NAME
    Net::DNS::Callback - Asynchronous DNS Helper

SYNOPSIS
            use Net::DNS::Callback;

            my $c = new Net::DNS::Callback(QueueSize => 20);

            for (...) {
                    $c->add(\&callback, @query);
            }
            $c->done();

            sub callback {
                    my $response = shift;
                    ...
            }

CONSTRUCTOR
    The class method new(...) constructs a new helper object. All arguments
    are optional. The following parameters are recognised as arguments to
    new():

    QueueSize
        The size of the query queue. If this is exceeded, further calls to
        add() will block until some responses are received or time out.

    Timeout
        The timeout for an individual query.

METHODS
    $c->add($callback, @query)
        Adds a new query for asynchronous handling. The @query arguments are
        those to Net::DNS::Resolver->bgsend(), q.v. This call will block
        until the queue is less than QueueSize.

    $c->done()
        Flushes the queue, that is, waits for and handles all remaining
        responses.

BUGS
    UDP retries are not yet implemented.

SEE ALSO
    Net::DNS

COPYRIGHT
    Copyright (c) 2005-2006 Shevek. All rights reserved.

    This program is free software; you can redistribute it and/or modify it
    under the same terms as Perl itself.