Pageable Views call IDataProvider.size() more than once
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Key: WICKET-2532
URL: https://issues.apache.org/jira/browse/WICKET-2532
Project: Wicket
Issue Type: Bug
Components: wicket
Affects Versions: 1.4.1
Environment: All
Reporter: bernard
IDataProvider.size() is typically an expensive database operation. It is called
twice in typical Pageable View scenarios although Wicket makes attempts to
avoid that. In addition, the first call is premature from the application
perspective because it is made while the the requested page position is not yet
known.
How to reproduce:
Drop in the attached files into the Wicket examples application and run:
repeaters|Paging DataView Example - builds on previous to demonstrate paging
and page navigation
Otherwise I am running against a wall with IDataProvider.size() and
AbstractPageableVew because I can't find any way to get the page position at
the same time when IDataProvider.size() is called. Support of paging of results
of unknows size is impossible without this information. Please refer to Google
search results paging - that is the kind of paging we need.
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