prosody
e6fed1d80116
util/events.lua

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util/events.lua @ 5915:e6fed1d80116

Back out 1b0ac7950129, as SSLv3 appears to still be in moderate use on the network. Also, although obsolete, SSLv3 isn't documented to have any weaknesses that TLS 1.0 (the most common version used today) doesn't also have. Get your act together clients!
author Matthew Wild <mwild1@gmail.com>
date Tue, 12 Nov 2013 02:13:01 +0000
parent 3776:bc4f67a0658d
child 5749:60b3b6d27364
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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
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10 local pairs = pairs;
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11 local t_insert = table.insert;
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12 local t_sort = table.sort;
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13 local setmetatable = setmetatable;
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14 local next = next;
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16 module "events"
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17
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18 function new()
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19 local handlers = {};
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20 local event_map = {};
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21 local function _rebuild_index(handlers, event)
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22 local _handlers = event_map[event];
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23 if not _handlers or next(_handlers) == nil then return; end
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24 local index = {};
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25 for handler in pairs(_handlers) do
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26 t_insert(index, handler);
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27 end
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28 t_sort(index, function(a, b) return _handlers[a] > _handlers[b]; end);
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29 handlers[event] = index;
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30 return index;
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31 end;
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32 setmetatable(handlers, { __index = _rebuild_index });
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33 local function add_handler(event, handler, priority)
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34 local map = event_map[event];
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35 if map then
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36 map[handler] = priority or 0;
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37 else
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38 map = {[handler] = priority or 0};
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39 event_map[event] = map;
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40 end
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41 handlers[event] = nil;
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42 end;
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43 local function remove_handler(event, handler)
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44 local map = event_map[event];
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45 if map then
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46 map[handler] = nil;
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47 handlers[event] = nil;
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48 if next(map) == nil then
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49 event_map[event] = nil;
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50 end
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51 end
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52 end;
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53 local function add_handlers(handlers)
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54 for event, handler in pairs(handlers) do
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55 add_handler(event, handler);
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56 end
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57 end;
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58 local function remove_handlers(handlers)
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59 for event, handler in pairs(handlers) do
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60 remove_handler(event, handler);
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61 end
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62 end;
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63 local function fire_event(event, ...)
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64 local h = handlers[event];
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65 if h then
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66 for i=1,#h do
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67 local ret = h[i](...);
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68 if ret ~= nil then return ret; end
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69 end
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70 end
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71 end;
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72 return {
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73 add_handler = add_handler;
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74 remove_handler = remove_handler;
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75 add_handlers = add_handlers;
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76 remove_handlers = remove_handlers;
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77 fire_event = fire_event;
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78 _handlers = handlers;
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79 _event_map = event_map;
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80 };
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81 end
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82
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83 return _M;