
%%% ==> {next_state, NewStateName, NewStateData}
|
|
%%% {next_state, NewStateName, NewStateData, Timeout}
|
|
%%% {reply, Reply, NewStateName, NewStateData}
|
|
%%% {reply, Reply, NewStateName, NewStateData, Timeout}
|
|
%%% {stop, Reason, Reply, NewStateData}
|
|
%%% {stop, Reason, NewStateData}
|
|
%%% Reason = normal | shutdown | Term terminate(State) is called
|
|
%%%
|
|
%%% handle_info(Info, StateName) (e.g. {'EXIT', P, R}, {nodedown, N}, ...
|
|
%%%
|
|
%%% ==> {next_state, NewStateName, NewStateData}
|
|
%%% {next_state, NewStateName, NewStateData, Timeout}
|
|
%%% {stop, Reason, NewStateData}
|
|
%%% Reason = normal | shutdown | Term terminate(State) is called
|
|
%%%
|
|
%%% terminate(Reason, StateName, StateData) Let the user module clean up
|
|
%%% always called when server terminates
|
|
%%%
|
|
%%% ==> the return value is ignored
|
|
%%%
|
|
%%%
|
|
%%% The work flow (of the fsm) can be described as follows:
|
|
%%%
|
|
%%% User module fsm
|
|
%%% ----------- -------
|
|
%%% start -----> start
|
|
%%% init <----- .
|
|
%%%
|
|
%%% loop
|
|
%%% StateName <----- .
|
|
%%%
|
|
%%% handle_event <----- .
|
|
%%%
|
|
%%% handle__sunc_event <----- .
|
|
%%%
|
|
%%% handle_info <----- .
|
|
%%%
|
|
%%% terminate <----- .
|
|
%%%
|
|
%%%
|
|
%%% ---------------------------------------------------
|
|
|
|
-export([start/3, start/4,
|
|
start_link/3, start_link/4,
|
|
send_event/2, sync_send_event/2, sync_send_event/3,
|
|
send_all_state_event/2,
|
|
sync_send_all_state_event/2, sync_send_all_state_event/3,
|
|
reply/2,
|
|
start_timer/2,send_event_after/2,cancel_timer/1,
|
|
enter_loop/4, enter_loop/5, enter_loop/6]).
|
|
|
|
-export([behaviour_info/1]).
|
|
|
|
%% Internal exports
|
|
-export([init_it/6, print_event/3,
|
|
system_continue/3,
|
|
system_terminate/4,
|
|
system_code_change/4,
|
|
format_status/2]).
|
|
|
|
-import(error_logger , [format/2]).
|
|
|
|
%%% Internal gen_fsm state
|
|
%%% This state is used to defined resource control values:
|
|
-record(limits, {max_queue}).
|
|
|
|
%%% ---------------------------------------------------
|
|
%%% Interface functions.
|
|
%%% ---------------------------------------------------
|
|
|
|
behaviour_info(callbacks) ->
|
|
[{init,1},{handle_event,3},{handle_sync_event,4},{handle_info,3},
|
|
{terminate,3},{code_change,4}];
|
|
behaviour_info(_Other) ->
|
|
undefined.
|
|
|
|
%%% ---------------------------------------------------
|
|
%%% Starts a generic state machine.
|
|
%%% start(Mod, Args, Options)
|
|
%%% start(Name, Mod, Args, Options)
|
|
%%% start_link(Mod, Args, Options)
|
|
%%% start_link(Name, Mod, Args, Options) where:
|
|
%%% Name ::= {local, atom()} | {global, atom()}
|
|
%%% Mod ::= atom(), callback module implementing the 'real' fsm
|
|
%%% Args ::= term(), init arguments (to Mod:init/1)
|
|
%%% Options ::= [{debug, [Flag]}]
|
|
%%% Flag ::= trace | log | {logfile, File} | statistics | debug
|
|
%%% (debug == log && statistics)
|
|
%%% Returns: {ok, Pid} |
|
|
%%% {error, {already_started, Pid}} |
|
|
%%% {error, Reason}
|
|
%%% ---------------------------------------------------
|
|
start(Mod, Args, Options) ->
|
|
gen:start(?MODULE, nolink, Mod, Args, Options).
