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https://issues.apache.org/jira/browse/WICKET-2064?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12669202#action_12669202
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Igor Vaynberg commented on WICKET-2064:
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the key is metadata because it is only used during rendering and then discarded
in ondetach. if you make it a field then it will be serialized for every
component to disk and held in memory which is wasteful. so the question is what
is more overhead: memory hit+disk space hit vs runtime overhead of managing
metadata entry.
> Make Component.ENABLED_IN_HIERARCHY_CACHE_KEY a instance variable rather than
> a MetaDataKey
> -------------------------------------------------------------------------------------------
>
> Key: WICKET-2064
> URL: https://issues.apache.org/jira/browse/WICKET-2064
> Project: Wicket
> Issue Type: Improvement
> Components: wicket
> Affects Versions: 1.4-RC1
> Reporter: Juergen Donnerstag
> Priority: Minor
>
> Component.ENABLED_IN_HIERARCHY_CACHE_KEY currently is a MetaDataKey which get
> added to each Component if isEnableInHierarchy is invoked. That basically
> happens all the time. In contrast the concept of MetaData has been introduced
> to allow rarely used data to be attached to Components (with java 1.5 in a
> typesafe manner). Since MetaData introduce some overhead, and for simplicity
> reasons, I'd suggest to convert Component.ENABLED_IN_HIERARCHY_CACHE_KEY into
> a Boolean instance variable.
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