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Rename

package Mojo::Reactor;
use Mojo::Base 'Mojo::EventEmitter';

use Carp qw(croak);
use Config;
use Mojo::Loader qw(load_class);

my %DETECTED;

sub again { croak 'Method "again" not implemented by subclass' }

sub detect {
  my $default = 'Mojo::Reactor::' . ($Config{d_pseudofork} ? 'Poll' : 'EV');
  my $try     = $ENV{MOJO_REACTOR} || $default;
  return $DETECTED{$try} ||= load_class($try) ? 'Mojo::Reactor::Poll' : $try;
}

sub io         { croak 'Method "io" not implemented by subclass' }
sub is_running { croak 'Method "is_running" not implemented by subclass' }
sub next_tick  { croak 'Method "next_tick" not implemented by subclass' }
sub one_tick   { croak 'Method "one_tick" not implemented by subclass' }
sub recurring  { croak 'Method "recurring" not implemented by subclass' }
sub remove     { croak 'Method "remove" not implemented by subclass' }
sub reset      { croak 'Method "reset" not implemented by subclass' }
sub start      { croak 'Method "start" not implemented by subclass' }
sub stop       { croak 'Method "stop" not implemented by subclass' }
sub timer      { croak 'Method "timer" not implemented by subclass' }
sub watch      { croak 'Method "watch" not implemented by subclass' }

=encoding utf8

=head1 NAME

Mojo::Reactor - Low-level event reactor base class

=head1 SYNOPSIS

package Mojo::Reactor::MyEventLoop;
  use Mojo::Base 'Mojo::Reactor';

sub again      {...}
  sub io         {...}
  sub is_running {...}
  sub next_tick  {...}
  sub one_tick   {...}
  sub recurring  {...}
  sub remove     {...}
  sub reset      {...}
  sub start      {...}
  sub stop       {...}
  sub timer      {...}
  sub watch      {...}

=head1 DESCRIPTION

L<Mojo::Reactor> is an abstract base class for low-level event reactors, like L<Mojo::Reactor::EV> and
L<Mojo::Reactor::Poll>.

=head1 EVENTS

L<Mojo::Reactor> inherits all events from L<Mojo::EventEmitter> and can emit the following new ones.

=head2 error

$reactor->on(error => sub ($reactor, $err) {...});

Emitted for exceptions caught in callbacks, fatal if unhandled. Note that if this event is unhandled or fails it might
kill your program, so you need to be careful.

$reactor->on(error => sub ($reactor, $err) { say "Something very bad happened: $err" });

=head1 METHODS

L<Mojo::Reactor> inherits all methods from L<Mojo::EventEmitter> and implements the following new ones.

=head2 again

$reactor->again($id);
  $reactor->again($id, 0.5);

Restart timer and optionally change the invocation time. Meant to be overloaded in a subclass. Note that this method
requires an active timer.

=head2 detect

my $class = Mojo::Reactor->detect;

Detect and load the best reactor implementation available, will try the value of the C<MOJO_REACTOR> environment
variable, L<Mojo::Reactor::EV> or L<Mojo::Reactor::Poll>.

# Instantiate best reactor implementation available
  my $reactor = Mojo::Reactor->detect->new;

=head2 io

$reactor = $reactor->io($handle => sub {...});

Watch handle for I/O events, invoking the callback whenever handle becomes readable or writable. Meant to be overloaded
in a subclass.

# Callback will be executed twice if handle becomes readable and writable
  $reactor->io($handle => sub ($reactor, $writable) {
    say $writable ? 'Handle is writable' : 'Handle is readable';
  });

=head2 is_running

my $bool = $reactor->is_running;

Check if reactor is running. Meant to be overloaded in a subclass.

=head2 next_tick

my $undef = $reactor->next_tick(sub {...});

Execute callback as soon as possible, but not before returning or other callbacks that have been registered with this
method, always returns C<undef>. Meant to be overloaded in a subclass.

=head2 one_tick

$reactor->one_tick;

Run reactor until an event occurs. Note that this method can recurse back into the reactor, so you need to be careful.
Meant to be overloaded in a subclass.

# Don't block longer than 0.5 seconds
  my $id = $reactor->timer(0.5 => sub {});
  $reactor->one_tick;
  $reactor->remove($id);

=head2 recurring

my $id = $reactor->recurring(0.25 => sub {...});

Create a new recurring timer, invoking the callback repeatedly after a given amount of time in seconds. Meant to be
overloaded in a subclass.

=head2 remove

my $bool = $reactor->remove($handle);
  my $bool = $reactor->remove($id);

Remove handle or timer. Meant to be overloaded in a subclass.

=head2 reset

$reactor->reset;

Remove all handles and timers. Meant to be overloaded in a subclass.

=head2 start

$reactor->start;

Start watching for I/O and timer events, this will block until L</"stop"> is called. Note that some reactors stop
automatically if there are no events being watched anymore. Meant to be overloaded in a subclass.

# Start reactor only if it is not running already
  $reactor->start unless $reactor->is_running;

=head2 stop

$reactor->stop;

Stop watching for I/O and timer events. Meant to be overloaded in a subclass.

=head2 timer

my $id = $reactor->timer(0.5 => sub {...});

Create a new timer, invoking the callback after a given amount of time in seconds. Meant to be overloaded in a
subclass.

=head2 watch

$reactor = $reactor->watch($handle, $readable, $writable);

Change I/O events to watch handle for with true and false values. Meant to be overloaded in a subclass. Note that this
method requires an active I/O watcher.

# Watch only for readable events
  $reactor->watch($handle, 1, 0);

# Watch only for writable events
  $reactor->watch($handle, 0, 1);

# Watch for readable and writable events
  $reactor->watch($handle, 1, 1);

# Pause watching for events
  $reactor->watch($handle, 0, 0);

=head1 SEE ALSO

L<Mojolicious>, L<Mojolicious::Guides>, L<https://mojolicious.org>.

=cut