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Dan Book

NAME

Role::EventEmitter - Event emitter role

SYNOPSIS

  package Cat;
  use Moo;
  with 'Role::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;

DESCRIPTION

Role::EventEmitter is a simple Role::Tiny role for event emitting objects based on Mojo::EventEmitter. This role can be applied to any hash-based object class such as those created with Class::Tiny, Moo, or Moose.

EVENTS

Role::EventEmitter can emit the following events.

error

  $e->on(error => sub {
    my ($e, $err) = @_;
    ...
  });

This is a special event for errors, it will not be emitted directly by this role but is fatal if unhandled.

  $e->on(error => sub {
    my ($e, $err) = @_;
    say "This looks bad: $err";
  });

METHODS

Role::EventEmitter composes the following methods.

catch

  $e = $e->catch(sub {...});

Subscribe to "error" event.

  # Longer version
  $e->on(error => sub {...});

emit

  $e = $e->emit('foo');
  $e = $e->emit('foo', 123);

Emit event.

has_subscribers

  my $bool = $e->has_subscribers('foo');

Check if event has subscribers.

on

  my $cb = $e->on(foo => sub {...});

Subscribe to event.

  $e->on(foo => sub {
    my ($e, @args) = @_;
    ...
  });

once

  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) = @_;
    ...
  });

subscribers

  my $subscribers = $e->subscribers('foo');

All subscribers for event.

  # Unsubscribe last subscriber
  $e->unsubscribe(foo => $e->subscribers('foo')->[-1]);

  # Change order of subscribers
  @{$e->subscribers('foo')} = reverse @{$e->subscribers('foo')};

unsubscribe

  $e = $e->unsubscribe('foo');
  $e = $e->unsubscribe(foo => $cb);

Unsubscribe from event.

DEBUGGING

You can set the ROLE_EVENTEMITTER_DEBUG environment variable to get some advanced diagnostics information printed to STDERR.

  ROLE_EVENTEMITTER_DEBUG=1

BUGS

Report any issues on the public bugtracker.

AUTHOR

Dan Book <dbook@cpan.org>

COPYRIGHT AND LICENSE

This software is Copyright (c) 2015 by Dan Book.

This is free software, licensed under:

  The Artistic License 2.0 (GPL Compatible)

SEE ALSO

Mojo::EventEmitter, Mixin::Event::Dispatch, Beam::Emitter