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package Ryu::Observable; |
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use strict; |
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use warnings; |
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use utf8; |
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our $VERSION = '3.002'; # 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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# Slightly odd way of applying this - we don't want to require Sentinel, |
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# but the usual tricks of ->import or using *Sentinel::sentinel directly |
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# only work for the pure-perl version. So, we try to load it, making the |
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# syntax available, and we then use sentinel() as if it were a function... |
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# providing a fallback *sentinel only when the load failed. |
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BEGIN { |
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eval { |
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require Sentinel; |
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Sentinel->import; |
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1 |
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} or do { |
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*sentinel = sub { die 'This requires the Sentinel module to be installed' }; |
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} |
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} |
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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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=head2 as_numeric |
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Returns the numeric representation of this value. |
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(this method is available as C or C, both operate the same way) |
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=cut |
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84
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sub as_number { 0 + shift->{value} } |
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86
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*as_numeric = *as_number; |
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88
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=head2 new |
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90
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Instantiates with the given value. |
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92
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my $observed = Ryu::Observable->new('whatever'); |
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94
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=cut |
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96
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1
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7603
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sub new { bless { value => $_[1] }, $_[0] } |
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98
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=head2 subscribe |
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100
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Requests notifications when the value changes. |
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102
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my $observed = Ryu::Observable->new('whatever') |
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->subscribe(sub { print "New value - $_\n" }); |
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105
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=cut |
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107
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sub subscribe { my $self = shift; push @{$self->{subscriptions}}, @_; $self } |
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109
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=head2 unsubscribe |
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111
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Removes an existing callback. |
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113
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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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119
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=cut |
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121
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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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125
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} |
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$self |
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} |
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129
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=head2 set |
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131
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Sets the value to the given scalar, then notifies all subscribers (regardless |
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of whether the value has changed or not). |
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134
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=cut |
135
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136
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1
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281
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sub set { my ($self, $v) = @_; $self->{value} = $v; $self->notify_all } |
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3
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1
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3
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137
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138
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=head2 value |
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140
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Returns the raw value. |
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142
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=cut |
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144
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sub value { shift->{value} } |
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146
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=head2 set_numeric |
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148
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=head2 set_number |
149
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150
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Applies a new numeric value, and notifies subscribers if the value is numerically |
151
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different to the previous one (or if we had no previous value). |
152
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153
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Returns C<$self>. |
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155
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(this method is available as C or C, both operate the same way) |
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157
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=cut |
158
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159
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sub set_numeric { |
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my ($self, $v) = @_; |
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my $prev = $self->{value}; |
162
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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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167
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*set_number = *set_numeric; |
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169
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=head2 set_string |
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171
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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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174
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Returns C<$self>. |
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176
