Ilya Chukhnakov f0e1c206a9 Controller event handling pipeline ...

This patch introduces ControllerPipeline which is an entry point
handler for the Kuryr-Kubernetes controller. ControllerPipeline
allows registering ResourceEventHandlers and ensures the proper
handler is called for each event that is passed to the
ControllerPipeline. Also it ensures the following behavior:

- multiple ResourceEventHandlers can be registered for the same
  resource type (OBJECT_KIND)

- failing handlers (i.e. ones that raise Exceptions) are retried
  until either the handler succeeds or a finite amount of time
  passes, in which case the most recent exception is logged

- in case there are multiple handlers registered for the same
  resource type, all such handlers are considered independent (i.e.
  if one handler fails, other handlers will still be called
  regardless; and the order in which such handlers are called is not
  determined)

- events for different Kubernetes objects can be handled concurrently

- events for the same Kubernetes object are handled sequentially in
  the order of arrival

Change-Id: Ib17e0c7a2790cdbc31be4f59d50972b43c272480
Partially-Implements: blueprint kuryr-k8s-integration

2016-11-03 13:08:29 +00:00

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