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-rw-r--r--lib/runtime_tools/src/ttb_autostart.erl55
1 files changed, 55 insertions, 0 deletions
diff --git a/lib/runtime_tools/src/ttb_autostart.erl b/lib/runtime_tools/src/ttb_autostart.erl
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+++ b/lib/runtime_tools/src/ttb_autostart.erl
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+%%%-------------------------------------------------------------------
+%%% File : ttb_autostart.erl
+%%% Author : Bartłomiej Puzoń <[email protected]>
+%%% Description : This supervisor is used to resume ttb tracing
+%%% Users are able to provide custom restart modules for *_config, as
+%%% file:write/read/delete may not be possible on diskless nodes.
+%%%
+%%% Created : 31 Jul 2010 by <[email protected]>
+%%%-------------------------------------------------------------------
+-module(ttb_autostart).
+
+-behaviour(gen_server).
+
+%% API
+-export([start_link/0,
+ read_config/0,
+ write_config/1,
+ delete_config/0]).
+
+%% gen_server callbacks
+-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
+ terminate/2, code_change/3]).
+
+-define(DEF_AUTOSTART_MODULE, ?MODULE).
+-define(AUTOSTART_FILENAME, "ttb_autostart.bin").
+
+start_link() ->
+ gen_server:start_link(?MODULE, no_args, []).
+
+delete_config() ->
+ file:delete(?AUTOSTART_FILENAME).
+
+read_config() ->
+ case file:read_file(?AUTOSTART_FILENAME) of
+ {ok, Data} -> {ok, binary_to_term(Data)};
+ Error -> Error
+ end.
+
+write_config(Data) ->
+ file:write_file(?AUTOSTART_FILENAME, term_to_binary(Data)).
+
+init(no_args) ->
+ case application:get_env(runtime_tools, ttb_autostart_module) of
+ {ok, _} -> ok;
+ undefined -> application:set_env(runtime_tools, ttb_autostart_module, ?DEF_AUTOSTART_MODULE)
+ end,
+ observer_backend:ttb_resume_trace(),
+ %%As the process is not needed any more, it will shut itself down
+ {ok, no_args, 10000}.
+
+handle_call(_,_,_) -> {noreply, no_args}.
+handle_cast(_,_) -> {noreply, no_args}.
+handle_info(timeout,_) -> {stop, normal, no_args}.
+terminate(_,_) -> ok.
+code_change(_,_,_) -> {ok, no_args}.