Mojo::Reactor − Low−level event reactor base class
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 {...}
Mojo::Reactor is an abstract base class for low-level event reactors, like Mojo::Reactor::EV and Mojo::Reactor::Poll.
Mojo::Reactor inherits all events from Mojo::EventEmitter and can emit the following new ones.
$reactor−>on(error => sub ($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" });
Mojo::Reactor inherits all methods from Mojo::EventEmitter and implements the following new ones.
$reactor−>again($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.
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;
$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';
});
my $bool = $reactor−>is_running;
Check if reactor is running. Meant to be overloaded in a subclass.
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 "undef". Meant to be overloaded in a subclass.
$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);
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.
my $bool =
$reactor−>remove($handle);
my $bool = $reactor−>remove($id);
Remove handle or timer. Meant to be overloaded in a subclass.
$reactor−>reset;
Remove all handles and timers. Meant to be overloaded in a subclass.
$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;
$reactor−>stop;
Stop watching for I/O and timer events. Meant to be overloaded in a subclass.
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.
$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);
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