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Posted to dev@beehive.apache.org by "Alejandro Ramirez (JIRA)" <de...@beehive.apache.org> on 2005/08/24 18:43:26 UTC
[jira] Assigned: (BEEHIVE-814) Provide ability to track lifetime of PageFlow instances
[ http://issues.apache.org/jira/browse/BEEHIVE-814?page=all ]
Alejandro Ramirez reassigned BEEHIVE-814:
-----------------------------------------
Assign To: Julie Zhuo (was: Alejandro Ramirez)
verify
> Provide ability to track lifetime of PageFlow instances
> -------------------------------------------------------
>
> Key: BEEHIVE-814
> URL: http://issues.apache.org/jira/browse/BEEHIVE-814
> Project: Beehive
> Type: New Feature
> Components: NetUI
> Versions: TBD
> Environment: All
> Reporter: David Read
> Assignee: Julie Zhuo
> Priority: Minor
> Fix For: V1
>
> We've been looking at how to capture the lifetime of PageFlow instances through the EventReporter API. The original thinking was to generate create and destroy events that were correlated with an instance identifier for the PageFlow. Someone who wanted to analyze PageFlow usage could then "join" the create/destroy events to understand (1) how many of what type of PageFlow were created (over what period of time) and (2) how long PageFlows of each type existed.
> We originally looked at using system identity hash code to identify an instance (session id doesn't work since the same flow can exist more than once in a given session ... at the same time or over time). The problem with that approach is when clustering is involved. If the destroy event happened on a "secondary" server, the (calculated) correlation value would be different.
> Two other approaches come to mind ... but there could be others ...
> (1) capture the create time as a non-transient attribute of the flow and expose that via a public API. That would allow the event reporter to ignore the create event (WRT lifetime), and just capture the destroy event. While this does add to memory and serialization cost, the benefit is that it is fairly small and is fixed.
> (2) capture an identity as a non-transient attribute of the flow and expose that via a public API. This may be a more useful concept, but might have a larger (or more variable) impact on performance.
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