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.\" ========================================================================
.\"
.IX Title "Mojo::EventEmitter 3pm"
.TH Mojo::EventEmitter 3pm "2014-09-21" "perl v5.20.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
Mojo::EventEmitter \- Event emitter base class
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&  package Cat;
\&  use Mojo::Base \*(AqMojo::EventEmitter\*(Aq;
\&
\&  # 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 \*(AqRAWR!\*(Aq for 1 .. $times;
\&  });
\&  $tiger\->poke;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Mojo::EventEmitter is a simple base class for event emitting objects.
.SH "EVENTS"
.IX Header "EVENTS"
Mojo::EventEmitter can emit the following events.
.SS "error"
.IX Subsection "error"
.Vb 4
\&  $e\->on(error => sub {
\&    my ($e, $err) = @_;
\&    ...
\&  });
.Ve
.PP
This is a special event for errors, it will not be emitted directly by this
class but is fatal if unhandled.
.PP
.Vb 4
\&  $e\->on(error => sub {
\&    my ($e, $err) = @_;
\&    say "This looks bad: $err";
\&  });
.Ve
.SH "METHODS"
.IX Header "METHODS"
Mojo::EventEmitter inherits all methods from Mojo::Base and
implements the following new ones.
.SS "catch"
.IX Subsection "catch"
.Vb 1
\&  $e = $e\->catch(sub {...});
.Ve
.PP
Subscribe to \*(L"error\*(R" event.
.PP
.Vb 2
\&  # Longer version
\&  $e\->on(error => sub {...});
.Ve
.SS "emit"
.IX Subsection "emit"
.Vb 2
\&  $e = $e\->emit(\*(Aqfoo\*(Aq);
\&  $e = $e\->emit(\*(Aqfoo\*(Aq, 123);
.Ve
.PP
Emit event.
.SS "has_subscribers"
.IX Subsection "has_subscribers"
.Vb 1
\&  my $bool = $e\->has_subscribers(\*(Aqfoo\*(Aq);
.Ve
.PP
Check if event has subscribers.
.SS "on"
.IX Subsection "on"
.Vb 1
\&  my $cb = $e\->on(foo => sub {...});
.Ve
.PP
Subscribe to event.
.PP
.Vb 4
\&  $e\->on(foo => sub {
\&    my ($e, @args) = @_;
\&    ...
\&  });
.Ve
.SS "once"
.IX Subsection "once"
.Vb 1
\&  my $cb = $e\->once(foo => sub {...});
.Ve
.PP
Subscribe to event and unsubscribe again after it has been emitted once.
.PP
.Vb 4
\&  $e\->once(foo => sub {
\&    my ($e, @args) = @_;
\&    ...
\&  });
.Ve
.SS "subscribers"
.IX Subsection "subscribers"
.Vb 1
\&  my $subscribers = $e\->subscribers(\*(Aqfoo\*(Aq);
.Ve
.PP
All subscribers for event.
.PP
.Vb 2
\&  # Unsubscribe last subscriber
\&  $e\->unsubscribe(foo => $e\->subscribers(\*(Aqfoo\*(Aq)\->[\-1]);
.Ve
.SS "unsubscribe"
.IX Subsection "unsubscribe"
.Vb 2
\&  $e = $e\->unsubscribe(\*(Aqfoo\*(Aq);
\&  $e = $e\->unsubscribe(foo => $cb);
.Ve
.PP
Unsubscribe from event.
.SH "DEBUGGING"
.IX Header "DEBUGGING"
You can set the \f(CW\*(C`MOJO_EVENTEMITTER_DEBUG\*(C'\fR environment variable to get some
advanced diagnostics information printed to \f(CW\*(C`STDERR\*(C'\fR.
.PP
.Vb 1
\&  MOJO_EVENTEMITTER_DEBUG=1
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Mojolicious, Mojolicious::Guides, <http://mojolicio.us>.