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49
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1 package IMPL::Object::EventSource;
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2 use strict;
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3 require IMPL::Exception;
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4 use IMPL::Class::Property;
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5
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6 sub CreateEvent {
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7 my ($class,$event) = @_;
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8
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9 die new IMPL::Exception('A name is required for the event') unless $event;
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10
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11 (my $fullEventName = "$class$event") =~ s/:://g;
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12
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13 my $globalEventTable = new IMPL::Object::EventSource::EventTable($fullEventName);
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14 my $propEventTable = $event.'Table';
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15 public CreateProperty($class,$propEventTable,prop_all);
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16 public CreateProperty($class,$event,
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17 {
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18 get => sub {
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19 my $this = shift;
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20 if (not defined wantarray and caller(1) eq $class) {
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21 (ref $this ? $this->$propEventTable() || $globalEventTable : $globalEventTable)->Invoke($this);
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22 } else {
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23 if (ref $this) {
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24 if (my $table = $this->$propEventTable()) {
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25 return $table;
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26 } else {
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27 $table = new IMPL::Object::EventSource::EventTable($fullEventName,$globalEventTable);
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28 $this->$propEventTable($table);
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29 return $table;
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30 }
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31 } else {
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32 return $globalEventTable;
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33 }
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34 }
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35 },
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36 set => sub {
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37 (ref $_[0] ? $_[0]->$propEventTable() || $globalEventTable : $globalEventTable)->Invoke(@_);
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38 }
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39 }
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40 );
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41 }
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42
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43 sub CreateStaticEvent {
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44 my ($class,$event) = @_;
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45
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46 die new IMPL::Exception('A name is required for the event') unless $event;
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47
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48 (my $fullEventName = "$class$event") =~ s/:://g;
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49
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50 my $globalEventTable = new IMPL::Object::EventSource::EventTable($fullEventName);
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51
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52 no strict 'refs';
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53 *{"${class}::$event"} = sub {
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54 shift;
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55 if (not @_) {
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56 if (not defined wantarray and caller(1) eq $class) {
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57 $globalEventTable->Invoke($class);
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58 } else {
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59 return $globalEventTable;
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60 }
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61 } else {
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62 $globalEventTable->Invoke($class,@_);
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63 }
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64 };
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65 }
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66
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67 package IMPL::Object::EventSource::EventTable;
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68 use base qw(IMPL::Object);
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69 use IMPL::Class::Property;
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70 use IMPL::Class::Property::Direct;
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71 use Scalar::Util qw(weaken);
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72
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73 use overload
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74 '+=' => \&opSubscribe,
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75 'fallback' => 1;
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76
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77 BEGIN {
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78 public _direct property Name => prop_get;
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79 public _direct property Handlers => { get => \&get_handlers };
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80 private _direct property Next => prop_all;
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81 private _direct property NextId => prop_all;
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82 }
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83
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84 sub CTOR {
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85 my $this = shift;
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86
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87 $this->{$Handlers} = {};
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88 $this->{$Name} = shift;
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89 $this->{$Next} = shift;
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90 $this->{$NextId} = 1;
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91 }
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92
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93 sub get_handlers {
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94 my $this = shift;
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95 return values %{$this->{$Handlers}};
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96 }
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97
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98 sub Invoke {
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99 my $this = shift;
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100
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101 my $tmp;
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102 $tmp = $_ and local($_) or &$tmp(@_) foreach values %{$this->{$Handlers}};
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103
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104 $this->{$Next}->Invoke(@_) if $this->{$Next};
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105 }
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106
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107 sub Subscribe {
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108 my ($this,$consumer,$nameHandler) = @_;
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109
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110 my $id = $this->{$NextId} ++;
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111
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112 if (ref $consumer eq 'CODE') {
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113 $this->{$Handlers}{$id} = $consumer;
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114 } else {
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115 $nameHandler ||= $this->Name or die new IMPL::Exception('The name for the event handler method must be specified');
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116 my $method = $consumer->can($nameHandler) or die new IMPL::Exception('Can\'t find the event handler method',$nameHandler,$consumer);
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117
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118 weaken($consumer) if ref $consumer;
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119 $this->{$Handlers}{$id} = sub {
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120 unshift @_, $consumer;
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121 $consumer ? goto &$method : delete $this->{$Handlers}{$id};
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122 };
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123 }
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124
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125 return $id;
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126 }
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127
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128 sub Remove {
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129 my ($this,$id) = @_;
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130 return delete $this->{$Handlers}{$id};
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131 }
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132 1;
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133
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134 __END__
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135 =pod
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136 =head1 SYNOPSIS
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137 package Foo;
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138 use base qw(IMPL::Object IMPL::Object::EventSource);
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139
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140 # declare events
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141 __PACKAGE__->CreateEvent('OnUpdate');
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142 __PACKAGE__->CreateStaticEvent('OnNewObject');
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143
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144 sub CTOR {
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145 my $this = shift;
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146 // rise static event
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147 $this->OnNewObject();
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148 }
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149
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150 sub Update {
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151 my ($this,$val) = @_;
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152
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153 // rise object event
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154 $this->OnUpdate($val);
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155 }
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156
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157 package Bar;
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158
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159 // subscribe static event
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160 Foo->OnNewObject->Subscribe(sub { warn "New $_[0] created" } );
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161
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162 sub LookForFoo {
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163 my ($this,$foo) = @_;
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164
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165 // subscribe object event
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166 $foo->OnUpdate->Subscribe($this,'OnFooUpdate');
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167 }
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168
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169 // event handler
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170 sub OnFooUpdate {
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171 my ($this,$sender,$value) = @_;
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172 }
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173
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174 =head1 DESCRIPTION
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175 Позволяет объявлять и инициировать события. События делятся на статические и
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176 локальные. Статические события объявляются для класса и при возникновении
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177 данного события вызываются всегда все подписчики. Статические события могут быть
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178 вызваны как для класса, так и для объекта, что приведет к одинаковым результатам.
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179
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180 Локальные события состоят из статической (как статические события) и локальной
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181 части. Если подписываться на события класса, то обработчики будут вызываться при
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182 любых вариантах инициации данного события (как у статических событий). При
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183 подписке на события объекта, обработчик будет вызван только при возникновении
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184 событий у данного объекта.
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185
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186 =head1 METHODS
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187 =level 4
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188 =back
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189
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190 =head1 EventTable
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191
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192 =cut
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