Event::ExecFlow

Section: User Contributed Perl Documentation (3)
Updated: 2006-03-27
Index Return to Main Contents
 

NAME

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

NOTE

This is release has 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 same terms as Perl itself.


 

Index

NAME
NOTE
ABSTRACT
SYNOPSIS
DESCRIPTION
REQUIREMENTS
INSTALLATION
AUTHORS
COPYRIGHT AND LICENSE

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