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=cut |
177
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178
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sub set_string { |
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my ($self, $v) = @_; |
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my $prev = $self->{value}; |
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1
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return $self if defined($prev) && $prev eq $v; |
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1
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3
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$self->{value} = $v; |
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$self->notify_all |
184
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} |
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186
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=head2 source |
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188
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Returns a L, which will emit each new value |
189
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until the observable is destroyed. |
190
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191
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=cut |
192
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193
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sub source { |
194
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2
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2
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1
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7
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my ($self) = @_; |
195
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2
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66
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10
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$self->{source} //= do { |
196
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1
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6
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my $src = Ryu::Source->new; |
197
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1
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4
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Scalar::Util::weaken(my $copy = $self); |
198
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$src->completed->on_ready(sub { |
199
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1
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50
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1
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130
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delete $copy->{source} if $copy |
200
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1
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5
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}); |
201
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1
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67
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$src; |
202
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}; |
203
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} |
204
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205
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=head1 LVALUE METHODS |
206
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207
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B<< These require L to be installed >>. |
208
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209
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=head2 lvalue_str |
210
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211
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Returns a L lvalue accessor for the string value. |
212
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213
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This can be used with refaliasing or C loops to reduce typing: |
214
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215
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for($observable->lvalue_str) { |
216
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chomp; |
217
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s/_/-/g; |
218
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} |
219
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220
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|
Any attempt to retrieve or set the value will be redirected to L |
221
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|
or L as appropriate. |
222
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223
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=cut |
224
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|
225
|
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sub lvalue_str : lvalue { |
226
|
0
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|
|
0
|
1
|
0
|
my ($self) = @_; |
227
|
|
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|
|
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|
sentinel(get => sub { |
228
|
0
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|
|
0
|
|
0
|
return $self->as_string(shift); |
229
|
|
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|
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|
}, set => sub { |
230
|
0
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|
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0
|
|
0
|
return $self->set_string(shift); |
231
|
0
|
|
|
|
|
0
|
}); |
232
|
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|
|
} |
233
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|
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|
234
|
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|
=head2 lvalue_num |
235
|
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|
236
|
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|
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|
|
Returns a L lvalue accessor for the numeric value. |
237
|
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|
238
|
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|
This can be used with refaliasing or C loops to reduce typing: |
239
|
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|
240
|
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|
|
for($observable->lvalue_num) { |
241
|
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|
|
++$_; |
242
|
|
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|
|
$_ *= 3; |
243
|
|
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|
|
} |
244
|
|
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|
|
|
|
245
|
|
|
|
|
|
|
Any attempt to retrieve or set the value will be redirected to L |
246
|
|
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|
|
|
|
or L as appropriate. |
247
|
|
|
|
|
|
|
|
248
|
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|
|
|
|
=cut |
249
|
|
|
|
|
|
|
|
250
|
|
|
|
|
|
|
sub lvalue_num : lvalue { |
251
|
0
|
|
|
0
|
1
|
0
|
my ($self) = @_; |
252
|
|
|
|
|
|
|
sentinel(get => sub { |
253
|
0
|
|
|
0
|
|
0
|
return $self->as_number(shift); |
254
|
|
|
|
|
|
|
}, set => sub { |
255
|
0
|
|
|
0
|
|
0
|
return $self->set_number(shift); |
256
|
0
|
|
|
|
|
0
|
}); |
257
|
|
|
|
|
|
|
} |
258
|
|
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|
|
259
|
|
|
|
|
|
|
=head1 METHODS - Internal |
260
|
|
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|
|
|
|
|
261
|
|
|
|
|
|
|
Don't use these. |
262
|
|
|
|
|
|
|
|
263
|
|
|
|
|
|
|
=head2 notify_all |
264
|
|
|
|
|
|
|
|
265
|
|
|
|
|
|
|
Notifies all currently-subscribed callbacks with the current value. |
266
|
|
|
|
|
|
|
|
267
|
|
|
|
|
|
|
=cut |
268
|
|
|
|
|
|
|
|
269
|
|
|
|
|
|
|
sub notify_all { |
270
|
3
|
|
|
3
|
1
|
4
|
my $self = shift; |
271
|
3
|
|
|
|
|
23
|
my $v = $self->{value}; |
272
|
3
|
100
|
|
|
|
14
|
$self->{source}->emit($v) if $self->{source}; |
273
|
3
|
|
|
|
|
5
|
for my $sub (@{$self->{subscriptions}}) { |
|
3
|
|
|
|
|
7
|
|
274
|
2
|
|
|
|
|
8
|
$sub->($_) for $v; |
275
|
|
|
|
|
|
|
} |
276
|
|
|
|
|
|
|
$self |
277
|
3
|
|
|
|
|
2014
|
} |
278
|
|
|
|
|
|
|
|
279
|
|
|
|
|
|
|
sub DESTROY { |
280
|
8
|
|
|
8
|
|
2418
|
my ($self) = @_; |
281
|
8
|
50
|
|
|
|
23
|
return if ${^GLOBAL_PHASE} eq 'DESTRUCT'; |
282
|
8
|
100
|
|
|
|
19
|
if(my $src = $self->{source}) { |
283
|
1
|
|
|
|
|
4
|
$src->finish; |
284
|
|
|
|
|
|
|
} |
285
|
8
|
|
|
|
|
13
|
delete $self->{value}; |
286
|
8
|
|
|
|
|
30
|
return; |
287
|
|
|
|
|
|
|
} |
288
|
|
|
|
|
|
|
|
289
|
|
|
|
|
|
|
1; |
290
|
|
|
|
|
|
|
|
291
|
|
|
|
|
|
|
__END__ |