NAME
Mojo::Reactor - Low level event reactor base class
SYNOPSIS
package Mojo::Reactor::MyEventLoop;
use Mojo::Base 'Mojo::Reactor';
$ENV{MOJO_REACTOR} ||= 'Mojo::Reactor::MyEventLoop';
sub again {...}
sub io {...}
sub is_running {...}
sub one_tick {...}
sub recurring {...}
sub remove {...}
sub start {...}
sub stop {...}
sub timer {...}
sub watch {...}DESCRIPTION
Mojo::Reactor is an abstract base class for low level event reactors.
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 active timer. Meant to be overloaded in a subclass.
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_readable
my $bool = $reactor->is_readable($handle);Quick non-blocking check if a handle is readable, useful for identifying tainted sockets.
is_running
my $bool = $reactor->is_running;Check if reactor is running. 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.
# Invoke as soon as possible
$reactor->recurring(0 => sub { say 'Reactor tick.' });remove
my $bool = $reactor->remove($handle);
my $bool = $reactor->remove($id);Remove handle or timer. 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.
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.
# Invoke as soon as possible
$reactor->timer(0 => sub { say 'Next tick.' });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);