BIND 10 #2205: introduce a "data source configurator" thread in auth

[BIND 10 Development]

#2205: introduce a "data source configurator" thread in auth
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                   Reporter:         |                 Owner:
  jinmei                             |                Status:  new
                       Type:  task   |             Milestone:  Next-Sprint-
                   Priority:         |  Proposed
  medium                             |            Resolution:
                  Component:         |             Sensitive:  0
  b10-auth                           |           Sub-Project:  DNS
                   Keywords:         |  Estimated Difficulty:  0
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
  background zone loading            |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by jinmei):

 Replying to [comment:2 vorner]:
 > Maybe it's a bit of haskellism on my side, but whenever I do something
 like this, the easiest (and most generic) approach is creating a work
 thread with a queue of functions (or functors) ‒ something like a wrapper
 around a thread, conditional variable and `vector<boost::function<void()>
 >`.
 >
 > It is simple, generic and the code that needs to be backgrounded (like
 the loading we plan) doesn't have to be split across multiple places ‒ the
 code that needs something done in the background contains the functor as
 well.

 I'm not sure if I fully understand above.  Can you provide some
 sample code snippet to illustrate the idea more specifically?

 In any case, specific ways to implement it is up to the developer
 (and the reviewer, and if it's controversial on review we can discuss
 it project wide).  The approach mentioned in the description is just
 an example to give a better idea of what should be done, and doesn't
 have to be adopted literally.

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Ticket URL: <http://bind10.isc.org/ticket/2205#comment:4>
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