NAME
Mojo::IOWatcher - Async I/O Watcher
SYNOPSIS
use Mojo::IOWatcher;
# Watch if I/O handles become readable or writable
my $watcher = Mojo::IOWatcher->new;
$watcher->add($handle, on_readable => sub {
my ($watcher, $handle) = @_;
...
});
# Use timers
$watcher->timer(15 => sub {
my $watcher = shift;
$watcher->remove($handle);
print "Timeout!\n";
});
# And loop!
$watcher->one_tick('0.25') while 1;DESCRIPTION
Mojo::IOWatcher is a minimalistic async I/O watcher and the foundation of Mojo::IOLoop. Mojo::IOWatcher::EV is a good example for its extensibility. Note that this module is EXPERIMENTAL and might change without warning!
METHODS
Mojo::IOWatcher inherits all methods from Mojo::Base and implements the following new ones.
add
$watcher = $watcher->add($handle, on_readable => sub {...});Add handles and watch for I/O events.
These options are currently available:
on_readable-
Callback to be invoked once the handle becomes readable.
on_writable-
Callback to be invoked once the handle becomes writable.
cancel
my $success = $watcher->cancel($id);Cancel timer.
detect
my $class = Mojo::IOWatcher->detect;Detect and load the best watcher implementation available, will try the value of MOJO_IOWATCHER or Mojo::IOWatcher::EV. Note that this method is EXPERIMENTAL and might change without warning!
is_readable
my $readable = $watcher->is_readable($handle);Quick check if a handle is readable, useful for identifying tainted sockets.
not_writing
$watcher = $watcher->not_writing($handle);Only watch handle for readable events.
one_tick
$watcher->one_tick('0.25');Run for exactly one tick and watch for I/O and timer events.
recurring
my $id = $watcher->recurring(3 => sub {...});Create a new recurring timer, invoking the callback repeatedly after a given amount of seconds.
remove
$watcher = $watcher->remove($handle);Remove handle.
timer
my $id = $watcher->timer(3 => sub {...});Create a new timer, invoking the callback after a given amount of seconds.
writing
$watcher = $watcher->writing($handle);Watch handle for readable and writable events.
DEBUGGING
You can set the MOJO_IOWATCHER_DEBUG environment variable to get some advanced diagnostics information printed to STDERR.
MOJO_IOWATCHER_DEBUG=1