it's a good idea for it to avoid closing over $self.

[I didn't study the OP's code, so this may or may not be pertinent, but I think it is.]

When you have an object that calls a callback, it's a good idea to pass the object to the callback as an argument.

For example, say there's a class that calls a function periodically.

The following exhibits a circular reference:

my $timer;
$timer = Timer->new(
   callback => sub {
      ...
      if (...) {
         $timer->cancel;
      }
      ...
   },
   period => 5,
)
[download]

The following doesn't exhibit a circular reference:

my $timer = Timer->new(
   callback => sub {
      my ($timer) = @_;
      ...
      if (...) {
         $timer->cancel;
      }
      ...
   },
   period => 5,
)
[download]

The latter requires that Timer passes a reference to itself to the callback.

---

---

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! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

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:
	&		&
	<		&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.