|
|
|
|
start(Name, Mod, Args, Options) ->
|
|
gen:start(?MODULE, nolink, Name, Mod, Args, Options).
|
|
|
|
start_link(Mod, Args, Options) ->
|
|
gen:start(?MODULE, link, Mod, Args, Options).
|
|
|
|
start_link(Name, Mod, Args, Options) ->
|
|
gen:start(?MODULE, link, Name, Mod, Args, Options).
|
|
|
|
|
|
send_event({global, Name}, Event) ->
|
|
catch global:send(Name, {'$gen_event', Event}),
|
|
ok;
|
|
send_event(Name, Event) ->
|
|
Name ! {'$gen_event', Event},
|
|
ok.
|
|
|
|
sync_send_event(Name, Event) ->
|
|
case catch gen:call(Name, '$gen_sync_event', Event) of
|
|
{ok,Res} ->
|
|
Res;
|
|
{'EXIT',Reason} ->
|
|
exit({Reason, {?MODULE, sync_send_event, [Name, Event]}})
|
|
end.
|
|
|
|
sync_send_event(Name, Event, Timeout) ->
|
|
case catch gen:call(Name, '$gen_sync_event', Event, Timeout) of
|
|
{ok,Res} ->
|
|
Res;
|
|
{'EXIT',Reason} ->
|
|
exit({Reason, {?MODULE, sync_send_event, [Name, Event, Timeout]}})
|
|
end.
|
|
|
|
send_all_state_event({global, Name}, Event) ->
|
|
catch global:send(Name, {'$gen_all_state_event', Event}),
|
|
ok;
|
|
send_all_state_event(Name, Event) ->
|
|
Name ! {'$gen_all_state_event', Event},
|
|
ok.
|
|
|
|
sync_send_all_state_event(Name, Event) ->
|
|
case catch gen:call(Name, '$gen_sync_all_state_event', Event) of
|
|
{ok,Res} ->
|
|
Res;
|
|
{'EXIT',Reason} ->
|
|
exit({Reason, {?MODULE, sync_send_all_state_event, [Name, Event]}})
|
|
end.
|
|
|
|
sync_send_all_state_event(Name, Event, Timeout) ->
|
|
case catch gen:call(Name, '$gen_sync_all_state_event', Event, Timeout) of
|
|
{ok,Res} ->
|
|
Res;
|
|
{'EXIT',Reason} ->
|
|
exit({Reason, {?MODULE, sync_send_all_state_event,
|
|
[Name, Event, Timeout]}})
|
|
end.
|
|
|
|
%% Designed to be only callable within one of the callbacks
|
|
%% hence using the self() of this instance of the process.
|
|
%% This is to ensure that timers don't go astray in global
|
|
%% e.g. when straddling a failover, or turn up in a restarted
|
|
%% instance of the process.
|
|
|
|
%% Returns Ref, sends event {timeout,Ref,Msg} after Time
|
|
%% to the (then) current state.
|
|
start_timer(Time, Msg) ->
|
|
erlang:start_timer(Time, self(), {'$gen_timer', Msg}).
|
|
|
|
%% Returns Ref, sends Event after Time to the (then) current state.
|
|
send_event_after(Time, Event) ->
|
|
erlang:start_timer(Time, self(), {'$gen_event', Event}).
|
|
|
|
%% Returns the remaing time for the timer if Ref referred to
|
|
%% an active timer/send_event_after, false otherwise.
|
|
cancel_timer(Ref) ->
|
|
case erlang:cancel_timer(Ref) of
|
|
false ->
|
|
receive {timeout, Ref, _} -> 0
|
|
after 0 -> false
|
|
end;
|
|
RemainingTime ->
|
|
RemainingTime
|
|
end.
|
|
|
|
%% enter_loop/4,5,6
|
|
%% Makes an existing process into a gen_fsm.
|
|
%% The calling process will enter the gen_fsm receive loop and become a
|
|
%% gen_fsm process.
|
|
%% The process *must* have been started using one of the start functions
|
|
%% in proc_lib, see proc_lib(3).
|
|
%% The user is responsible for any initialization of the process,
|
|
%% including registering a name for it.
