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From "Leonardo Uribe (Commented) (JIRA)" <>
Subject [jira] [Commented] (MYFACES-3435) [perf] _DeltaList: use ArrayList as parent
Date Tue, 06 Mar 2012 17:18:58 GMT


Leonardo Uribe commented on MYFACES-3435:

I have checked again the patch and I founded some inconsistencies in FacetHashMap that were
fixed in _ComponentFacetMap some time ago (implement fully Set interface for entrySet(), keySet()
and valuesSet() ). Here is when delegation pattern shines. It is possible to use ArrayMap
instead HashMap and improve performance in one step. If we use inheritance, I don't want to
imagine the work required to fix this.

I'm still thinking we can do other improvements (adjust structures sizes, cache some variables
in some parts, ... ) and get bigger improvements without sacrify the code structure. In other
words, there are other parts of the code that generate a lot more objects that this place.

Anyway, I splitted the patch in two and I applied it partially, adjusting the structure's
size and replacing HashMap with ArrayMap for facets. The other part of the patch (MYFACES-3435-7.patch)
was attached here if in the future we came back to this point again. I'll let this issue open,
but for now that's all I'm going to do for the next release cycle.
> [perf] _DeltaList: use ArrayList as parent
> ------------------------------------------
>                 Key: MYFACES-3435
>                 URL:
>             Project: MyFaces Core
>          Issue Type: Improvement
>          Components: General
>    Affects Versions: 2.0.12-SNAPSHOT, 2.1.6-SNAPSHOT
>            Reporter: Martin Kočí
>            Assignee: Martin Kočí
>            Priority: Minor
>         Attachments: MYFACES-3435-2.patch, MYFACES-3435-7.patch, MYFACES-3435.patch,
> Two internal classes _DeltaList in API:
> 1) now use delegation pattern, but are always initialized with an ArrayList instance
-> use inheritance and  ArrayList as parent -> improvement in memory area, reduces number
of GCed object in one request/response of (_DeltaList instances/2) 
> 2) initialize expected size of _DeltaList (for example, number of validators per one
component is perhaps never 10, use: new _DeltaList(5))
> 3) use indexes in 'for' instead of iterator (java.util.RandomAccess) ->  improvement
in performance

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