NAME

DataFlow::ProcWrapper - Wrapper around a processor

VERSION

version 1.121830

SYNOPSIS

    use DataFlow::ProcWrapper;
    use DataFlow::Item;

	my $wrapper = DataFlow::ProcWrapper->new( wraps => sub { lc } );
	my $item = DataFlow::Item->itemize( 'default', 'WAKAWAKAWAKA' );
	my @result = $wrapper->process($item);
	# $result[0]->get_data('default') equals to 'wakawakawaka'

DESCRIPTION

This class DataFlow::ProcWrapper consumes the DataFlow::Role::Processor role, but this is not a "common" processor and it should not be used as such. Actually, it is supposed to be used internally by DataFlow alone, so in theory, if not in practice, we should be able to ignore its existence.

ProcWrapper will, as the name suggests, wraps around a processor (read a Proc, a DataFlow, a naked sub or a named processor), and provides a layer of control on the input and output channels.

ATTRIBUTES

input_chan

Name of the input channel. The DataFlow::Item may carry data in distinct "channels", and here we can select which channel we will take the data from. If not specified, it will default to the literal string 'default'.

output_chan

Similarly, the output channel's name. If not specified, it will default to the same channel used for input.

METHODS

process

This works like the regular process() method in a processor, except that it expects to receive an object of the type DataFlow::Item.

Additionaly, one can pass a random scalar as argument, and add a second argument that evaluates to a true value, and the scalar argument will be automagically "boxed" into a DataFlow::Item object.

Once the data is within a DataFlow::Item, data will be pulled from the specified channel, will call the wrapped processor's process() method.

It will always return an array with one or more elements, all of them of the DataFlow::Item type.

SEE ALSO

Please see those modules/websites for more information related to this module.

AUTHOR

Alexei Znamensky <russoz@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2011 by Alexei Znamensky.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

BUGS AND LIMITATIONS

You can make new bug reports, and view existing ones, through the web interface at http://rt.cpan.org.

DISCLAIMER OF WARRANTY

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