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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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7
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54 shift;
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0
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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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7
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62 $globalEventTable->Invoke($class,@_);
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0
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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 $this->SUPER::CTOR();
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87
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88 $this->{$Handlers} = {};
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89 $this->{$Name} = shift;
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90 $this->{$Next} = shift;
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91 $this->{$NextId} = 1;
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92 }
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93
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94 sub get_handlers {
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95 my $this = shift;
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96 return values %{$this->{$Handlers}};
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97 }
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98
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99 sub Invoke {
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100 my $this = shift;
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101
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102 my $tmp;
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103 $tmp = $_ and local($_) or &$tmp(@_) foreach values %{$this->{$Handlers}};
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104
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105 $this->{$Next}->Invoke(@_) if $this->{$Next};
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106 }
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107
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108 sub Subscribe {
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109 my ($this,$consumer,$nameHandler) = @_;
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110
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111 my $id = $this->{$NextId} ++;
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112
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113 if (ref $consumer eq 'CODE') {
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114 $this->{$Handlers}{$id} = $consumer;
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115 } else {
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116 $nameHandler ||= $this->Name or die new IMPL::Exception('The name for the event handler method must be specified');
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117 my $method = $consumer->can($nameHandler) or die new IMPL::Exception('Can\'t find the event handler method',$nameHandler,$consumer);
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118
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119 weaken($consumer) if ref $consumer;
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120 $this->{$Handlers}{$id} = sub {
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121 unshift @_, $consumer;
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122 $consumer ? goto &$method : delete $this->{$Handlers}{$id};
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123 };
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124 }
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125
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126 return $id;
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127 }
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128
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129 sub Remove {
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130 my ($this,$id) = @_;
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131 return delete $this->{$Handlers}{$id};
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132 }
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133 1;
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7
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134
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135 __END__
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136 =pod
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137 =head1 SYNOPSIS
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138 package Foo;
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139 use base qw(IMPL::Object IMPL::Object::EventSource);
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140
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141 # declare events
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142 __PACKAGE__->CreateEvent('OnUpdate');
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143 __PACKAGE__->CreateStaticEvent('OnNewObject');
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144
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145 sub CTOR {
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146 my $this = shift;
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147 // rise static event
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148 $this->OnNewObject();
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149 }
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150
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151 sub Update {
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152 my ($this,$val) = @_;
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153
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154 // rise object event
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155 $this->OnUpdate($val);
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156 }
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157
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158 package Bar;
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159
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160 // subscribe static event
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161 Foo->OnNewObject->Subscribe(sub { warn "New $_[0] created" } );
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162
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163 sub LookForFoo {
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164 my ($this,$foo) = @_;
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165
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166 // subscribe object event
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167 $foo->OnUpdate->Subscribe($this,'OnFooUpdate');
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168 }
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169
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170 // event handler
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171 sub OnFooUpdate {
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172 my ($this,$sender,$value) = @_;
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173 }
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174
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175 =head1 DESCRIPTION
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176 .
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177 .
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178 .
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179 , , .
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180
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181 ( )
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182 . ,
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183 ( ).
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184 ,
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185 .
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186
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187 =head1 METHODS
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188 =level 4
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189 =back
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190
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191 =head1 EventTable
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192
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193 =cut |
