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https://issues.apache.org/jira/browse/WICKET-1766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12619820#action_12619820
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Rik van der Kleij commented on WICKET-1766:
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Yes, I see the problem but I don't understand the solution. Consider the
situation that during isVisible(return getRowCount()>0) 1 item exists. After
that the only one is removed before rendering. So the table is visible but
contains no item.
To mine opinion it is better to have a consistent state than a ambiguous state
during one request. Cache one time for a request. Data can always change so you
have to take a snapshot in time.
> Method size() of a data provider is invoked twice.
> --------------------------------------------------
>
> Key: WICKET-1766
> URL: https://issues.apache.org/jira/browse/WICKET-1766
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 1.3.4
> Environment: Ubuntu
> Reporter: Rik van der Kleij
> Assignee: Igor Vaynberg
> Priority: Minor
>
> Method size() of a data provider is invoked twice during one request. This
> happens when navigating to a next or latest page in a data table. During
> debugging I noticed that the onDetach() of AbstractPageableView is invoked an
> extra time. Implementations of size() normally query the database so it will
> slow down the performance.
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