Annotate

util/timer.lua @ 8314:1d2149d84c72

net.server_event: Add "libevent" to backend description
author Kim Alvefur <zash@zash.se>
date Mon, 09 Oct 2017 02:22:33 +0200
parent 7989:5632aa85e0b6
child 8555:4f0f5b49bb03
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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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parents: 5776
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95 local event_time = current_time + delay;
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parents: 5776
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96 h:reprioritize(id, delay);
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Waqas Hussain <waqas20@gmail.com>
parents: 5776
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97 if next_time == nil or event_time < next_time then
615a0774e4cc util.timer: Updated to use util.indexedbheap to provide a more complete API. Timers can now be stopped or rescheduled. Callbacks are now pcall'd. Adding/removing timers from within timer callbacks works better. Optional parameter can be passed when creating timer which gets passed to callback, eliminating the need for closures in various timer uses. Timers are now much more lightweight.
Waqas Hussain <waqas20@gmail.com>
parents: 5776
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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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Waqas Hussain <waqas20@gmail.com>
parents: 5776
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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