Ah, so you want your callback to have access to your object. Well, that's easy: yes, pass in the $self object: 
    $callback->($self);

[download]
This in itself isn't bad OO programming, and it doesn't defeat the purpose of OO. *However*, what if the callback then wants to access the cache? In your current scheme it would have to directly access 
    $self->{CACHE}

[download]
That's not good: you don't want some random callback function altering your object's attributes. So what you should do is, your class should provide some object methods to manipulate the cache. For example: 
    sub add_to_cache {
        my $self = shift;
        my $alias = shift;
        my @files = shift;
        push @{ $self->{CACHE}->{$alias} }, @files;
    }

[download]
To be used in a callback function like this: 
    $cache->add_to_cache(ALIAS, @files_in_dir);

[download]
Is this what you had in mind? You no longer have to muck around with your object's CACHE attribute.

Notice also that, instead of appending to a string, as you do, I'm pushing the directory name onto an array. This will get around your problem of filenames with spaces.

In reply to Re: Re: RE: RE: Scoping and Objects by btrott
in thread Scoping and Objects by radman

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.