annotate Lib/IMPL/Object/EventSource.pm @ 280:c6d0f889ef87

+IMPL::declare now supports meta attributes *bugfixes related to the typeof() operator
author cin
date Wed, 06 Feb 2013 02:15:48 +0400
parents 4ddb27ff4a0b
children
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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 parent qw(IMPL::Object);
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69 use IMPL::Class::Property;
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70 use Scalar::Util qw(weaken);
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71
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72 use overload
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73 '+=' => \&opSubscribe,
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74 'fallback' => 1;
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75
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76 BEGIN {
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77 public _direct property Name => prop_get;
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78 public _direct property Handlers => { get => \&get_handlers };
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79 private _direct property Next => prop_all;
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80 private _direct property NextId => prop_all;
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81 }
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82
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83 sub CTOR {
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84 my $this = shift;
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85
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86 $this->{$Handlers} = {};
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87 $this->{$Name} = shift;
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88 $this->{$Next} = shift;
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89 $this->{$NextId} = 1;
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90 }
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91
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92 sub get_handlers {
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93 my $this = shift;
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94 return values %{$this->{$Handlers}};
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95 }
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96
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97 sub Invoke {
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98 my $this = shift;
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99
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100 my $tmp;
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101 $tmp = $_ and local($_) or &$tmp(@_) foreach values %{$this->{$Handlers}};
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102
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103 $this->{$Next}->Invoke(@_) if $this->{$Next};
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104 }
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105
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106 sub Subscribe {
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107 my ($this,$consumer,$nameHandler) = @_;
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108
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109 my $id = $this->{$NextId} ++;
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110
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111 if (ref $consumer eq 'CODE') {
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112 $this->{$Handlers}{$id} = $consumer;
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113 } else {
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114 $nameHandler ||= $this->Name or die new IMPL::Exception('The name for the event handler method must be specified');
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115 my $method = $consumer->can($nameHandler) or die new IMPL::Exception('Can\'t find the event handler method',$nameHandler,$consumer);
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116
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117 weaken($consumer) if ref $consumer;
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118 $this->{$Handlers}{$id} = sub {
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119 unshift @_, $consumer;
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120 $consumer ? goto &$method : delete $this->{$Handlers}{$id};
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121 };
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122 }
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123
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124 return $id;
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125 }
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126
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127 sub Remove {
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128 my ($this,$id) = @_;
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129 return delete $this->{$Handlers}{$id};
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130 }
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131 1;
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132
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133 __END__
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134 =pod
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135 =head1 SYNOPSIS
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136 package Foo;
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137 use parent qw(IMPL::Object IMPL::Object::EventSource);
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138
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139 # declare events
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140 __PACKAGE__->CreateEvent('OnUpdate');
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141 __PACKAGE__->CreateStaticEvent('OnNewObject');
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142
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143 sub CTOR {
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144 my $this = shift;
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145 // rise static event
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146 $this->OnNewObject();
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147 }
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148
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149 sub Update {
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150 my ($this,$val) = @_;
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151
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152 // rise object event
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153 $this->OnUpdate($val);
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154 }
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155
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156 package Bar;
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157
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158 // subscribe static event
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159 Foo->OnNewObject->Subscribe(sub { warn "New $_[0] created" } );
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160
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161 sub LookForFoo {
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162 my ($this,$foo) = @_;
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163
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164 // subscribe object event
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165 $foo->OnUpdate->Subscribe($this,'OnFooUpdate');
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166 }
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167
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168 // event handler
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169 sub OnFooUpdate {
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170 my ($this,$sender,$value) = @_;
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171 }
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172
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173 =head1 DESCRIPTION
180
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174 Позволяет объявлять и инициировать события. События делятся на статические и
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175 локальные. Статические события объявляются для класса и при возникновении
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176 данного события вызываются всегда все подписчики. Статические события могут быть
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177 вызваны как для класса, так и для объекта, что приведет к одинаковым результатам.
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178
180
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179 Локальные события состоят из статической (как статические события) и локальной
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180 части. Если подписываться на события класса, то обработчики будут вызываться при
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181 любых вариантах инициации данного события (как у статических событий). При
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182 подписке на события объекта, обработчик будет вызван только при возникновении
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183 событий у данного объекта.
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184
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parents: 7
diff changeset
185 =head1 METHODS
16ada169ca75 migrating to the Eclipse IDE
wizard@linux-odin.local
parents: 7
diff changeset
186 =level 4
16ada169ca75 migrating to the Eclipse IDE
wizard@linux-odin.local
parents: 7
diff changeset
187 =back
16ada169ca75 migrating to the Eclipse IDE
wizard@linux-odin.local
parents: 7
diff changeset
188
16ada169ca75 migrating to the Eclipse IDE
wizard@linux-odin.local
parents: 7
diff changeset
189 =head1 EventTable
16ada169ca75 migrating to the Eclipse IDE
wizard@linux-odin.local
parents: 7
diff changeset
190
16ada169ca75 migrating to the Eclipse IDE
wizard@linux-odin.local
parents: 7
diff changeset
191 =cut