BIND 10 #1060: introduce the abstract DataSourceClient and ZoneHandle classes

[BIND 10 Development]

#1060: introduce the abstract DataSourceClient and ZoneHandle classes
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                   Reporter:         |                 Owner:  UnAssigned
  jinmei                             |                Status:  reviewing
                       Type:  task   |             Milestone:
                   Priority:  major  |  Sprint-20110802
                  Component:  data   |            Resolution:
  source                             |             Sensitive:  0
                   Keywords:         |           Sub-Project:  DNS
            Defect Severity:  N/A    |  Estimated Difficulty:  5.0
Feature Depending on Ticket:         |           Total Hours:  0
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Changes (by vorner):

 * owner:  vorner => UnAssigned
 * status:  accepted => reviewing


Comment:

 I think it should be ready for review. The in-memory data source is
 inherited from it, with some renaming, etc.

 However, the DataSourceClient class is not complete, I didn't add any of
 the functions allowing modifications or iterating trough the whole zone. I
 think these can be added when they are needed (either when they are used
 or when some backend would like to implement it), as I wouldn't guess the
 interface right anyway.

 I hope I understand the general direction of refactoring correctly. If
 not, please point it out.

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Ticket URL: <http://bind10.isc.org/ticket/1060#comment:7>
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