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Call asynchronous APIs synchronously

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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:

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.

IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE SOFTWARE AS PERMITTED BY THE ABOVE LICENCE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE SOFTWARE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

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