NAME
    Event::ExecFlow - High level API for event-based execution flow control

NOTE
    This is a first CPAN release with nearly no documentation yet. If you're
    interested in the details please contact the author.

ABSTRACT
    Event::ExecFlow provides a ligh level API for defining complex flow
    controls with asynchronous execution of external programs.

SYNOPSIS
      use Event::ExecFlow;

      my $job = Event::ExecFlow::Job::Group->new (
        jobs => [
          Event::ExecFlow::Job::Command->new (
            name            => "transcode",
            title           => "Transcoding DVD title to OGG",
            command         => "transcode -i /dev/dvd ...",
            fetch_output    => 1,
            progress_max    => 4711, # number of frames
            progress_parser => sub {
              my ($job, $buffer) = @_;
              $job->set_progress_cnt($1) if $buffer =~ /\[\d+-(\d+)\]/;
              #-- or simply write this:
              #--   progress_parser => qr/\[\d+-(\d+)\]/,
            },
          ),
          Event::ExecFlow::Job::Code->new (
            name          => "checks",
            title         => "Do some checks",
            depends_on    => [ "transcode" ],
            code          => sub {
              my ($job) = @_;
              my $transcode = $job->get_group->get_job_by_name("transcode");
              if ( $transcode->get_output !~ /.../ ) {
                $job->set_error_message("XY check failed");
              }
              #-- this could be done easier as a post_callback added to
              #-- the "transcode" job above, but it's nevertheless a good
              #-- example for the 'Code' job type and shows how jobs can
              #-- interfere with each other.
            },
          ),
          Event::ExecFlow::Job::Command->new (
            title         => "Muxing OGG file",
            depends_on    => [ "checks" ],
            command       => "ogmmerge ...",
            no_progress   => 1,
          ),
        ],
      );

      #-- this inherits from Event::ExecFlow::Frontend
      my $frontend = Video::DVDRip::GUI::ExecFlow->new(...);
      $frontend->start_job($job);
  
DESCRIPTION
    Event::ExecFlow offers a high level API to declare jobs, which mainly
    execute external commands, parse their output to get progress or other
    status information, triggers actions when the command has been finished
    etc. Such jobs can be chained together in a recursive fashion to fulfill
    rather complex tasks which consist of many jobs.

    Additionally it defines an extensible API for communication with the
    frontend application, which may be a written using Gtk2, Tk or Qt or is
    a simple text console program.

    In case of Gtk2 a custom widget for displaying an Event::ExecFlow job
    plan, including progress updates, is shipped with the
    Gtk2::Ex::FormFactory package.

REQUIREMENTS
    Event::ExecFlow requires the follwing Perl modules:

      AnyEvent           >= 0.04
      Locale::TextDomain
      Test::More

INSTALLATION
    You get the latest installation tarballs and online documentation at
    this location:

      http://www.exit1.org/Event-ExecFlow/

    If your system meets the requirements mentioned above, installation is
    just:

      perl Makefile.PL
      make test
      make install

AUTHORS
      Jörn Reder <joern at zyn dot de>

COPYRIGHT AND LICENSE
    Copyright 2005-2006 by Jörn Reder.

    This library is free software; you can redistribute it and/or modify it
    under the terms of the GNU Library General Public License as published
    by the Free Software Foundation; either version 2.1 of the License, or
    (at your option) any later version.

    This library is distributed in the hope that it will be useful, but
    WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library
    General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307
    USA.