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[prosody.git] / util / timer.lua
1 -- Prosody IM
2 -- Copyright (C) 2008-2010 Matthew Wild
3 -- Copyright (C) 2008-2010 Waqas Hussain
4 -- 
5 -- This project is MIT/X11 licensed. Please see the
6 -- COPYING file in the source package for more information.
7 --
8
9
10 local ns_addtimer = require "net.server".addtimer;
11 local event = require "net.server".event;
12 local event_base = require "net.server".event_base;
13
14 local math_min = math.min
15 local math_huge = math.huge
16 local get_time = require "socket".gettime;
17 local t_insert = table.insert;
18 local t_remove = table.remove;
19 local ipairs, pairs = ipairs, pairs;
20 local type = type;
21
22 local data = {};
23 local new_data = {};
24
25 module "timer"
26
27 local _add_task;
28 if not event then
29         function _add_task(delay, func)
30                 local current_time = get_time();
31                 delay = delay + current_time;
32                 if delay >= current_time then
33                         t_insert(new_data, {delay, func});
34                 else
35                         func();
36                 end
37         end
38
39         ns_addtimer(function()
40                 local current_time = get_time();
41                 if #new_data > 0 then
42                         for _, d in pairs(new_data) do
43                                 t_insert(data, d);
44                         end
45                         new_data = {};
46                 end
47                 
48                 local next_time = math_huge;
49                 for i, d in pairs(data) do
50                         local t, func = d[1], d[2];
51                         if t <= current_time then
52                                 data[i] = nil;
53                                 local r = func(current_time);
54                                 if type(r) == "number" then
55                                         _add_task(r, func);
56                                         next_time = math_min(next_time, r);
57                                 end
58                         else
59                                 next_time = math_min(next_time, t - current_time);
60                         end
61                 end
62                 return next_time;
63         end);
64 else
65         local EVENT_LEAVE = (event.core and event.core.LEAVE) or -1;
66         function _add_task(delay, func)
67                 local event_handle;
68                 event_handle = event_base:addevent(nil, 0, function ()
69                         local ret = func();
70                         if ret then
71                                 return 0, ret;
72                         elseif event_handle then
73                                 return EVENT_LEAVE;
74                         end
75                 end
76                 , delay);
77         end
78 end
79
80 add_task = _add_task;
81
82 return _M;