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 module provides a subclass of IO::Async::Timer for implementing repeating events at regular intervals. The object invokes its callback 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.

This object may be used in one of two ways; with a callback function, or as a base class.

Callbacks

If the on_tick key is supplied to the constructor, it should contain a CODE reference to a callback function to be invoked at the appropriate time:

 $on_tick->( $self )

Base Class

If a subclass is built, then it can override the on_tick method.

 $self->on_tick()

PARAMETERS

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

on_tick => CODE

CODE reference to callback to invoke each interval. If not supplied, the subclass method will be called instead.

interval => NUM

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

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>