/ 
DataFlow-0.91.02
River stage one • 8 direct dependents • 8 total dependents
/ DataFlow::Chain

NAME

DataFlow::Chain - A "super-node" that can link a sequence of nodes

VERSION

version 0.91.02

SYNOPSIS

use DataFlow::Node;
use DataFlow::Chain;

my $chain = DataFlow::Chain->new(
    links => [
        DataFlow::Node->new(
            process_item => sub {
                shift; return uc(shift);
            }
        ),
        DataFlow::Node->new(
            process_item => sub {
                shift; return reverse shift ;
            }
        ),
    ],
);

my $result = $chain->process( 'abc' );
# $result == 'CBA'

DESCRIPTION

This is a Moose based class that provides the idea of a chain of steps in a data-flow. One might think of it as the actual definition of the data flow, but this is a limited, linear, flow, and there is room for a lot of improvements.

A DataFlow::Chain object accepts input like a regular DataFlow::Node, but it injects that input into the first link of the chain, and pumps the output of each link into the input of the next one, similarly to pipes in a shell command line. The output of the last link of the chain will be used as the output of the entire chain.

ATTRIBUTES

This attribute is a ArrayRef[DataFlow::Node], and it holds the actual "chain" of nodes to process the data.

METHODS

The interface for DataFlow::Chain is the same of DataFlow::Node, except for the accessor method for links.

DEPENDENCIES

DataFlow::Node

List::Util

INCOMPATIBILITIES

None reported.

BUGS AND LIMITATIONS

Please report any bugs or feature requests to bug-dataflow@rt.cpan.org, or through the web interface at http://rt.cpan.org.

AUTHOR

Alexei Znamensky <russoz@cpan.org>

LICENCE AND COPYRIGHT

Copyright (c) 2010, Alexei Znamensky <russoz@cpan.org>. 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.