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package Mojo::Pg::PubSub; | |
use Mojo::Base -base; | |
use Scalar::Util 'weaken'; | |
has 'pg'; | |
sub has_listeners { !!@{shift->{events}{shift()} || []} } | |
sub listen { | |
my ($self, $name, $cb) = @_; | |
push @{$self->{events}{$name}}, $cb; | |
$self->_db->listen($name) unless @{$self->{events}{$name}} > 1; | |
return $cb; | |
} | |
sub listeners { shift->{events}{shift()} || [] } | |
sub notify { | |
my ($self, $name, $payload) = @_; | |
$self->_db->notify($name, $payload); | |
return $self; | |
} | |
sub unlisten { | |
my ($self, $name, $cb) = @_; | |
# One | |
if ($cb) { | |
$self->{events}{$name} = [grep { $cb ne $_ } @{$self->{events}{$name}}]; | |
delete $self->{events}{$name} unless @{$self->{events}{$name}}; | |
} | |
# All | |
else { delete $self->{events}{$name} } | |
$self->_db->unlisten($name) unless @{$self->{events}{$name}}; | |
return $self; | |
} | |
sub _db { | |
my $self = shift; | |
return $self->{db} if $self->{db}; | |
my $db = $self->{db} = $self->pg->db; | |
weaken $self; | |
$db->on( | |
notification => sub { | |
my ($db, $name, $pid, $payload) = @_; | |
for my $cb (@{$self->{events}{$name}}) { $self->$cb($payload) } | |
} | |
); | |
$db->once( | |
close => sub { | |
delete $self->{db}; | |
my $db = $self->_db; | |
$db->listen($_) for keys %{$self->{events}}; | |
} | |
); | |
return $db; | |
} | |
1; |
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