%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1996-2009. All Rights Reserved.
%%
%% 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 online 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.
%%
%% %CopyrightEnd%
%%
-module(os_mon).
-behaviour(application).
-behaviour(supervisor).
%% API
-export([call/2, call/3, get_env/2]).
%% Application callbacks
-export([start/2, stop/1]).
%% Supervisor callbacks
-export([init/1]).
%%%-----------------------------------------------------------------
%%% API
%%%-----------------------------------------------------------------
call(Service, Request) ->
call(Service, Request, 5000).
call(Service, Request, Timeout) ->
try gen_server:call(server_name(Service), Request, Timeout)
catch
exit:{noproc, Call} ->
case lists:keysearch(os_mon, 1,
application:which_applications()) of
{value, _AppInfo} ->
case startp(Service) of
true ->
erlang:exit({noproc, Call});
false ->
String = "OS_MON (~p) called by ~p, "
"unavailable~n",
error_logger:warning_msg(String,
[Service, self()]),
Service:dummy_reply(Request)
end;
false ->
String = "OS_MON (~p) called by ~p, not started~n",
error_logger:warning_msg(String, [Service, self()]),
Service:dummy_reply(Request)
end
end.
get_env(Service, Param) ->
case application:get_env(os_mon, Param) of
{ok, Value} ->
case Service:param_type(Param, Value) of
true ->
Value;
false ->
String = "OS_MON (~p), ignoring "
"bad configuration parameter (~p=~p)~n"
"Using default value instead~n",
error_logger:warning_msg(String,
[Service, Param, Value]),
Service:param_default(Param)
end;
undefined ->
Service:param_default(Param)
end.
%%%-----------------------------------------------------------------
%%% Application callbacks
%%%-----------------------------------------------------------------
start(_, _) ->
supervisor:start_link({local, os_mon_sup}, os_mon, []).
stop(_) ->
ok.
%%%-----------------------------------------------------------------
%%% Supervisor callbacks
%%%-----------------------------------------------------------------
init([]) ->
SupFlags = case os:type() of
{win32, _} ->
{one_for_one, 5, 3600};
_ ->
{one_for_one, 4, 3600}
end,
SysInf = childspec(sysinfo, startp(sysinfo)),
DskSup = childspec(disksup, startp(disksup)),
MemSup = childspec(memsup, startp(memsup)),
CpuSup = childspec(cpu_sup, startp(cpu_sup)),
OsSup = childspec(os_sup, startp(os_sup)),
{ok, {SupFlags, SysInf ++ DskSup ++ MemSup ++ CpuSup ++ OsSup}}.
childspec(_Service, false) ->
[];
childspec(cpu_sup, true) ->
[{cpu_sup, {cpu_sup, start_link, []},
permanent, 2000, worker, [cpu_sup]}];
childspec(disksup, true) ->
[{disksup, {disksup, start_link, []},
permanent, 2000, worker, [disksup]}];
childspec(memsup, true) ->
[{memsup, {memsup, start_link, []},
permanent, 2000, worker, [memsup]}];
childspec(os_sup, true) ->
OS = os:type(),
Mod = case OS of
{win32, _} -> nteventlog; % windows
_ -> os_sup % solaris
end,
[{os_sup, {os_sup, start_link, [OS]},
permanent, 10000, worker, [Mod]}];
childspec(sysinfo, true) ->
[{os_mon_sysinfo, {os_mon_sysinfo, start_link, []},
permanent, 2000, worker, [os_mon_sysinfo]}].
%%%-----------------------------------------------------------------
%%% Internal functions (OS_Mon configuration)
%%%-----------------------------------------------------------------
startp(Service) ->
%% Available for this platform?
case lists:member(Service, services(os:type())) of
true ->
%% Is there a start configuration parameter?
case start_param(Service) of
none ->
true;
Param ->
%% Is the start configuration parameter 'true'?
case application:get_env(os_mon, Param) of
{ok, true} ->
true;
_ ->
false
end
end;
false ->
false
end.
services({unix, sunos}) ->
[cpu_sup, disksup, memsup, os_sup];
services({unix, _}) -> % Other unix.
[cpu_sup, disksup, memsup];
services({win32, _}) ->
[disksup, memsup, os_sup, sysinfo];
services(vxworks) ->
[memsup];
services(_) ->
[].
server_name(cpu_sup) -> cpu_sup;
server_name(disksup) -> disksup;
server_name(memsup) -> memsup;
server_name(os_sup) -> os_sup_server;
server_name(sysinfo) -> os_mon_sysinfo.
start_param(cpu_sup) -> start_cpu_sup;
start_param(disksup) -> start_disksup;
start_param(memsup) -> start_memsup;
start_param(os_sup) -> start_os_sup;
start_param(sysinfo) -> none.
