BIND 10 #404: serialize RDATA for in memory data source

[BIND 10 Development]

#404: serialize RDATA for in memory data source
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      Reporter:  jinmei       |        Owner:  UnAssigned           
          Type:  task         |       Status:  reviewing            
      Priority:  major        |    Milestone:  y2 12 month milestone
     Component:  data source  |   Resolution:                       
      Keywords:               |    Sensitive:  0                    
Estimatedhours:  0.0          |        Hours:  0                    
      Billable:  1            |   Totalhours:  0                    
      Internal:  0            |  
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Changes (by jinmei):

  * owner:  jinmei => UnAssigned
  * status:  new => reviewing


Comment:

 branches/trac404 is ready for review.

 For this task I've extended the MessageRenderer class so that we can have
 different versions of it from an abstract base class.  For this particular
 purpose we could do it in a different way, but I'm pretty sure we'll
 eventually need another derived class for high performance authoritative
 server implementation.  So this should be considered an initial step
 toward that direction.  At this moment, not all existing users of this
 class have been modified to minimize changes.  This will be part of a next
 step task.

 The number of affected files is quite large as such, but most of them are
 trivial replacement due to the introduction of the abstract base class.
 The eseential part of this branch is rdatafields.h and rdatafields.cc in
 src/lib/dns and their tests.

 This is proposed changelog entry:
 {{{
   115.  [func]*         jinmei
         src/lib/dns: Introduced a new RdataFields class to represent RDATA
         in more efficient way.  This is intended to be used for
         performance improvement of b10-auth, and is not expected to be
         used by normal applications.  At this moment this class isn't used
         anywhere in the package yet.  This change also introduced an
         extension to the MessageRenderer class: it is now a derived base
         class of an abstract base class so that we can customize the
         rendering implementation in a polymorphic way.  It requires some
         trivial interface changes to the existing API.
         (Trac #404, svn rTBD)
 }}}

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Ticket URL: <http://bind10.isc.org/ticket/404#comment:1>
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