You aren't showing how the callbacks are called. If they are called as methods (i.e.: 
$method = $self->{server}->getcallback("data");
$self->$method();

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), you can just look up a coderef by method name for an object using can:
...setcallback(
   data => $self->can("gotdata"),
   connect => $self->can("connected"),
   disconnect => $self->can("disconnect")
)

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If a method isn't available for an object, can will return undef.

If the callbacks are expected to remember what object they belong (i.e. they are called like &{...getcallback("data")}()), use an anonymous sub: 

...setcallback(
   data => sub { $obj->gotdata },
   ...

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In reply to Re: coderef to an object method by ysth
in thread coderef to an object method by genecutl

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