Ah, I see.

So you could achieve what you want by putting a wrapper function around the return statements of the relevant methods in Audio::XMMSClient. 

  return $s->_process_handle($handle);

[download]
where _process_handle just returns its arg for async behaviour or does the sync-wait-and-return-data for the sync behaviour. You could select between the two either by subclassing (and overriding _process_handle), or even passing in sync => 0/1 to the ctor.

If that isn't palatable for some reason, this sounds a little bit like a job for that modern buzzword Aspect Oriented Programming. This isn't really my area of expertise, but as I understand it, it allows you to effectively install pre- or post- handlers into your existing codebase, selected by various criteria. Adding handlers to massage the return values of a given class sounds within it's remit.

I suspect that under the hood it is doing the same symbol table walking we've talked about before, but that should work OK in your case I think.

In reply to Re^5: Dynamically wrapping ancestor method calls by jbert
in thread Dynamically wrapping ancestor method calls by Limbic~Region

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