Mojo::IOWatcher - Non-blocking I/O watcher
use Mojo::IOWatcher; # Watch if handle becomes readable or writabe my $watcher = Mojo::IOWatcher->new; $watcher->io($handle => sub { my ($watcher, $handle, $writable) = @_; say $writable ? 'Handle is writable' : 'Handle is readable'; }); # Add a timer $watcher->timer(15 => sub { my $watcher = shift; $watcher->drop($handle); say 'Timeout!'; }); # Start and stop watcher $watcher->start; $watcher->stop;
Mojo::IOWatcher is a minimalistic non-blocking 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!
Mojo::IOWatcher can emit the following events.
error
$watcher->on(error => sub { my ($watcher, $err) = @_; ... });
Emitted safely if an error happens.
Mojo::IOWatcher inherits all methods from Mojo::EventEmitter and implements the following new ones.
detect
my $class = Mojo::IOWatcher->detect;
Detect and load the best watcher implementation available, will try the value of the MOJO_IOWATCHER environment variable or Mojo::IOWatcher::EV.
MOJO_IOWATCHER
drop
my $success = $watcher->drop($handle); my $success = $watcher->drop($id);
Drop handle or timer.
io
$watcher = $watcher->io($handle => sub {...});
Watch handle for I/O events, invoking the callback whenever handle becomes readable or writable.
is_readable
my $success = $watcher->is_readable($handle);
Quick check if a handle is readable, useful for identifying tainted sockets.
is_running
my $success = $watcher->is_running;
Check if watcher is running.
recurring
my $id = $watcher->recurring(3 => sub {...});
Create a new recurring timer, invoking the callback repeatedly after a given amount of seconds.
start
$watcher->start;
Start watching for I/O and timer events, this will block until stop is called.
stop
$watcher->stop;
Stop watching for I/O and timer events.
timer
my $id = $watcher->timer(3 => sub {...});
Create a new timer, invoking the callback after a given amount of seconds.
watch
$watcher = $watcher->watch($handle, $read, $write);
Change I/O events to watch handle for.
# Watch only for readable events $watcher->watch($handle, 1, 0); # Watch only for writable events $watcher->watch($handle, 0, 1); # Watch for readable and writable events $watcher->watch($handle, 1, 1); # Pause watching for events $watcher->watch($handle, 0, 0);
You can set the MOJO_IOWATCHER_DEBUG environment variable to get some advanced diagnostics information printed to STDERR.
MOJO_IOWATCHER_DEBUG
STDERR
MOJO_IOWATCHER_DEBUG=1
Mojolicious, Mojolicious::Guides, http://mojolicio.us.
To install Mojolicious, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Mojolicious
CPAN shell
perl -MCPAN -e shell install Mojolicious
For more information on module installation, please visit the detailed CPAN module installation guide.