[jira] Updated: (TAPESTRY-2502) gridDataSource and possible 'race condition'

["Martijn Brinkers (JIRA)" <de...@tapestry.apache.org>]

     [ https://issues.apache.org/jira/browse/TAPESTRY-2502?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Martijn Brinkers updated TAPESTRY-2502:
---------------------------------------

    Summary: gridDataSource and possible 'race condition'  (was: ridDataSource and possible 'race condition')

> gridDataSource and possible 'race condition'
> --------------------------------------------
>
>                 Key: TAPESTRY-2502
>                 URL: https://issues.apache.org/jira/browse/TAPESTRY-2502
>             Project: Tapestry
>          Issue Type: Bug
>          Components: Core Components
>    Affects Versions: 5.0.13
>            Reporter: Martijn Brinkers
>
> GridDataSource requires you to return the number of rows from the
> getAvailableRows method. Later prepare gets called allowing you to get
> the records (or some of). Now if between the call to getAvailableRows
> and prepare some records are deleted you'll end up with less records
> then reported by getAvailableRows. Now what should be returned from
> getRowValue? I tried returning null but that was not allowed (like in
> exceptions occured). 
> What I would like is that when getRowValue returns
> null that the grid stops requesting more rows. This would also make it
> easier when you do not know how many rows you have in advance.

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