BIND 10 #1332: Implement ZoneJournalReader class

[BIND 10 Development]

#1332: Implement ZoneJournalReader class
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                   Reporter:         |                 Owner:  UnAssigned
  jinmei                             |                Status:  reviewing
                       Type:  task   |             Milestone:
                   Priority:  major  |  Sprint-20111122
                  Component:  data   |            Resolution:
  source                             |             Sensitive:  0
                   Keywords:         |           Sub-Project:  DNS
            Defect Severity:  N/A    |  Estimated Difficulty:  5
Feature Depending on Ticket:         |           Total Hours:  0
        Add Hours to Ticket:         |
                  Internal?:  0      |
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Comment (by jinmei):

 Forgot to mention one thing: I think we should also implement
 buffering of retrieved diffs to minimize the duration of possible
 database lock quite soon.  But since the branch is getting large
 and it's not crucial for the initial implementation of IXFR-out,
 I chose not to do it within this ticket.

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Ticket URL: <http://bind10.isc.org/ticket/1332#comment:8>
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