IO::Async::Future

Section: User Contributed Perl Documentation (3pm)
Updated: 2018-04-19
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NAME

"IO::Async::Future" - use Future with IO::Async

SYNOPSIS

 use IO::Async::Loop;

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

 my $future = $loop->new_future;

 $loop->watch_time( after => 3, code => sub { $future->done( "Done" ) } );

 print $future->get, "\n";

DESCRIPTION

This subclass of Future stores a reference to the IO::Async::Loop instance that created it, allowing the "await" method to block until the Future is ready. These objects should not be constructed directly; instead the "new_future" method on the containing Loop should be used.

For a full description on how to use Futures, see the Future documentation.

CONSTRUCTORS

New "IO::Async::Future" objects should be constructed by using the following methods on the "Loop". For more detail see the IO::Async::Loop documentation.

   $future = $loop->new_future

Returns a new pending Future.

   $future = $loop->delay_future( %args )

Returns a new Future that will become done at a given time.

   $future = $loop->timeout_future( %args )

Returns a new Future that will become failed at a given time.

METHODS

loop

   $loop = $future->loop

Returns the underlying IO::Async::Loop object.

done_later

   $future->done_later( @result )

A shortcut to calling the "done" method in a "later" idle watch on the underlying Loop object. Ensures that a returned Future object is not ready immediately, but will wait for the next IO round.

Like "done", returns $future itself to allow easy chaining.

fail_later

   $future->fail_later( $exception, @details )

A shortcut to calling the "fail" method in a "later" idle watch on the underlying Loop object. Ensures that a returned Future object is not ready immediately, but will wait for the next IO round.

Like "fail", returns $future itself to allow easy chaining.

AUTHOR

Paul Evans <leonerd@leonerd.org.uk>