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Re: Creating a "Plug-In" Framework for a Module

by g0n (Priest)
on Jan 30, 2006 at 14:49 UTC ( #526457=note: print w/replies, xml ) Need Help??


in reply to Creating a "Plug-In" Framework for a Module

One method I've used for handling plugins (thanks to the guidance of various monks in the CB) is a delegation class - something like this:

package Toolkit::DB; ############################################# # new - constructor # # # returns blessed db object ############################################# sub new { my $self = shift; my %params = @_; if (!$params{dbtype}) { $params{dbtype} = "Toolkit::FileDB"; } $params{delegate} = "$params{dbtype}"->new(%params); return bless \%params,$self; } ############################################# # insert - add a record to the db # # takes hash of fieldname/fieldcontent # # returns success/fail ############################################# sub insert { my $self = shift; my %data = @_; my $result = $self->{delegate}->insert(%data); return $result; }

(With similar methods for all the other function calls needed). Then at run time you can choose which implementation class to use, or take the default ('Toolkit::FileDB' in this instance).

Update: It's just occurred to me - that way you could also create stubs for the functionality that return 'this function is not available without X::Y::Z installed' instead of a fatal error.

Update: There's some possibly related discussion about using use and require in Use and Require - making an informed choice.

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