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:  jinmei
  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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Comment (by jinmei):

 Replying to [comment:11 vorner]:

 > > A few more points:
 > > - maybe we shoud rename variables like 'zone' to 'zone_finder' (or if
 > >   it's too long something like 'zfinder')
 >
 > I tried to find them, but I must admit, it is hard without reading
 through all our code, which would take a long time. Could we just keep
 fixing the names as we go or live with this?

 Okay.

 I made a couple of trivial/minor fixes, with which I think this branch
 can be merged.

 One other thing I forgot to mention in the previous comment:
 {{{
     // TODO: Do we still need the PImpl if nobody should manipulate this
 class
     // directly any more (it should be handled through DataSourceClient)?
 }}}
 I guess pimpl will become less important for this class (but note that
 it's explicitly used in auth at the moment).  If avoiding pimpl
 improves readability, etc, I have no problem with making that change.

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Ticket URL: <http://bind10.isc.org/ticket/1060#comment:12>
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