prosody
1f4a4e6ae694
util/events.lua

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util/events.lua @ 1197:1f4a4e6ae694

Merge with 0.4
author Matthew Wild <mwild1@gmail.com>
date Fri, 22 May 2009 15:19:12 +0100
parent 1181:dffbb7d1da4b
child 1417:b02b22f77326
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1
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2 local ipairs = ipairs;
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3 local pairs = pairs;
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4 local t_insert = table.insert;
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5 local t_sort = table.sort;
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6 local select = select;
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8 module "events"
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10 function new()
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11 local dispatchers = {};
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12 local handlers = {};
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13 local event_map = {};
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14 local function _rebuild_index(event) -- TODO optimize index rebuilding
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15 local _handlers = event_map[event];
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16 local index = handlers[event];
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17 if index then
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18 for i=#index,1,-1 do index[i] = nil; end
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19 else index = {}; handlers[event] = index; end
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20 for handler in pairs(_handlers) do
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21 t_insert(index, handler);
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22 end
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23 t_sort(index, function(a, b) return _handlers[a] > _handlers[b]; end);
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24 end;
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25 local function add_handler(event, handler, priority)
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26 local map = event_map[event];
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27 if map then
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28 map[handler] = priority or 0;
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29 else
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30 map = {[handler] = priority or 0};
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31 event_map[event] = map;
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32 end
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33 _rebuild_index(event);
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34 end;
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35 local function remove_handler(event, handler)
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36 local map = event_map[event];
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37 if map then
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38 map[handler] = nil;
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39 _rebuild_index(event);
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40 end
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41 end;
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42 local function add_plugin(plugin)
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43 for event, handler in pairs(plugin) do
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44 add_handler(event, handler);
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45 end
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46 end;
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47 local function remove_plugin(plugin)
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48 for event, handler in pairs(plugin) do
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49 remove_handler(event, handler);
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50 end
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51 end;
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52 local function _create_dispatcher(event) -- FIXME duplicate code in fire_event
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53 local h = handlers[event];
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54 if not h then h = {}; handlers[event] = h; end
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55 local dispatcher = function(...)
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56 for _, handler in ipairs(h) do
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57 local ret = handler(...);
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58 if ret ~= nil then return ret; end
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59 end
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60 end;
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61 dispatchers[event] = dispatcher;
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62 return dispatcher;
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63 end;
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64 local function get_dispatcher(event)
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65 return dispatchers[event] or _create_dispatcher(event);
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66 end;
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67 local function fire_event(event, ...) -- FIXME duplicates dispatcher code
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68 local h = handlers[event];
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69 if h then
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70 for _, handler in ipairs(h) do
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71 local ret = handler(...);
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72 if ret ~= nil then return ret; end
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73 end
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74 end
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75 end;
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76 local function get_named_arg_dispatcher(event, ...)
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77 local dispatcher = get_dispatcher(event);
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78 local keys = {...};
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79 local data = {};
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80 return function(...)
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81 for i, key in ipairs(keys) do data[key] = select(i, ...); end
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82 dispatcher(data);
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83 end;
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84 end;
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85 return {
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86 add_handler = add_handler;
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87 remove_handler = remove_handler;
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88 add_plugin = add_plugin;
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89 remove_plugin = remove_plugin;
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90 get_dispatcher = get_dispatcher;
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91 fire_event = fire_event;
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92 get_named_arg_dispatcher = get_named_arg_dispatcher;
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93 _dispatchers = dispatchers;
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94 _handlers = handlers;
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95 _event_map = event_map;
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96 };
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97 end
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98
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99 return _M;