Data::Stream::Bulk::DoneFlag - Implement the is_done method in terms of a flag

    package Data::Stream::Bulk::Blah;
    use Moose;

    with qw(Data::Stream::Bulk::DoneFlag);

    sub get_more {
        if ( my @more = more() ) {
            return \@more;
        } else {
            return;
        }
    }

This role implements the Data::Stream::Bulk core API in terms of one method (get_more).

As a convenience it calls finished when the stream is exhausted, so that cleanup may be done.

This is used by classes like Data::Stream::Bulk::DBI, Data::Stream::Bulk::Callback.

Returns the state of the iterator.

As long as the iterator is not yet done, calls get_more.

If get_more returned a false value instead of an array reference then done is set, finished is called, and this next does nothing on subsequent calls.

A noop by default. Can be overridden if so desired.

Returns the next block of data as an array ref, or a false value if no items are left.

Yuval Kogman <nothingmuch@woobling.org>

This software is copyright (c) 2010 by Yuval Kogman.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.