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package Ryu::Observable; |
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90113
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use strict; |
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use warnings; |
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use utf8; |
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our $VERSION = '3.000'; # VERSION |
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our $AUTHORITY = 'cpan:TEAM'; # AUTHORITY |
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=encoding utf8 |
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=head1 NAME |
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Ryu::Observable - plus ça change |
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=head1 SYNOPSIS |
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# Set initial value |
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my $observed = Ryu::Observable->new(123) |
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# and a callback for any changes |
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->subscribe(sub { print "New value, is now: $_\n" }); |
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# Basic numeric increment/decrement should trigger a notification |
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++$observed; |
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# To assign a new value, use ->set_numeric or ->set_string |
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$observed->set_numeric(88); |
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=head1 DESCRIPTION |
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Simple monitorable variables. |
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=cut |
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use overload |
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'""' => sub { shift->as_string }, |
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'0+' => sub { shift->as_number }, |
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'++' => sub { my $v = ++$_[0]->{value}; $_[0]->notify_all; $v }, |
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'--' => sub { my $v = --$_[0]->{value}; $_[0]->notify_all; $v }, |
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'bool' => sub { !!shift->{value} }, |
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fallback => 1; |
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use Scalar::Util; |
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use List::UtilsBy; |
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use Ryu::Source; |
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715
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=head1 METHODS |
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Public API, such as it is. |
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=head2 as_string |
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Returns the string representation of this value. |
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=cut |
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sub as_string { '' . shift->{value} } |
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=head2 as_number |
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Returns the numeric representation of this value. |
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=cut |
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sub as_number { 0 + shift->{value} } |
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67
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=head2 new |
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Instantiates with the given value. |
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my $observed = Ryu::Observable->new('whatever'); |
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=cut |
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sub new { bless { value => $_[1] }, $_[0] } |
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=head2 subscribe |
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Requests notifications when the value changes. |
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my $observed = Ryu::Observable->new('whatever') |
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->subscribe(sub { print "New value - $_\n" }); |
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=cut |
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sub subscribe { my $self = shift; push @{$self->{subscriptions}}, @_; $self } |
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88
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=head2 unsubscribe |
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90
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Removes an existing callback. |
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92
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my $code; |
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my $observed = Ryu::Observable->new('whatever') |
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->subscribe($code = sub { print "New value - $_\n" }) |
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->set_string('test') |
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->unsubscribe($code); |
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98
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=cut |
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sub unsubscribe { |
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my ($self, @code) = @_; |
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for my $addr (map Scalar::Util::refaddr($_), @code) { |
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List::UtilsBy::extract_by { Scalar::Util::refaddr($_) == $addr } @{$self->{subscriptions}}; |
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104
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} |
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$self |
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} |
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108
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=head2 set |
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Sets the value to the given scalar, then notifies all subscribers (regardless |
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of whether the value has changed or not). |
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113
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=cut |
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115
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sub set { my ($self, $v) = @_; $self->{value} = $v; $self->notify_all } |
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3
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116
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=head2 value |
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119
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Returns the raw value. |
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121
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=cut |
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123
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sub value { shift->{value} } |
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125
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=head2 set_numeric |
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127
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Applies a new numeric value, and notifies subscribers if the value is numerically |
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different to the previous one (or if we had no previous value). |
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130
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Returns C<$self>. |
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132
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=cut |
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134
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sub set_numeric { |
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my ($self, $v) = @_; |
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my $prev = $self->{value}; |
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return $self if defined($prev) && $prev == $v; |
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$self->{value} = $v; |
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$self->notify_all |
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} |
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142
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=head2 set_string |
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144
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Applies a new string value, and notifies subscribers if the value stringifies to a |
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different value than the previous one (or if we had no previous value). |
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147
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Returns C<$self>. |
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149
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=cut |
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151
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sub set_string { |
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my ($self, $v) = @_; |
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1
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3
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my $prev = $self->{value}; |
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1
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50
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33
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return $self if defined($prev) && $prev eq $v; |
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$self->{value} = $v; |
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3
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$self->notify_all |
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} |
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159
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=head2 source |
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161
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Returns a L, which will emit each new value |
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until the observable is destroyed. |
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164
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=cut |
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166
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sub source { |
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my ($self) = @_; |
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$self->{source} //= do { |
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1
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7
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my $src = Ryu::Source->new; |
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1
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5
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Scalar::Util::weaken(my $copy = $self); |
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$src->completed->on_ready(sub { |
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159
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delete $copy->{source} if $copy |
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}); |
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$src; |
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}; |
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} |
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178
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=head1 METHODS - Internal |
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180
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Don't use these. |
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182
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=head2 notify_all |
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184
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Notifies all currently-subscribed callbacks with the current value. |
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186
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=cut |
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188
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sub notify_all { |
189
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3
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1
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my $self = shift; |
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my $v = $self->{value}; |
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3
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$self->{source}->emit($v) if $self->{source}; |
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5
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for my $sub (@{$self->{subscriptions}}) { |
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2
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11
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$sub->($_) for $v; |
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} |
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$self |
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3
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2542
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} |
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198
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sub DESTROY { |
199
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8
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2977
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my ($self) = @_; |
200
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8
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50
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32
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return if ${^GLOBAL_PHASE} eq 'DESTRUCT'; |
201
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8
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100
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20
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if(my $src = $self->{source}) { |
202
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1
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5
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$src->finish; |
203
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} |
204
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8
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18
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delete $self->{value}; |
205
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38
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return; |
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} |
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208
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1; |
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210
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__END__ |