NAME

IO::Async::Timer::Periodic - event callback at regular intervals

SYNOPSIS

use IO::Async::Timer::Periodic;

use IO::Async::Loop;
my $loop = IO::Async::Loop->new;

my $timer = IO::Async::Timer::Periodic->new(
   interval => 60,

   on_tick => sub {
      print "You've had a minute\n";
   },
);

$timer->start;

$loop->add( $timer );

$loop->loop_forever;

DESCRIPTION

This subclass of IO::Async::Timer implements repeating events at regular clock intervals. The timing is not subject to how long it takes the callback to execute, but runs at regular intervals beginning at the time the timer was started, then adding each interval thereafter.

For a Timer object that only runs a callback once, after a given delay, see instead IO::Async::Timer::Countdown. A Countdown timer can also be used to create repeating events that fire at a fixed delay after the previous event has finished processing. See als the examples in IO::Async::Timer::Countdown.

EVENTS

The following events are invoked, either using subclass methods or CODE references in parameters:

on_tick

Invoked on each interval of the timer.

PARAMETERS

The following named parameters may be passed to new or configure:

on_tick => CODE

CODE reference for the on_tick event.

interval => NUM

The interval in seconds between invocations of the callback or method. Cannot be changed if the timer is running.

first_interval => NUM

Optional. If defined, the interval in seconds after calling the start method before the first invocation of the callback or method. Thereafter, the regular interval will be used. If not supplied, the first interval will be the same as the others.

Even if this value is zero, the first invocation will be made asynchronously, by the containing Loop object, and not synchronously by the start method itself.

Once constructed, the timer object will need to be added to the Loop before it will work. It will also need to be started by the start method.

AUTHOR

Paul Evans <leonerd@leonerd.org.uk>