prosody
1c410b4f3a58
util/events.lua

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util/events.lua @ 7696:1c410b4f3a58

util.pubsub: Factor item storage cache into a per service configurable option
author Kim Alvefur <zash@zash.se>
date Sun, 16 Oct 2016 00:36:05 +0200
parent 7424:ba83ff7d9bd7
child 8382:e5d00bf4a4d5
child 8758:c380a22d52d5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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_remove = table.remove;
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13 local t_sort = table.sort;
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14 local setmetatable = setmetatable;
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15 local next = next;
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16
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17 local _ENV = nil;
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18
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19 local function new()
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20 -- Map event name to ordered list of handlers (lazily built): handlers[event_name] = array_of_handler_functions
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21 local handlers = {};
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22 -- Array of wrapper functions that wrap all events (nil if empty)
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23 local global_wrappers;
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24 -- Per-event wrappers: wrappers[event_name] = wrapper_function
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25 local wrappers = {};
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26 -- Event map: event_map[handler_function] = priority_number
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27 local event_map = {};
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28 -- Called on-demand to build handlers entries
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29 local function _rebuild_index(handlers, event)
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30 local _handlers = event_map[event];
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31 if not _handlers or next(_handlers) == nil then return; end
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32 local index = {};
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33 for handler in pairs(_handlers) do
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34 t_insert(index, handler);
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35 end
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36 t_sort(index, function(a, b) return _handlers[a] > _handlers[b]; end);
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37 handlers[event] = index;
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38 return index;
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39 end;
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40 setmetatable(handlers, { __index = _rebuild_index });
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41 local function add_handler(event, handler, priority)
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42 local map = event_map[event];
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43 if map then
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44 map[handler] = priority or 0;
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45 else
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46 map = {[handler] = priority or 0};
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47 event_map[event] = map;
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48 end
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49 handlers[event] = nil;
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50 end;
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51 local function remove_handler(event, handler)
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52 local map = event_map[event];
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53 if map then
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54 map[handler] = nil;
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55 handlers[event] = nil;
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56 if next(map) == nil then
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57 event_map[event] = nil;
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58 end
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59 end
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60 end;
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61 local function get_handlers(event)
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62 return handlers[event];
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63 end;
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64 local function add_handlers(handlers)
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65 for event, handler in pairs(handlers) do
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66 add_handler(event, handler);
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67 end
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68 end;
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69 local function remove_handlers(handlers)
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70 for event, handler in pairs(handlers) do
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71 remove_handler(event, handler);
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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 h = handlers[event_name];
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76 if h then
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77 for i=1,#h do
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78 local ret = h[i](event_data);
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79 if ret ~= nil then return ret; end
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80 end
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81 end
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82 end;
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83 local function fire_event(event_name, event_data)
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84 local w = wrappers[event_name] or global_wrappers;
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85 if w then
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86 local curr_wrapper = #w;
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87 local function c(event_name, event_data)
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88 curr_wrapper = curr_wrapper - 1;
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89 if curr_wrapper == 0 then
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90 if global_wrappers == nil or w == global_wrappers then
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91 return _fire_event(event_name, event_data);
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92 end
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93 w, curr_wrapper = global_wrappers, #global_wrappers;
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94 return w[curr_wrapper](c, event_name, event_data);
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95 else
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96 return w[curr_wrapper](c, event_name, event_data);
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97 end
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98 end
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99 return w[curr_wrapper](c, event_name, event_data);
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100 end
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101 return _fire_event(event_name, event_data);
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102 end
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103 local function add_wrapper(event_name, wrapper)
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104 local w;
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105 if event_name == false then
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106 w = global_wrappers;
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107 if not w then
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108 w = {};
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109 global_wrappers = w;
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110 end
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111 else
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112 w = wrappers[event_name];
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113 if not w then
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114 w = {};
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115 wrappers[event_name] = w;
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116 end
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117 end
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118 w[#w+1] = wrapper;
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119 end
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120 local function remove_wrapper(event_name, wrapper)
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121 local w;
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122 if event_name == false then
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123 w = global_wrappers;
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124 else
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125 w = wrappers[event_name];
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126 end
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127 if not w then return; end
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128 for i = #w, 1 do
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129 if w[i] == wrapper then
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130 t_remove(w, i);
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131 end
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132 end
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133 if #w == 0 then
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134 if event_name == false then
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135 global_wrappers = nil;
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136 else
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137 wrappers[event_name] = nil;
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138 end
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139 end
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140 end
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141 return {
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142 add_handler = add_handler;
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143 remove_handler = remove_handler;
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144 add_handlers = add_handlers;
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145 remove_handlers = remove_handlers;
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146 get_handlers = get_handlers;
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147 wrappers = {
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148 add_handler = add_wrapper;
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149 remove_handler = remove_wrapper;
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150 };
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151 add_wrapper = add_wrapper;
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152 remove_wrapper = remove_wrapper;
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153 fire_event = fire_event;
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154 _handlers = handlers;
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155 _event_map = event_map;
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156 };
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157 end
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158
6777
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159 return {
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160 new = new;
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161 };