NAME
AnyEvent::Capture - Call asynchronous APIs synchronously
VERSION
version 0.1.1
SYNOPSIS
use AnyEvent::Capture;
use AnyEvent::Socket qw( inet_aton );
# Call the async version of inet_aton in a synchronous fashion, but
# while we're doing this other events will fire.
my @ips = capture { inet_aton( 'localhost', shift ) };
# An example of waiting for a child without blocking events from firing
# while we wait.
sub wait_for_child($) {
my( $pid ) = @_;
my($rpid,$rstatus) = capture { AnyEvent->child(pid=>$pid, cb=>shift) };
return $rstatus;
}DESCRIPTION
Simple sugar to allow you to call an event based API in a blocking fashion. Other events will of course continue to fire while you're waiting.
The first argument passed to your block will be the event listener you should use as your callback. The capture call will return when that subroutine is called.
Any return result from your block will be stored until the callback is triggered. This way guard objects returned from AnyEvent won't immediate expire the listener.
HELPERS
sub capture( CodeRef $todo ) returns Any
Executes $todo, passing it a CodeRef to be used as an event listener. After $todo returns, it enters the event loop and waits till the CodeRef is called. The return value of $todo will be stored until such time as the CodeRef is called. It then returns the arguments that were passed to the CodeRef.
In so doing, it allows you to call an asychronous function in a synchronous fashion.
This module is similar to Data::Monad::CondVar but much simpler. You could write the example using Data::Monad::CondVar this way:
my @ips = (as_cv {inet_aton( 'localhost', shift ) })->recv;SEE ALSO
SOURCE
The development version is on github at http://https://github.com/iarna/AnyEvent-Capture and may be cloned from git://https://github.com/iarna/AnyEvent-Capture.git
SUPPORT
Websites
More information can be found at:
MetaCPAN
A modern, open-source CPAN search engine, useful to view POD in HTML format.
Bugs / Feature Requests
Please report any bugs at https://github.com/iarna/AnyEvent-Capture/issues.
AUTHOR
Rebecca Turner <becca@referencethis.com>
COPYRIGHT AND LICENSE
This software is copyright (c) 2012 by Rebecca Turner.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
DISCLAIMER OF WARRANTY
BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH YOU. SHOULD THE SOFTWARE PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR, OR CORRECTION.
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