Ken Giusti created QPID-4756:
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Summary: Python QMF console: QMFv2 object statistic notifications
not working.
Key: QPID-4756
URL: https://issues.apache.org/jira/browse/QPID-4756
Project: Qpid
Issue Type: Improvement
Components: Qpid Managment Framework
Affects Versions: 0.22
Reporter: Ken Giusti
Assignee: Ken Giusti
Priority: Minor
Fix For: 0.23
The QMF python console module provides a Console interface class that provides
callbacks for QMF-related asynchronous events. This class can be used to
receive notifications when managed objects are updated. These notifications
come when an object's Statistics or Properties change.
The first version of QMF (QMFv1) provided separate notification messages for
Statistics and Properties changes. Thus, the Console class provides two
callback interfaces - one for Statistics updates (objectStats), and a separate
one for Property changes (objectProps).
The current version of QMF (QMFv2) was designed to consolidate the separate
notification messages into a single message containing both properties and
statistics.
However, the dual callback interface has not changed to reflect the QMFv2
behavior.
Currently, when a QMFv2 update notification arrives, the Console's objectProps
method is invoked, passing the updated information. However, this information
can contain both statistics and properties. This is awkward at best, because
existing applications would have to distinguish between QMFv1 updates and QMFv2
updates, and handle them differently (eg. objectProps handler would have check
for updated statistics in the case of QMFv2 objects, but not for QMFv1 objects).
This patch introduces a new callback method to the Console object:
objectUpdate( broker, object )
this method is invoked only for QMFv2 object updates. The object passed may
contain both statistics and property values.
This patch changes the behavior of the existing callback code to only pass
QMFv1 object updates to the old objectStats/objectProps interfaces. QMFv1
updates are -not- passed to objectUpdate(), only QMFv2 updates are.
The intent is to deprecate the objectStats/objectProps interfaces when QMFv1 is
deprecated, and support objectUpdate() going forward.
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