|
|
enter_loop(Mod, Options, StateName, StateData) ->
|
|
enter_loop(Mod, Options, StateName, StateData, self(), infinity).
|
|
|
|
enter_loop(Mod, Options, StateName, StateData, ServerName = {_,_}) ->
|
|
enter_loop(Mod, Options, StateName, StateData, ServerName,infinity);
|
|
enter_loop(Mod, Options, StateName, StateData, Timeout) ->
|
|
enter_loop(Mod, Options, StateName, StateData, self(), Timeout).
|
|
|
|
enter_loop(Mod, Options, StateName, StateData, ServerName, Timeout) ->
|
|
Name = get_proc_name(ServerName),
|
|
Parent = get_parent(),
|
|
Debug = gen:debug_options(Options),
|
|
Limits= limit_options(Options),
|
|
loop(Parent, Name, StateName, StateData, Mod, Timeout, Debug, Limits).
|
|
|
|
get_proc_name(Pid) when is_pid(Pid) ->
|
|
Pid;
|
|
get_proc_name({local, Name}) ->
|
|
case process_info(self(), registered_name) of
|
|
{registered_name, Name} ->
|
|
Name;
|
|
{registered_name, _Name} ->
|
|
exit(process_not_registered);
|
|
[] ->
|
|
exit(process_not_registered)
|
|
end;
|
|
get_proc_name({global, Name}) ->
|
|
case global:safe_whereis_name(Name) of
|
|
undefined ->
|
|
exit(process_not_registered_globally);
|
|
Pid when Pid==self() ->
|
|
Name;
|
|
_Pid ->
|
|
exit(process_not_registered_globally)
|
|
end.
|
|
|
|
get_parent() ->
|
|
case get('$ancestors') of
|
|
[Parent | _] when is_pid(Parent) ->
|
|
Parent;
|
|
[Parent | _] when is_atom(Parent) ->
|
|
name_to_pid(Parent);
|
|
_ ->
|
|
exit(process_was_not_started_by_proc_lib)
|
|
end.
|
|
|
|
name_to_pid(Name) ->
|
|
case whereis(Name) of
|
|
undefined ->
|
|
case global:safe_whereis_name(Name) of
|
|
undefined ->
|
|
exit(could_not_find_registerd_name);
|
|
Pid ->
|
|
Pid
|
|
end;
|
|
Pid ->
|
|
Pid
|
|
end.
|
|
|
|
%%% ---------------------------------------------------
|
|
%%% Initiate the new process.
|
|
%%% Register the name using the Rfunc function
|
|
%%% Calls the Mod:init/Args function.
|
|
%%% Finally an acknowledge is sent to Parent and the main
|
|
%%% loop is entered.
|
|
%%% ---------------------------------------------------
|
|
init_it(Starter, self, Name, Mod, Args, Options) ->
|
|
init_it(Starter, self(), Name, Mod, Args, Options);
|
|
init_it(Starter, Parent, Name, Mod, Args, Options) ->
|
|
Debug = gen:debug_options(Options),
|
|
Limits= limit_options(Options),
|
|
case catch Mod:init(Args) of
|
|
{ok, StateName, StateData} ->
|
|
proc_lib:init_ack(Starter, {ok, self()}),
|
|
loop(Parent, Name, StateName, StateData, Mod, infinity, Debug, Limits);
|
|
{ok, StateName, StateData, Timeout} ->
|
|
proc_lib:init_ack(Starter, {ok, self()}),
|
|
loop(Parent, Name, StateName, StateData, Mod, Timeout, Debug, Limits);
|
|
{stop, Reason} ->
|
|
proc_lib:init_ack(Starter, {error, Reason}),
|
|
exit(Reason);
|
|
ignore ->
|
|
proc_lib:init_ack(Starter, ignore),
|
|
exit(normal);
|
|
{'EXIT', Reason} ->
|
|
proc_lib:init_ack(Starter, {error, Reason}),
|
|
exit(Reason);
|
|
Else ->
|
|
Error = {bad_return_value, Else},
|
|
proc_lib:init_ack(Starter, {error, Error}),
|
|
exit(Error)
|
|
end.
