prosody
3603aeb325de
util/events.lua

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util/events.lua @ 3641:3603aeb325de

mod_pubsub, util.pubsub: Support for fetching items
author Florian Zeitz <florob@babelmonkeys.de>
date Thu, 25 Nov 2010 21:47:12 +0100
parent 3501:90c18e0355af
child 3776:bc4f67a0658d
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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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15
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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 end
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49 end;
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50 local function add_handlers(handlers)
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51 for event, handler in pairs(handlers) do
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52 add_handler(event, handler);
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53 end
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54 end;
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55 local function remove_handlers(handlers)
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56 for event, handler in pairs(handlers) do
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57 remove_handler(event, handler);
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58 end
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59 end;
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60 local function fire_event(event, ...)
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61 local h = handlers[event];
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62 if h then
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63 for i=1,#h do
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64 local ret = h[i](...);
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65 if ret ~= nil then return ret; end
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66 end
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67 end
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68 end;
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69 return {
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70 add_handler = add_handler;
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71 remove_handler = remove_handler;
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72 add_handlers = add_handlers;
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73 remove_handlers = remove_handlers;
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74 fire_event = fire_event;
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75 _handlers = handlers;
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76 _event_map = event_map;
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77 };
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78 end
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79
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80 return _M;