NAME
Ryu::Observable - plus ça change
DESCRIPTION
This is by way of being a thing that lets you set up subscriptions on things so that you can be notified when said things are in some way not the same as the things they used to be, but are indeed now possessed of some detectable difference which may be of relevance to the thing that makes use of this thing which notifies as per the aforementioned conditions.
METHODS
Public API, such as it is.
as_string
Returns the string representation of this value.
as_number
Returns the numeric representation of this value.
new
Instantiates with the given value.
my $observed = Ryu::Observable->new('whatever');subscribe
Requests notifications when the value changes.
my $observed = Ryu::Observable->new('whatever')
->subscribe(sub { print "New value - $_\n" });unsubscribe
Removes an existing callback.
my $code;
my $observed = Ryu::Observable->new('whatever')
->subscribe($code = sub { print "New value - $_\n" })
->set_string('test')
->unsubscribe($code);set
Sets the value to the given scalar, then notifies all subscribers (regardless of whether the value has changed or not).
value
Returns the raw value.
set_numeric
Applies a new numeric value, and notifies subscribers if the value is numerically different to the previous one (or if we had no previous value).
Returns $self.
set_string
Applies a new string value, and notifies subscribers if the value stringifies to a different value than the previous one (or if we had no previous value).
Returns $self.
source
Returns a Ryu::Source, which will emit each new value until the observable is destroyed.
METHODS - Internal
Don't use these.
notify_all
Notifies all currently-subscribed callbacks with the current value.
AUTHOR
Tom Molesworth <TEAM@cpan.org>
LICENSE
Copyright Tom Molesworth 2011-2018. Licensed under the same terms as Perl itself.