|
|
|
|
%%-----------------------------------------------------------------
|
|
%% The MAIN loop
|
|
%%-----------------------------------------------------------------
|
|
%% First we test if we have reach a defined limit ...
|
|
loop(Parent, Name, StateName, StateData, Mod, Time, Debug, Limits) ->
|
|
try
|
|
message_queue_len(Limits)
|
|
%% TODO: We can add more limit checking here...
|
|
catch
|
|
{process_limit, Limit} ->
|
|
Reason = {process_limit, Limit},
|
|
Msg = {'EXIT', Parent, {error, {process_limit, Limit}}},
|
|
terminate(Reason, Name, Msg, Mod, StateName, StateData, Debug)
|
|
end,
|
|
process_message(Parent, Name, StateName, StateData,
|
|
Mod, Time, Debug, Limits).
|
|
%% ... then we can process a new message:
|
|
process_message(Parent, Name, StateName, StateData, Mod, Time, Debug, Limits) ->
|
|
Msg = receive
|
|
{'EXIT', Parent, priority_shutdown} ->
|
|
{'EXIT', Parent, priority_shutdown}
|
|
after 0 ->
|
|
receive
|
|
Input ->
|
|
Input
|
|
after Time ->
|
|
{'$gen_event', timeout}
|
|
end
|
|
end,
|
|
case Msg of
|
|
{system, From, Req} ->
|
|
sys:handle_system_msg(Req, From, Parent, ?MODULE, Debug,
|
|
[Name, StateName, StateData,
|
|
Mod, Time, Limits]);
|
|
{'EXIT', Parent, Reason} ->
|
|
terminate(Reason, Name, Msg, Mod, StateName, StateData, Debug);
|
|
_Msg when Debug == [] ->
|
|
handle_msg(Msg, Parent, Name, StateName, StateData,
|
|
Mod, Time, Limits);
|
|
_Msg ->
|
|
Debug1 = sys:handle_debug(Debug, {?MODULE, print_event},
|
|
{Name, StateName}, {in, Msg}),
|
|
handle_msg(Msg, Parent, Name, StateName, StateData,
|
|
Mod, Time, Debug1, Limits)
|
|
end.
|
|
|
|
%%-----------------------------------------------------------------
|
|
%% Callback functions for system messages handling.
|
|
%%-----------------------------------------------------------------
|
|
%% TODO: Fix me
|
|
system_continue(Parent, Debug, [Name, StateName, StateData,
|
|
Mod, Time, Limits]) ->
|
|
loop(Parent, Name, StateName, StateData, Mod, Time, Debug, Limits).
|
|
|
|
system_terminate(Reason, _Parent, Debug,
|
|
[Name, StateName, StateData, Mod, _Time, _Limits]) ->
|
|
terminate(Reason, Name, [], Mod, StateName, StateData, Debug).
|
|
|
|
system_code_change([Name, StateName, StateData, Mod, Time, Limits],
|
|
_Module, OldVsn, Extra) ->
|
|
case catch Mod:code_change(OldVsn, StateName, StateData, Extra) of
|
|
{ok, NewStateName, NewStateData} ->
|
|
{ok, [Name, NewStateName, NewStateData, Mod, Time, Limits]};
|
|
Else -> Else
|
|
end.
|
|
|
|
%%-----------------------------------------------------------------
|
|
%% Format debug messages. Print them as the call-back module sees
|
|
%% them, not as the real erlang messages. Use trace for that.
|
|
%%-----------------------------------------------------------------
|
|
print_event(Dev, {in, Msg}, {Name, StateName}) ->
|
|
case Msg of
|
|
{'$gen_event', Event} ->
|
|
io:format(Dev, "*DBG* ~p got event ~p in state ~w~n",
|
|
[Name, Event, StateName]);
|
|
{'$gen_all_state_event', Event} ->
|
|
io:format(Dev,
|
|
"*DBG* ~p got all_state_event ~p in state ~w~n",
|
|
[Name, Event, StateName]);
|
|
{timeout, Ref, {'$gen_timer', Message}} ->
|
|
io:format(Dev,
|
|
"*DBG* ~p got timer ~p in state ~w~n",
|
|
[Name, {timeout, Ref, Message}, StateName]);
|
|
{timeout, _Ref, {'$gen_event', Event}} ->
|
|
io:format(Dev,
|
|
"*DBG* ~p got timer ~p in state ~w~n",
|
|
[Name, Event, StateName]);
|
|
_ ->
|
|
io:format(Dev, "*DBG* ~p got ~p in state ~w~n",
|
|
[Name, Msg, StateName])
|
|
end;
|
|
print_event(Dev, {out, Msg, To, StateName}, Name) ->
|
|
io:format(Dev, "*DBG* ~p sent ~p to ~w~n"
|
|
" and switched to state ~w~n",
|
|
[Name, Msg, To, StateName]);
|
|
print_event(Dev, return, {Name, StateName}) ->
|
|
io:format(Dev, "*DBG* ~p switched to state ~w~n",
|
|
[Name, StateName]).
