From c12a0b236e08a486c0ebee2d508d28f18fd4ba73 Mon Sep 17 00:00:00 2001
From: hejin <hejin1026@gmail.com>
Date: Mon, 1 Dec 2014 22:54:48 +0800
Subject: [PATCH] add monitor

---
 src/emqtt_monitor.erl | 96 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 src/emqtt_monitor.erl

diff --git a/src/emqtt_monitor.erl b/src/emqtt_monitor.erl
new file mode 100644
index 000000000..1fcff7353
--- /dev/null
+++ b/src/emqtt_monitor.erl
@@ -0,0 +1,96 @@
+-module(emqtt_monitor).
+
+-include_lib("elog/include/elog.hrl").
+
+-behavior(gen_server).
+
+-export([start_link/0]).
+
+-export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2, code_change/3]).
+
+-record(state, {ok}).
+
+%%--------------------------------------------------------------------
+%% Function: start_link() -> {ok,Pid} | ignore | {error,Error}
+%% Description: Starts the server
+%%--------------------------------------------------------------------
+start_link() ->
+    gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
+
+%%--------------------------------------------------------------------
+%% Function: init(Args) -> {ok, State} |
+%%                         {ok, State, Timeout} |
+%%                         ignore               |
+%%                         {stop, Reason}
+%% Description: Initiates the server
+%%--------------------------------------------------------------------
+init([]) ->
+    erlang:system_monitor(self(), [{long_gc, 5000}, {large_heap, 10000}, busy_port]),
+    ?INFO("monitor is started...[ok]", []),
+    {ok, #state{}}.
+%%--------------------------------------------------------------------
+%% 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(Request, _From, State) ->
+    ?ERROR("unexpected request: ~p", [Request]),
+    {reply, {error, unexpected_request}, State}.
+%%--------------------------------------------------------------------
+%% Function: handle_cast(Msg, State) -> {noreply, State} |
+%%                                      {noreply, State, Timeout} |
+%%                                      {stop, Reason, State}
+%% Description: Handling cast messages
+%%--------------------------------------------------------------------
+handle_cast(Msg, State) ->
+    ?ERROR("unexpected msg: ~p", [Msg]),
+    {noreply, State}.
+%%--------------------------------------------------------------------
+%% Function: handle_info(Info, State) -> {noreply, State} |
+%%                                       {noreply, State, Timeout} |
+%%                                       {stop, Reason, State}
+%% Description: Handling all non call/cast messages
+%%--------------------------------------------------------------------
+handle_info({monitor, GcPid, long_gc, Info}, State) ->
+    ?ERROR("long_gc: gcpid = ~p, ~p ~n ~p", [GcPid, process_info(GcPid, 
+		[registered_name, memory, message_queue_len,heap_size,total_heap_size]), Info]),
+    {noreply, State};
+
+handle_info({monitor, GcPid, large_heap, Info}, State) ->
+	[{messages,Mess}] = process_info(GcPid, [messages]),
+    ?ERROR("large_heap: gcpid = ~p,~p ~n ~p, ~p", [GcPid, process_info(GcPid, 
+		[registered_name, memory, message_queue_len,heap_size,total_heap_size]), 
+			lists:nth(1, Mess),Info]),
+    {noreply, State};
+
+handle_info({monitor, SusPid, busy_port, Port}, State) ->
+    ?ERROR("busy_port: suspid = ~p, port = ~p", [process_info(SusPid, 
+		[registered_name, memory, message_queue_len,heap_size,total_heap_size]), Port]),
+    {noreply, State};
+
+handle_info(Info, State) ->
+    ?ERROR("unexpected info: ~p", [Info]),
+    {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}.
+
+