Robert Boone > Dispatch-Declare-0.1.2 > Dispatch::Declare

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Module Version: 0.1.2   Source  

NAME ^

Dispatch::Declare - Build a hash based dispatch table declaratively

VERSION ^

This document describes Dispatch::Declare version 0.1.1

SYNOPSIS ^

    use Dispatch::Declare;

    my $action = 'ADDUSER';

    declare REPAIRDB => sub {
        print 'This is a REPAIRDB test' . "\n";
    };

    declare ADDUSER => sub {
        print 'This is a ADDUSER test' . "\n";
    };

    run $action;

DESCRIPTION ^

Large if-else statement can be trouble or as the PBP calls them cascading ifs. I also find that large hash/dispatch tables can lead to trouble too. If you make a syntax error the line given could be at the end of the control structure. I thought most of the problems could be solved with a little syntax.

INTERFACE ^

    There are only two subroutines exported, declare and run.
    declare is where you setup you dispatch table.
declare
    declare KEY1 => sub {
        ...
    };
    
    declare KEY2 => sub {
        ...
    };
declare_once
    Only allow a key to be set once.

    declare_once KEY1 => sub { # Set KEY1
        ...
    };
    
    declare KEY1 => sub { # Error
        ...
    };
    
    declare KEY1 => sub { # Error
        ...
    };
undeclare
   undeclare 'KEY1';

   Now KEY1 has been remove from the table.
run
    Then to call your action:
    my $key = 'KEY1';
    run $key, @args;
    
    That all there is to it.
DEFAULT key If you make one of your keys DEFAULT it will be executed if no other keys match.
    declare DEFAULT => sub {
        ...
    };

    run; # runs DEFAULT action

GIT REPOSITORY ^

http://www.rlb3.com/Dispatch-Declare.git http://www.rlb3.com/cgi-bin/gitweb.cgi?p=Dispatch-Declare.git;a=summary

CONFIGURATION AND ENVIRONMENT ^

Dispatch::Declare requires no configuration files or environment variables.

INCOMPATIBILITIES ^

None reported.

BUGS AND LIMITATIONS ^

1. The value part of the declare must be a code ref. 2. Only one dispatch table can be used.

No bugs have been reported.

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

AUTHOR ^

Robert Boone <rlb@cpan.org>

LICENCE AND COPYRIGHT ^

Copyright (c) 2007, Robert Boone <rlb@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.

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