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https://issues.apache.org/jira/browse/FLEX-34765?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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shane doolan updated FLEX-34765:
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Attachment: FLEX-34765.patch
> ArrayCollection/ListCollectionView performance improvements
> -----------------------------------------------------------
>
> Key: FLEX-34765
> URL: https://issues.apache.org/jira/browse/FLEX-34765
> Project: Apache Flex
> Issue Type: Improvement
> Components: Collections
> Reporter: shane doolan
> Labels: newbie, performance
> Attachments: FLEX-34765.patch
>
>
> ListCollectionView immediatly adds a CollectionEvent listener to its source
> list, even though it only needs the events if sort is set, filterFunction is
> set, or it has a CollectionEvent listener of its own.
> ArrayList suppresses CollectionEvent creation if there is no CollectionEvent
> listener, so by only adding the listener when needed we get performance
> improvements and a reducing the number of CollectionEvent/Array allocations.
> Performance profiling of the patch:
> ||label||type||objectCount||addItemAtStart||addItemAtEnd||addItemAtRandom||removeItemAtStart||removeItemAtEnd||removeItemAtRandom||
> |Original ArrayCollection: original ArrayList|class
> ArrayCollection|100000|2538.556ms|2575.138ms|3268.842ms|3095.744ms|2555.533ms|2828.339ms|
> |Patched ArrayCollection: original ArrayList|class
> ArrayCollectionListenerPatch|100000|2339.321ms|2338.553ms|3080.970ms|2927.168ms|2364.032ms|2706.899ms|
> |Patched ArrayCollection: original ArrayList + CollectionEvent listener|class
> ArrayCollectionListenerPatch|100000|2561.900ms|2521.983ms|3262.963ms|3149.099ms|2533.680ms|2884.201ms|
> Performance profiling of the patch with the patched ArrayList from
> [FLEX-34759]:
> ||label||type||objectCount||addItemAtStart||addItemAtEnd||addItemAtRandom||removeItemAtStart||removeItemAtEnd||removeItemAtRandom||
> |Original ArrayCollection: patched ArrayList|class
> ArrayCollection|100000|240.839ms|273.501ms|3296.476ms|926.919ms|208.949ms|2856.562ms|
> |Patched ArrayCollection: patched ArrayList|class
> ArrayCollectionListenerPatch|100000|62.039ms|65.500ms|3131.238ms|706.865ms|36.314ms|2676.732ms|
> |Patched ArrayCollection: patched ArrayList + CollectionEvent listener|class
> ArrayCollectionListenerPatch|100000|298.581ms|243.448ms|3282.985ms|935.452ms|228.865ms|2880.552ms|
> In the above examples the, when the patched ArrayCollection doesn't have a
> CollectionEvent listener, sort, or filter it avoids allocation of 200,000
> unused CollectionEvents (2 for each add/remove - one from the array list, one
> cloned by the ListCollectionView)
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