Mojo::Reactor::IOAsync - IO::Async backend for Mojo::Reactor


  use Mojo::Reactor::IOAsync;

  # Watch if handle becomes readable or writable
  my $reactor = Mojo::Reactor::IOAsync->new;
  $reactor->io($first => sub {
    my ($reactor, $writable) = @_;
    say $writable ? 'First handle is writable' : 'First handle is readable';

  # Change to watching only if handle becomes writable
  $reactor->watch($first, 0, 1);

  # Turn file descriptor into handle and watch if it becomes readable
  my $second = IO::Handle->new_from_fd($fd, 'r');
  $reactor->io($second => sub {
    my ($reactor, $writable) = @_;
    say $writable ? 'Second handle is writable' : 'Second handle is readable';
  })->watch($second, 1, 0);

  # Add a timer
  $reactor->timer(15 => sub {
    my $reactor = shift;
    say 'Timeout!';

  # Start reactor if necessary
  $reactor->start unless $reactor->is_running;

  # Or in an application using Mojo::IOLoop
  use Mojo::Reactor::IOAsync;
  use Mojo::IOLoop;
  # Or in a Mojolicious application
  $ MOJO_REACTOR=Mojo::Reactor::IOAsync hypnotoad script/myapp


Mojo::Reactor::IOAsync is an event reactor for Mojo::IOLoop that uses IO::Async. The usage is exactly the same as other Mojo::Reactor implementations such as Mojo::Reactor::Poll. Mojo::Reactor::IOAsync will be used as the default backend for Mojo::IOLoop if it is loaded before Mojo::IOLoop or any module using the loop. However, when invoking a Mojolicious application through morbo or hypnotoad, the reactor must be set as the default by setting the MOJO_REACTOR environment variable to Mojo::Reactor::IOAsync.


Mojo::Reactor::IOAsync inherits all events from Mojo::Reactor::Poll.


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


  my $reactor = Mojo::Reactor::IOAsync->new;

Construct a new Mojo::Reactor::IOAsync object.


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

Restart timer and optionally change the invocation time. Note that this method requires an active timer.


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

Watch handle for I/O events, invoking the callback whenever handle becomes readable or writable.

  # 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';



Run reactor until an event occurs or no events are being watched anymore. See "CAVEATS".

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


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

Create a new recurring timer, invoking the callback repeatedly after a given amount of time in seconds.


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

Remove handle or timer.



Remove all handles and timers.



Stop watching for I/O and timer events.


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

Create a new timer, invoking the callback after a given amount of time in seconds.


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

Change I/O events to watch handle for with true and false values. 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);


When using Mojo::IOLoop with IO::Async, the event loop must be controlled by Mojo::IOLoop or Mojo::Reactor::IOAsync, such as with the methods "start" in Mojo::Reactor::Poll, "stop", and "one_tick". Starting or stopping the event loop through IO::Async will not provide required functionality to Mojo::IOLoop applications.

Externally-added IO::Async notifiers will keep the Mojo::IOLoop loop running if they are added to the event loop as a notifier, see "NOTIFIER MANAGEMENT" in IO::Async::Loop.


Report any issues on the public bugtracker.


Dan Book,


Copyright 2015, Dan Book.

This library is free software; you may redistribute it and/or modify it under the terms of the Artistic License version 2.0.


Mojolicious, Mojo::IOLoop, IO::Async