I think you may have misread the source code of Client2. The variables $cmd, @args are not input parameters to get_message() but rather just local variable declarations: 

sub get_message {
    my $self = shift;
    my($cmd, @args);
...

[download]

That doesn't negate your method, but does require you to modify the dispatching to check your dispatch table before dispatching any non-overridden methods to the superclass at the bottom of the read loop rather than at the top of the sub.

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In the absence of evidence, opinion is indistinguishable from prejudice.
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In reply to Re^2: Subclassing a class that uses an internal dispatch table by BrowserUk
in thread Subclassing a class that uses an internal dispatch table by BrowserUk

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