|
|
|
|
handle_msg(Msg, Parent, Name, StateName, StateData, Mod, _Time, Limits) -> %No debug here
|
|
From = from(Msg),
|
|
case catch dispatch(Msg, Mod, StateName, StateData) of
|
|
{next_state, NStateName, NStateData} ->
|
|
loop(Parent, Name, NStateName, NStateData,
|
|
Mod, infinity, [], Limits);
|
|
{next_state, NStateName, NStateData, Time1} ->
|
|
loop(Parent, Name, NStateName, NStateData, Mod, Time1, [], Limits);
|
|
{reply, Reply, NStateName, NStateData} when From /= undefined ->
|
|
reply(From, Reply),
|
|
loop(Parent, Name, NStateName, NStateData,
|
|
Mod, infinity, [], Limits);
|
|
{reply, Reply, NStateName, NStateData, Time1} when From /= undefined ->
|
|
reply(From, Reply),
|
|
loop(Parent, Name, NStateName, NStateData, Mod, Time1, [], Limits);
|
|
{stop, Reason, NStateData} ->
|
|
terminate(Reason, Name, Msg, Mod, StateName, NStateData, []);
|
|
{stop, Reason, Reply, NStateData} when From /= undefined ->
|
|
{'EXIT', R} = (catch terminate(Reason, Name, Msg, Mod,
|
|
StateName, NStateData, [])),
|
|
reply(From, Reply),
|
|
exit(R);
|
|
{'EXIT', What} ->
|
|
terminate(What, Name, Msg, Mod, StateName, StateData, []);
|
|
Reply ->
|
|
terminate({bad_return_value, Reply},
|
|
Name, Msg, Mod, StateName, StateData, [])
|
|
end.
|
|
|
|
handle_msg(Msg, Parent, Name, StateName, StateData,
|
|
Mod, _Time, Debug, Limits) ->
|
|
From = from(Msg),
|
|
case catch dispatch(Msg, Mod, StateName, StateData) of
|
|
{next_state, NStateName, NStateData} ->
|
|
Debug1 = sys:handle_debug(Debug, {?MODULE, print_event},
|
|
{Name, NStateName}, return),
|
|
loop(Parent, Name, NStateName, NStateData,
|
|
Mod, infinity, Debug1, Limits);
|
|
{next_state, NStateName, NStateData, Time1} ->
|
|
Debug1 = sys:handle_debug(Debug, {?MODULE, print_event},
|
|
{Name, NStateName}, return),
|
|
loop(Parent, Name, NStateName, NStateData,
|
|
Mod, Time1, Debug1, Limits);
|
|
{reply, Reply, NStateName, NStateData} when From /= undefined ->
|
|
Debug1 = reply(Name, From, Reply, Debug, NStateName),
|
|
loop(Parent, Name, NStateName, NStateData,
|
|
Mod, infinity, Debug1, Limits);
|
|
{reply, Reply, NStateName, NStateData, Time1} when From /= undefined ->
|
|
Debug1 = reply(Name, From, Reply, Debug, NStateName),
|
|
loop(Parent, Name, NStateName, NStateData,
|
|
Mod, Time1, Debug1, Limits);
|
|
{stop, Reason, NStateData} ->
|
|
terminate(Reason, Name, Msg, Mod, StateName, NStateData, Debug);
|
|
{stop, Reason, Reply, NStateData} when From /= undefined ->
|
|
{'EXIT', R} = (catch terminate(Reason, Name, Msg, Mod,
|
|
StateName, NStateData, Debug)),
|
|
reply(Name, From, Reply, Debug, StateName),
|
|
exit(R);
|
|
{'EXIT', What} ->
|
|
terminate(What, Name, Msg, Mod, StateName, StateData, Debug);
|
|
Reply ->
|
|
terminate({bad_return_value, Reply},
|
|
Name, Msg, Mod, StateName, StateData, Debug)
|
|
end.
