Mojo::EventEmitter - Event emitter base class
package Cat;
use Mojo::Base 'Mojo::EventEmitter';
# Emit events
sub poke {
my $self = shift;
$self->emit(roar => 3);
}
package main;
# Subscribe to events
my $tiger = Cat->new;
$tiger->on(roar => sub {
my ($tiger, $times) = @_;
say 'RAWR!' for 1 .. $times;
});
$tiger->poke;
Mojo::EventEmitter is a simple base class for event emitting objects.
Mojo::EventEmitter can emit the following events.
$e->on(error => sub {
my ($e, $err) = @_;
...
});
Emitted safely for event errors.
$e->on(error => sub {
my ($e, $err) = @_;
say "This looks bad: $err";
});
Mojo::EventEmitter inherits all methods from Mojo::Base and implements the following new ones.
$e = $e->emit('foo');
$e = $e->emit('foo', 123);
Emit event.
$e = $e->emit_safe('foo');
$e = $e->emit_safe('foo', 123);
Emit event safely and emit error event on failure.
my $success = $e->has_subscribers('foo');
Check if event has subscribers.
my $cb = $e->on(foo => sub {...});
Subscribe to event.
$e->on(foo => sub {
my ($e, @args) = @_;
...
});
my $cb = $e->once(foo => sub {...});
Subscribe to event and unsubscribe again after it has been emitted once.
$e->once(foo => sub {
my ($e, @args) = @_;
...
});
my $subscribers = $e->subscribers('foo');
All subscribers for event.
# Unsubscribe last subscriber
$e->unsubscribe(foo => $e->subscribers('foo')->[-1]);
$e = $e->unsubscribe('foo');
$e = $e->unsubscribe(foo => $cb);
Unsubscribe from event.
You can set the MOJO_EVENTEMITTER_DEBUG environment variable to get some advanced diagnostics information printed to STDERR.
MOJO_EVENTEMITTER_DEBUG=1
