BIND 10 #554: Abstract UDPQuery to IOFetch which will be transport layer agnostic

[BIND 10 Development]

#554: Abstract UDPQuery to IOFetch which will be transport layer agnostic
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           Reporter:  smann          |                      Owner:  smann
               Type:  enhancement    |                     Status:  new
           Priority:  major          |                  Milestone:  R-Team-
          Component:  resolver       |  Sprint-20110208
          Sensitive:  0              |                   Keywords:
Add Hours to Ticket:  0              |  UDPQuery fetch udp tcp
        Total Hours:  0              |  Estimated Number of Hours:  8
                                     |                  Billable?:  1
                                     |                  Internal?:  0
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 This is a prerequisite for ticket #499, which seeks to add the ability to
 handle truncated UDP responses via TCP. Currently, UDPQuery is very
 tightly coupled with UDP. This task shall make UDPQuery able to handle
 either UDP or TCP. It shall also change the name to IOFetch since that
 name 1) is more reflective of it fetching an answer on behalf of a client
 and 2) disassociating with UDP specifically.

 As a side note, this is an intermediate step to fully abstracting the
 transport layer via the use of IOSocket, which should be completed as soon
 as practical.

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Ticket URL: <http://bind10.isc.org/ticket/554>
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BIND 10 Development