prosody
6c2c2fc4b8dd
util/timer.lua

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util/timer.lua @ 8502:6c2c2fc4b8dd

util.pubsub: Support a 'nodestore' for persisting nodes (same API as kv stores)
author Matthew Wild <mwild1@gmail.com>
date Fri, 02 Feb 2018 19:31:03 +0000
parent 7989:5632aa85e0b6
child 8555:4f0f5b49bb03
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rev   line source
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 --
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9 local indexedbheap = require "util.indexedbheap";
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10 local log = require "util.logger".init("timer");
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11 local server = require "net.server";
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12 local get_time = require "util.time".now
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13 local type = type;
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14 local debug_traceback = debug.traceback;
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15 local tostring = tostring;
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16 local xpcall = xpcall;
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17
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18 local _ENV = nil;
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20 local _add_task = server.add_task;
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22 local _server_timer;
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23 local _active_timers = 0;
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24 local h = indexedbheap.create();
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25 local params = {};
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26 local next_time = nil;
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27 local _id, _callback, _now, _param;
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28 local function _call() return _callback(_now, _id, _param); end
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29 local function _traceback_handler(err) log("error", "Traceback[timer]: %s", debug_traceback(tostring(err), 2)); end
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30 local function _on_timer(now)
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31 local peek;
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32 while true do
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33 peek = h:peek();
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34 if peek == nil or peek > now then break; end
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35 local _;
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36 _, _callback, _id = h:pop();
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37 _now = now;
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38 _param = params[_id];
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39 params[_id] = nil;
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40 --item(now, id, _param); -- FIXME pcall
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41 local success, err = xpcall(_call, _traceback_handler);
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42 if success and type(err) == "number" then
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43 h:insert(_callback, err + now, _id); -- re-add
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44 params[_id] = _param;
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45 end
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46 end
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47
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48 if peek ~= nil and _active_timers > 1 and peek == next_time then
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49 -- Another instance of _on_timer already set next_time to the same value,
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50 -- so it should be safe to not renew this timer event
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51 peek = nil;
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52 else
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53 next_time = peek;
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54 end
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55
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56 if peek then
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57 -- peek is the time of the next event
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58 return peek - now;
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59 end
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60 _active_timers = _active_timers - 1;
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61 end
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62 local function add_task(delay, callback, param)
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63 local current_time = get_time();
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64 local event_time = current_time + delay;
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65
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66 local id = h:insert(callback, event_time);
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67 params[id] = param;
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68 if next_time == nil or event_time < next_time then
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69 next_time = event_time;
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70 if _server_timer then
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71 _server_timer:close();
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72 _server_timer = nil;
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73 else
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74 _active_timers = _active_timers + 1;
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75 end
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76 _server_timer = _add_task(next_time - current_time, _on_timer);
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77 end
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78 return id;
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79 end
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80 local function stop(id)
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81 params[id] = nil;
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82 local result, item, result_sync = h:remove(id);
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83 local peek = h:peek();
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84 if peek ~= next_time and _server_timer then
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85 next_time = peek;
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86 _server_timer:close();
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87 if next_time ~= nil then
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88 _server_timer = _add_task(next_time - get_time(), _on_timer);
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89 end
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90 end
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91 return result, item, result_sync;
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92 end
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93 local function reschedule(id, delay)
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94 local current_time = get_time();
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95 local event_time = current_time + delay;
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96 h:reprioritize(id, delay);
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97 if next_time == nil or event_time < next_time then
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98 next_time = event_time;
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99 _add_task(next_time - current_time, _on_timer);
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100 end
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101 return id;
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102 end
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103
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104 return {
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105 add_task = add_task;
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106 stop = stop;
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107 reschedule = reschedule;
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108 };
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109