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From "Mihai Chira (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (FLEX-34119) mx.collections.HierarchicalCollectionViewCursor causes CursorError RTE from ListCollectionView when the underlying collections change
Date Thu, 21 Aug 2014 09:19:10 GMT

     [ https://issues.apache.org/jira/browse/FLEX-34119?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Mihai Chira resolved FLEX-34119.

    Resolution: Fixed

> mx.collections.HierarchicalCollectionViewCursor causes CursorError RTE from ListCollectionView
when the underlying collections change
> -------------------------------------------------------------------------------------------------------------------------------------
>                 Key: FLEX-34119
>                 URL: https://issues.apache.org/jira/browse/FLEX-34119
>             Project: Apache Flex
>          Issue Type: Bug
>          Components: Advanced Data Grid
>    Affects Versions: Apache Flex 4.12.1
>            Reporter: Mihai Chira
>            Assignee: Mihai Chira
>              Labels: collections, cursors, easytest
>             Fix For: Apache Flex 4.14.0
>         Attachments: BookmarkErrorScenarios.txt, _HierarchicalCollectionViewCursorBug.fxp
> *Steps to reproduce A*:
> # Run the unit test called HierarchicalCollectionViewCursor_FLEX_34119_Test in the "FLEX-34119"
branch against the HierarchicalCollectionViewCursor class in the develop branch. You should
see lots of "Bookmark no longer valid" errors.
> *Steps to reproduce B*:
> # Run the attached AIR project. (Avoid debug mode unless you want to press F8 MANY times).
It will take around 10s.
> The unit test (HierarchicalCollectionViewCursorTest.as) shows many of the ways in which
HierarchicalCollectionViewCursor's state can make ListCollectionView fail through a seek()
operation on ListCollectionViewCursor by allowing a CursorError to be thrown from ListCollectionView.getBookmarkIndex()
(I say 'allowing' because it could easily prevent it).
> The trace output (also attached to this ticket as BookmarkErrorScenarios.txt) shows all
the configurations of the collection view that I constructed which cause the RTE.
> *Notations in trace output*:
> * [SEL] - the currently selected item by the HierarchicalCollectionViewCursor (cursor.current).
> * [INS] - the newly inserted item, which caused the RTE
> * [REPL] - the item which, when replaced, causes the RTE (notice there's only one such
instance - when the (selected) second stage is replaced with another item).
> *NOTES*:
> * for us this has caused numerous, apparently mysterious bugs within AdvancedDataGrids
and Trees which boiled down to one or other of these configurations.
> * The reproduceCursorErrorWithDisableAutoUpdate() test shows that the error can also
be thrown by not allowing the HierarchicalCollectionView (and, implicitly, the HierarchicalCollectionViewCursor)
to know about changes in the underlying collections (by using disableAutoUpdate() in conjunction
with refresh() and enableAutoUpdate()). We were using these methods to optimise expensive
updates in the collections shown in the AdvancedDataGrids, without realising they had a knock-on
effect on the HierarchicalCollectionView used by the grids. This part of the error-generation
scenario is controlled by the programmers, of course, but it might be worth documenting, so
that others can avoid these issues.
> * FLEX-33054 reports a limited scenario of this bug too. When this is fixed, so should
> *The RTE that's usually thrown*:
> Main Thread (Suspended: Error: Bookmark no longer valid.)	
> 	mx.collections::HierarchicalCollectionViewCursor/collectionChangeHandler	
> 	flash.events::EventDispatcher/dispatchEventFunction [no source]	
> 	flash.events::EventDispatcher/dispatchEvent [no source]	
> 	mx.collections::HierarchicalCollectionView/nestedCollectionChangeHandler	
> 	flash.events::EventDispatcher/dispatchEventFunction [no source]	
> 	flash.events::EventDispatcher/dispatchEvent [no source]	
> 	mx.collections::ListCollectionView/dispatchEvent	
> 	mx.collections::ListCollectionView/addItemsToView	
> 	mx.collections::ListCollectionView/listChangeHandler	
> 	flash.events::EventDispatcher/dispatchEventFunction [no source]	
> 	flash.events::EventDispatcher/dispatchEvent [no source]	
> 	mx.collections::ArrayList/internalDispatchEvent	
> 	mx.collections::ArrayList/addItemAt	
> 	mx.collections::ListCollectionView/addItemAt

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