|
|
|
|
dispatch({'$gen_event', Event}, Mod, StateName, StateData) ->
|
|
Mod:StateName(Event, StateData);
|
|
dispatch({'$gen_all_state_event', Event}, Mod, StateName, StateData) ->
|
|
Mod:handle_event(Event, StateName, StateData);
|
|
dispatch({'$gen_sync_event', From, Event}, Mod, StateName, StateData) ->
|
|
Mod:StateName(Event, From, StateData);
|
|
dispatch({'$gen_sync_all_state_event', From, Event},
|
|
Mod, StateName, StateData) ->
|
|
Mod:handle_sync_event(Event, From, StateName, StateData);
|
|
dispatch({timeout, Ref, {'$gen_timer', Msg}}, Mod, StateName, StateData) ->
|
|
Mod:StateName({timeout, Ref, Msg}, StateData);
|
|
dispatch({timeout, _Ref, {'$gen_event', Event}}, Mod, StateName, StateData) ->
|
|
Mod:StateName(Event, StateData);
|
|
dispatch(Info, Mod, StateName, StateData) ->
|
|
Mod:handle_info(Info, StateName, StateData).
|
|
|
|
from({'$gen_sync_event', From, _Event}) -> From;
|
|
from({'$gen_sync_all_state_event', From, _Event}) -> From;
|
|
from(_) -> undefined.
|
|
|
|
%% Send a reply to the client.
|
|
reply({To, Tag}, Reply) ->
|
|
catch To ! {Tag, Reply}.
|
|
|
|
reply(Name, {To, Tag}, Reply, Debug, StateName) ->
|
|
reply({To, Tag}, Reply),
|
|
sys:handle_debug(Debug, {?MODULE, print_event}, Name,
|
|
{out, Reply, To, StateName}).
|
|
|
|
%%% ---------------------------------------------------
|
|
%%% Terminate the server.
|
|
%%% ---------------------------------------------------
|
|
|
|
terminate(Reason, Name, Msg, Mod, StateName, StateData, Debug) ->
|
|
case catch Mod:terminate(Reason, StateName, StateData) of
|
|
{'EXIT', R} ->
|
|
error_info(R, Name, Msg, StateName, StateData, Debug),
|
|
exit(R);
|
|
_ ->
|
|
case Reason of
|
|
normal ->
|
|
exit(normal);
|
|
shutdown ->
|
|
exit(shutdown);
|
|
priority_shutdown ->
|
|
%% Priority shutdown should be considered as
|
|
%% shutdown by SASL
|
|
exit(shutdown);
|
|
{process_limit, Limit} ->
|
|
%% Priority shutdown should be considered as
|
|
%% shutdown by SASL
|
|
error_logger:error_msg("FSM limit reached (~p): ~p~n",
|
|
[self(), Limit]),
|
|
exit(shutdown);
|
|
_ ->
|
|
error_info(Reason, Name, Msg, StateName, StateData, Debug),
|
|
exit(Reason)
|
|
end
|
|
end.
|
|
|
|
error_info(Reason, Name, Msg, StateName, StateData, Debug) ->
|
|
Reason1 =
|
|
case Reason of
|
|
{undef,[{M,F,A}|MFAs]} ->
|
|
case code:is_loaded(M) of
|
|
false ->
|
|
{'module could not be loaded',[{M,F,A}|MFAs]};
|
|
_ ->
|
|
case erlang:function_exported(M, F, length(A)) of
|
|
true ->
|
|
Reason;
|
|
false ->
|
|
{'function not exported',[{M,F,A}|MFAs]}
|
|
end
|
|
end;
|
|
_ ->
|
|
Reason
|
|
end,
|
|
Str = "** State machine ~p terminating \n" ++
|
|
get_msg_str(Msg) ++
|
|
"** When State == ~p~n"
|
|
"** Data == ~p~n"
|
|
"** Reason for termination = ~n** ~p~n",
|
|
format(Str, [Name, get_msg(Msg), StateName, StateData, Reason1]),
|
|
sys:print_log(Debug),
|
|
ok.
