prosody
5de6b93d0190
util/events.lua

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util/events.lua @ 6777:5de6b93d0190

util.*: Remove use of module() function, make all module functions local and return them in a table at the end
author Kim Alvefur <zash@zash.se>
date Sat, 21 Feb 2015 10:36:37 +0100
parent 6665:e923d7cb8430
child 7039:138241cc1b3a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 local handlers = {};
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21 local global_wrappers;
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22 local wrappers = {};
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23 local event_map = {};
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24 local function _rebuild_index(handlers, event)
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25 local _handlers = event_map[event];
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26 if not _handlers or next(_handlers) == nil then return; end
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27 local index = {};
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28 for handler in pairs(_handlers) do
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29 t_insert(index, handler);
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30 end
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31 t_sort(index, function(a, b) return _handlers[a] > _handlers[b]; end);
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32 handlers[event] = index;
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33 return index;
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34 end;
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35 setmetatable(handlers, { __index = _rebuild_index });
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36 local function add_handler(event, handler, priority)
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37 local map = event_map[event];
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38 if map then
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39 map[handler] = priority or 0;
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40 else
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41 map = {[handler] = priority or 0};
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42 event_map[event] = map;
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43 end
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44 handlers[event] = nil;
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45 end;
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46 local function remove_handler(event, handler)
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47 local map = event_map[event];
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48 if map then
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49 map[handler] = nil;
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50 handlers[event] = nil;
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51 if next(map) == nil then
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52 event_map[event] = nil;
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53 end
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54 end
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55 end;
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56 local function get_handlers(event)
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57 return handlers[event];
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58 end;
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59 local function add_handlers(handlers)
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60 for event, handler in pairs(handlers) do
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61 add_handler(event, handler);
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62 end
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63 end;
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64 local function remove_handlers(handlers)
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65 for event, handler in pairs(handlers) do
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66 remove_handler(event, handler);
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67 end
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68 end;
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69 local function _fire_event(event_name, event_data)
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70 local h = handlers[event_name];
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71 if h then
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72 for i=1,#h do
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73 local ret = h[i](event_data);
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74 if ret ~= nil then return ret; end
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75 end
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76 end
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77 end;
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78 local function fire_event(event_name, event_data)
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79 local w = wrappers[event_name] or global_wrappers;
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80 if w then
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81 local curr_wrapper = #w;
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82 local function c(event_name, event_data)
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83 curr_wrapper = curr_wrapper - 1;
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84 if curr_wrapper == 0 then
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85 if global_wrappers == nil or w == global_wrappers then
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86 return _fire_event(event_name, event_data);
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87 end
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88 w, curr_wrapper = global_wrappers, #global_wrappers;
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89 return w[curr_wrapper](c, event_name, event_data);
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90 else
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91 return w[curr_wrapper](c, event_name, event_data);
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92 end
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93 end
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94 return w[curr_wrapper](c, event_name, event_data);
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95 end
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96 return _fire_event(event_name, event_data);
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97 end
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98 local function add_wrapper(event_name, wrapper)
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99 local w;
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100 if event_name == false then
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101 w = global_wrappers;
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102 if not w then
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103 w = {};
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104 global_wrappers = w;
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105 end
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106 else
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107 w = wrappers[event_name];
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108 if not w then
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109 w = {};
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110 wrappers[event_name] = w;
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111 end
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112 end
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113 w[#w+1] = wrapper;
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114 end
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115 local function remove_wrapper(event_name, wrapper)
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116 local w;
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117 if event_name == false then
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118 w = global_wrappers;
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119 else
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120 w = wrappers[event_name];
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.)
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121 end
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.)
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122 if not w then return; end
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.)
Matthew Wild <mwild1@gmail.com>
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123 for i = #w, 1 do
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.)
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124 if w[i] == wrapper then
6648
999434eb1bbf util.events: Add local reference to table.remove (fixes traceback)
Kim Alvefur <zash@zash.se>
parents: 6641
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125 t_remove(w, i);
6638
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parents: 5776
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126 end
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.)
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parents: 5776
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127 end
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.)
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parents: 5776
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128 if #w == 0 then
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.)
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parents: 5776
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129 if event_name == nil then
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.)
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parents: 5776
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130 global_wrappers = nil;
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131 else
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parents: 5776
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132 wrappers[event_name] = nil;
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parents: 5776
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133 end
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.)
Matthew Wild <mwild1@gmail.com>
parents: 5776
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134 end
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.)
Matthew Wild <mwild1@gmail.com>
parents: 5776
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135 end
1507
92357dffe743 util.events: Convert from Windows line endings
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parents: 1417
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136 return {
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137 add_handler = add_handler;
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138 remove_handler = remove_handler;
3499
91c55ae31ef3 util.events: Fixed the exposed API for adding/removing sets of event handlers.
Waqas Hussain <waqas20@gmail.com>
parents: 3498
diff changeset
139 add_handlers = add_handlers;
91c55ae31ef3 util.events: Fixed the exposed API for adding/removing sets of event handlers.
Waqas Hussain <waqas20@gmail.com>
parents: 3498
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140 remove_handlers = remove_handlers;
6664
5466f24e51c9 util.events: Add get_handlers() method
Matthew Wild <mwild1@gmail.com>
parents: 6641
diff changeset
141 get_handlers = get_handlers;
6638
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parents: 5776
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142 wrappers = {
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.)
Matthew Wild <mwild1@gmail.com>
parents: 5776
diff changeset
143 add_handler = add_wrapper;
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.)
Matthew Wild <mwild1@gmail.com>
parents: 5776
diff changeset
144 remove_handler = remove_wrapper;
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.)
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parents: 5776
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145 };
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.)
Matthew Wild <mwild1@gmail.com>
parents: 5776
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146 add_wrapper = add_wrapper;
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.)
Matthew Wild <mwild1@gmail.com>
parents: 5776
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147 remove_wrapper = remove_wrapper;
1507
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Matthew Wild <mwild1@gmail.com>
parents: 1417
diff changeset
148 fire_event = fire_event;
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149 _handlers = handlers;
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parents: 1417
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150 _event_map = event_map;
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parents: 1417
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151 };
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parents: 1417
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152 end
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parents: 1417
diff changeset
153
6777
5de6b93d0190 util.*: Remove use of module() function, make all module functions local and return them in a table at the end
Kim Alvefur <zash@zash.se>
parents: 6665
diff changeset
154 return {
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Kim Alvefur <zash@zash.se>
parents: 6665
diff changeset
155 new = new;
5de6b93d0190 util.*: Remove use of module() function, make all module functions local and return them in a table at the end
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parents: 6665
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156 };