BIND 10 #3059: Create initial UpdateMgr class

[BIND 10 Development]

#3059: Create initial UpdateMgr class
-------------------------------------+-------------------------------------
                   Reporter:  tmark  |                 Owner:
                       Type:         |                Status:  new
  enhancement                        |             Milestone:  Sprint-
                   Priority:         |  DHCP-20130717
  medium                             |              Keywords:
                  Component:  dhcp-  |             Sensitive:  0
  ddns                               |           Sub-Project:  DNS
               CVSS Scoring:         |  Estimated Difficulty:  0
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 Task #6.2 from the task spread sheet. Develop the class structure and
 basic event processing loop as described in the DHCP-DDNS design,
 discussed in the "D2 Event Processing" section.

 The initial implementation should assume/support single-threaded operation
 (as excerpted from the design doc):

 {{{
 while (!shutdown) {

         // Execute all ready callbacks, or wait for one
         if (io_service.poll() || io_service.run_one()) {

             // One or more of the following has occurred
             //   a. NCR message received and has been queued
             //   b. Pending DNS IO has completed
             //   c. Interval timer expired

             if (QueueMgr->queueNotEmpty()) {
                 // Dequeue next pending request
                 NCR = QueueMgr->dequeue();

                 // Start a new transaction for the NCR
                 instantiate_transaction(io_service, NCR);
             }

             handle_finished_transactions();

         } else {

             // we are here because there is no more work to do
             // somebody stopped io_service, shutdown request likely
 culprit

         }
     }
 }}}

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Ticket URL: <http://bind10.isc.org/ticket/3059>
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BIND 10 Development