prosody
9d2b56fd6b47
util/events.lua

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util/events.lua @ 6638:9d2b56fd6b47

util.events: Add support for event wrappers, functions which can wrap the calling of event handlers to run code before/after an event (for debugging, statistics, logging purposes, etc.)
author Matthew Wild <mwild1@gmail.com>
date Tue, 28 Apr 2015 13:42:59 +0100
parent 5776:bd0ff8ae98a8
child 6641:b44ebfe81c73
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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 global_wrappers;
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21 local wrappers = {};
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22 local event_map = {};
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23 local function _rebuild_index(handlers, event)
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24 local _handlers = event_map[event];
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25 if not _handlers or next(_handlers) == nil then return; end
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26 local index = {};
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27 for handler in pairs(_handlers) do
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28 t_insert(index, handler);
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29 end
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30 t_sort(index, function(a, b) return _handlers[a] > _handlers[b]; end);
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31 handlers[event] = index;
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32 return index;
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33 end;
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34 setmetatable(handlers, { __index = _rebuild_index });
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35 local function add_handler(event, handler, priority)
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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] = priority or 0;
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39 else
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40 map = {[handler] = priority or 0};
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41 event_map[event] = map;
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42 end
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43 handlers[event] = nil;
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44 end;
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45 local function remove_handler(event, handler)
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46 local map = event_map[event];
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47 if map then
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48 map[handler] = nil;
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49 handlers[event] = nil;
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50 if next(map) == nil then
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51 event_map[event] = nil;
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52 end
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53 end
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54 end;
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55 local function add_handlers(handlers)
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56 for event, handler in pairs(handlers) do
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57 add_handler(event, handler);
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58 end
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59 end;
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60 local function remove_handlers(handlers)
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61 for event, handler in pairs(handlers) do
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62 remove_handler(event, handler);
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63 end
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64 end;
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65 local function _fire_event(event_name, event_data)
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66 local h = handlers[event_name];
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67 if h then
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68 for i=1,#h do
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69 local ret = h[i](event_data);
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70 if ret ~= nil then return ret; end
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71 end
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72 end
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73 end;
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74 local function fire_event(event_name, event_data)
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75 local w = wrappers[event_name] or global_wrappers;
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76 if w then
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77 local curr_wrapper = #w;
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78 local function c(event_name, event_data)
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79 curr_wrapper = curr_wrapper - 1;
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80 if curr_wrapper == 0 then
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81 if global_wrappers == nil or w == global_wrappers then
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82 return _fire_event(event_name, event_data);
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83 end
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84 w, curr_wrapper = global_wrappers, #global_wrappers;
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85 return w[curr_wrapper](c, event_name, event_data);
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86 else
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87 return w[curr_wrapper](c, event_name, event_data);
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88 end
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89 end
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90 return w[curr_wrapper](c, event_name, event_data);
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91 end
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92 return _fire_event(event_name, event_data);
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93 end
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94 local function add_wrapper(event_name, wrapper)
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95 local w;
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96 if event_name == nil then
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97 w = global_wrappers;
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98 if not w then
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99 w = {};
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100 global_wrappers = w;
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101 end
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102 else
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103 w = wrappers[event_name];
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104 if not w then
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105 w = {};
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106 wrappers[event_name] = w;
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107 end
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108 end
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109 w[#w+1] = wrapper;
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110 end
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111 local function remove_wrapper(event_name, wrapper)
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112 local w;
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113 if event_name == nil then
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114 w = global_wrappers;
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115 else
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116 w = wrappers[event_name];
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117 end
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118 if not w then return; end
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119 for i = #w, 1 do
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120 if w[i] == wrapper then
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121 table.remove(w, i);
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122 end
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123 end
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124 if #w == 0 then
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125 if event_name == nil then
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126 global_wrappers = nil;
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127 else
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128 wrappers[event_name] = nil;
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129 end
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130 end
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131 end
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132 return {
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133 add_handler = add_handler;
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134 remove_handler = remove_handler;
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135 add_handlers = add_handlers;
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136 remove_handlers = remove_handlers;
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137 wrappers = {
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138 add_handler = add_wrapper;
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139 remove_handler = remove_wrapper;
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140 };
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141 add_wrapper = add_wrapper;
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142 remove_wrapper = remove_wrapper;
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143 fire_event = fire_event;
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144 _handlers = handlers;
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145 _event_map = event_map;
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146 };
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147 end
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148
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149 return _M;