NAME

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

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      {...}

DESCRIPTION

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

EVENTS

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

   error
         $reactor->on(error => sub {
           my ($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.

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

METHODS

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

   again
         $reactor->again($id);

       Restart timer. Meant to be overloaded in a subclass. Note that this method requires an
       active timer.

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

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

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

   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 invoked twice if handle becomes readable and writable
         $reactor->io($handle => sub {
           my ($reactor, $writable) = @_;
           say $writable ? 'Handle is writable' : 'Handle is readable';
         });

   is_running
         my $bool = $reactor->is_running;

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

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

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

   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);

   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.

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

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

   reset
         $reactor->reset;

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

   start
         $reactor->start;

       Start watching for I/O and timer events, this will block until "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;

   stop
         $reactor->stop;

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

   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.

   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);

SEE ALSO

       Mojolicious, Mojolicious::Guides, <http://mojolicio.us>.