NAME
   Parallel::Workers - run worker tasks in parallel. Worker task is a
   plugin that you can implement. The availables are Eval for CODE, SSH and
   XMLRPC.

VERSION
   This document describes Parallel::Workers version *$VERSION*

SYNOPSIS
       use Parallel::Workers;

       #Workers that use Eval action with a trantransaction controller
       #                 ^^^^

       my $worker=Parallel::Workers->new(maxworkers=>4,timeout=>10, backend=>"Eval");

       my $id=$worker->create(hosts => \@named, command=>"`date`",
                              transaction=>{error=>TRANSACTION_TERM, type=>'SCALAR',regex => qr/.+/m});
       my $info=$worker->info();

       #Workers that use SSH action with a trantransaction controller
       #                 ^^^
       $worker=Parallel::Workers->new(
                                       maxworkers=>16,timeout=>10,
                                       backend=>"SSH", constructor =>{user=>'demo',pass=>'demo'}
                                     );

       $id=$worker->create(hosts => \@hosts, command=>"cat /proc/cmdline",
                                         transaction=>{error=>TRANSACTION_TERM, type=>'SCALAR',regex => qr/.+/m});

DESCRIPTION
   This *Parallel::Workers* allow you to run multiples tasks in parallel
   with or without error check (see *Parallel::Workers::Transaction*).

   You can specify maxworkers value that limit the max parallel task
   (threads pool). You can specify the backend that run the task, currently
   only Eval, SSH and XMLRPC are implemented, but you can make yours for
   your needs.

   Workers run simples tasks that return value. You can specify different
   way to check the return value and on error you decide to stop or
   continue the main workers (see *Parallel::Workers::Transaction*).

           # workers TERM if return value is not in this regex /.+/m
           $id=$worker->create(...,
                               transaction=>{error=>TRANSACTION_TERM, type=>'SCALAR',regex => qr/.+/m };

           # workers TERM if return value is not 127
           $id=$worker->create(...,
                               transaction=>{error=>TRANSACTION_TERM, type=>'SCALAR',check => 127};

           # workers TERM if return value is not an HASH
           $id=$worker->create(...,
                               transaction=>{error=>TRANSACTION_TERM, type=>'ARRAY'};

           # workers CONTINUE on error
           $id=$worker->create(...,
                               transaction=>{error=>TRANSACTION_CONT, ...};

METHODS
 new([%h])
   Constructor. %h is a hash of attributes :

       maxworkers:16 , the max parallel tasks (threads)
       timeout:10, the time in second before to kill thread (only when stop workers)
       backend:undef, the task
       constructor:undef, the task constructor

 info()
     return all workers results

 create(hosts => @hosts, spawn=>0, command=>$cmd, params=>%h|@a|$r, transaction=>%h)
 stop
 clear
 join
DIAGNOSTICS
   "Error message here, perhaps with %s placeholders"
       [Description of error here]

   "Another error message here"
       [Description of error here]

       [Et cetera, et cetera]

CONFIGURATION AND ENVIRONMENT
   Parallel::Workers requires no configuration files or environment
   variables.

DEPENDENCIES
   None.

INCOMPATIBILITIES
   None reported.

BUGS AND LIMITATIONS
   No bugs have been reported.

   Please report any bugs or feature requests to
   "[email protected]", or through the web interface at
   <http://rt.cpan.org>.

AUTHOR
   Olivier Evalet "<[email protected]>"

LICENCE AND COPYRIGHT
   Copyright (c) 2006, Olivier Evalet "<[email protected]>". All rights
   reserved.

   This module is free software; you can redistribute it and/or modify it
   under the same terms as Perl itself. See perlartistic.

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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