BIND 10 #541: revisit the Zone::find() interface

[BIND 10 Development]

#541: revisit the Zone::find() interface
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           Reporter:  jinmei         |                      Owner:
               Type:  enhancement    |                     Status:  new
           Priority:  major          |                  Milestone:  A-Team-
          Component:  data source    |  Task-Backlog
          Sensitive:  0              |                   Keywords:
Add Hours to Ticket:  0              |  Estimated Number of Hours:  0
        Total Hours:  0              |                  Billable?:  1
                                     |                  Internal?:  0
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 See the discussion at bind10-dev starting from
 https://lists.isc.org/pipermail/bind10-dev/2011-January/001918.html

 I'd specifically propose
  - not use a parameter to exchange "all RRsets" of the found node (when
 found)
  - introduce a notion of "domain", and have Zone::find() return it with
    the best-match RRset
  - introduce a set of operation on domains, including iteration/retrieval
    of all/specific RRsets of the domain
  - for type ANY find(), return any first match RRset (and have the caller
    retrieve necessary RRsets using the options for the domain

 This doesn't have to be done right now, but (if we agree on the basic
 idea) I'd like to make it happen before we support DNSSEC with the
 in-memory data source or we generalize/unify the data source interface
 for all types of data sources.

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Ticket URL: <http://bind10.isc.org/ticket/541>
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BIND 10 Development