prosody
58e260832334
util/timer.lua

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util/timer.lua @ 6930:58e260832334

util.timer: Keep count of how many timer instances are active
author Kim Alvefur <zash@zash.se>
date Sun, 22 Nov 2015 17:18:29 +0100
parent 6836:9f45f0fe5aef
child 6931:5c2c8aeb4690
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rev   line source
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Matthew Wild <mwild1@gmail.com>
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1 -- Prosody IM
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b7049746bd29 Update copyright headers for 2010
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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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07d0a3a75c8a net.server, net.timer, net.server_select: Rearrange dependencies between these three modules. server.addtimer() is no longer a public function (renamed to _addtimer) and is not available at all from server_event (compat code removed to prevent traceback) (thanks Nulani)
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11 local server = require "net.server";
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12 local get_time = require "socket".gettime;
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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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18 local _ENV = nil;
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20 local _add_task = server.add_task;
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22 local _active_timers = 0;
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23 local h = indexedbheap.create();
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24 local params = {};
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25 local next_time = nil;
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26 local _id, _callback, _now, _param;
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27 local function _call() return _callback(_now, _id, _param); end
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28 local function _traceback_handler(err) log("error", "Traceback[timer]: %s", debug_traceback(tostring(err), 2)); end
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29 local function _on_timer(now)
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30 local peek;
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31 while true do
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32 peek = h:peek();
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33 if peek == nil or peek > now then break; end
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34 local _;
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35 _, _callback, _id = h:pop();
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36 _now = now;
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37 _param = params[_id];
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38 params[_id] = nil;
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39 --item(now, id, _param); -- FIXME pcall
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40 local success, err = xpcall(_call, _traceback_handler);
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41 if success and type(err) == "number" then
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42 h:insert(_callback, err + now, _id); -- re-add
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43 params[_id] = _param;
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44 end
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45 end
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46 next_time = peek;
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47 if peek ~= nil then
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48 return peek - now;
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49 end
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50 _active_timers = _active_timers - 1;
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51 end
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52 local function add_task(delay, callback, param)
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53 local current_time = get_time();
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54 local event_time = current_time + delay;
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55
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56 local id = h:insert(callback, event_time);
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57 params[id] = param;
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58 if next_time == nil or event_time < next_time then
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59 next_time = event_time;
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60 _active_timers = _active_timers + 1;
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61 _add_task(next_time - current_time, _on_timer);
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62 end
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63 return id;
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64 end
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65 local function stop(id)
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66 params[id] = nil;
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67 return h:remove(id);
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68 end
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69 local function reschedule(id, delay)
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70 local current_time = get_time();
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71 local event_time = current_time + delay;
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72 h:reprioritize(id, delay);
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73 if next_time == nil or event_time < next_time then
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74 next_time = event_time;
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75 _add_task(next_time - current_time, _on_timer);
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76 end
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77 return id;
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78 end
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79
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80 return {
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81 add_task = add_task;
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82 stop = stop;
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83 reschedule = reschedule;
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84 };
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85