BIND 10 #2931: Receiving notifications, python part

[BIND 10 Development]

#2931: Receiving notifications, python part
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                   Reporter:         |                 Owner:
  vorner                             |                Status:  new
                       Type:  task   |             Milestone:  New Tasks
                   Priority:         |              Keywords:
  medium                             |             Sensitive:  0
                  Component:         |           Sub-Project:  Core
  Inter-module communication         |  Estimated Difficulty:  0
               CVSS Scoring:         |           Total Hours:  0
            Defect Severity:  N/A    |
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 This is part of #1915.

 The goal here is to allow receiving notifications. The module session
 would get two new methods:
  * `registerNotificationCallback(notificationGroup, callback)` ‒ it would
 subscribe to a group `Notifications/<notificationGroup>` (if it wasn't
 subscribed already), store the callback to be called whenever a
 notification comes through that group and return some kind of ID of the
 callback.
  * `unregisterNotificationCallback(callbackID)` ‒ if passed the callback
 ID returned from the previous method, removes the callback and
 unsubscribes from relevant group, if there's no more callback for the
 group. After this, the callback would not be called any more.

 The callback would look like `callback(notificationName, params)`, as
 passed to the `createNotification` from ticket #2930.

 It should allow registering multiple callbacks for the same notification
 group, so libraries that live inside the same program don't accidentally
 fight over one if they both need the same notifications.

 The proposal is to modify the `checkCommand` method to recognize
 notifications and dispatch them similarly to how it calls commands.

-- 
Ticket URL: <http://bind10.isc.org/ticket/2931>
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