|
|
|
|
get_msg_str({'$gen_event', _Event}) ->
|
|
"** Last event in was ~p~n";
|
|
get_msg_str({'$gen_sync_event', _Event}) ->
|
|
"** Last sync event in was ~p~n";
|
|
get_msg_str({'$gen_all_state_event', _Event}) ->
|
|
"** Last event in was ~p (for all states)~n";
|
|
get_msg_str({'$gen_sync_all_state_event', _Event}) ->
|
|
"** Last sync event in was ~p (for all states)~n";
|
|
get_msg_str({timeout, _Ref, {'$gen_timer', _Msg}}) ->
|
|
"** Last timer event in was ~p~n";
|
|
get_msg_str({timeout, _Ref, {'$gen_event', _Msg}}) ->
|
|
"** Last timer event in was ~p~n";
|
|
get_msg_str(_Msg) ->
|
|
"** Last message in was ~p~n".
|
|
|
|
get_msg({'$gen_event', Event}) -> Event;
|
|
get_msg({'$gen_sync_event', Event}) -> Event;
|
|
get_msg({'$gen_all_state_event', Event}) -> Event;
|
|
get_msg({'$gen_sync_all_state_event', Event}) -> Event;
|
|
get_msg({timeout, Ref, {'$gen_timer', Msg}}) -> {timeout, Ref, Msg};
|
|
get_msg({timeout, _Ref, {'$gen_event', Event}}) -> Event;
|
|
get_msg(Msg) -> Msg.
|
|
|
|
%%-----------------------------------------------------------------
|
|
%% Status information
|
|
%%-----------------------------------------------------------------
|
|
format_status(Opt, StatusData) ->
|
|
[PDict, SysState, Parent, Debug, [Name, StateName, StateData, Mod, _Time]] =
|
|
StatusData,
|
|
Header = lists:concat(["Status for state machine ", Name]),
|
|
Log = sys:get_debug(log, Debug, []),
|
|
Specfic =
|
|
case erlang:function_exported(Mod, format_status, 2) of
|
|
true ->
|
|
case catch Mod:format_status(Opt,[PDict,StateData]) of
|
|
{'EXIT', _} -> [{data, [{"StateData", StateData}]}];
|
|
Else -> Else
|
|
end;
|
|
_ ->
|
|
[{data, [{"StateData", StateData}]}]
|
|
end,
|
|
[{header, Header},
|
|
{data, [{"Status", SysState},
|
|
{"Parent", Parent},
|
|
{"Logged events", Log},
|
|
{"StateName", StateName}]} |
|
|
Specfic].
|
|
|
|
%%-----------------------------------------------------------------
|
|
%% Resources limit management
|
|
%%-----------------------------------------------------------------
|
|
%% Extract know limit options
|
|
limit_options(Options) ->
|
|
limit_options(Options, #limits{}).
|
|
limit_options([], Limits) ->
|
|
Limits;
|
|
%% Maximum number of messages allowed in the process message queue
|
|
limit_options([{max_queue,N}|Options], Limits)
|
|
when integer(N) ->
|
|
NewLimits = Limits#limits{max_queue=N},
|
|
limit_options(Options, NewLimits);
|
|
limit_options([_|Options], Limits) ->
|
|
limit_options(Options, Limits).
|
|
|
|
%% Throw max_queue if we have reach the max queue size
|
|
%% Returns ok otherwise
|
|
message_queue_len(#limits{max_queue = undefined}) ->
|
|
ok;
|
|
message_queue_len(#limits{max_queue = MaxQueue}) ->
|
|
Pid = self(),
|
|
case process_info(Pid, message_queue_len) of
|
|
{message_queue_len, N} when N > MaxQueue ->
|
|
throw({process_limit, {max_queue, N}});
|
|
_ ->
|
|
ok
|
|
end.
|