perf: save memory by sharing selector objects in filesystemstylecache
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Key: TRINIDAD-2032
URL: https://issues.apache.org/jira/browse/TRINIDAD-2032
Project: MyFaces Trinidad
Issue Type: Improvement
Components: Skinning
Reporter: Jeanne Waldman
Assignee: Jeanne Waldman
We can save memory if we store Selectors in a <Selector, Selector> map at the
FileSystemStyleCache level, and reuse where we can.
The implementation will be similar to what we did in TRINIDAD-2025 where we
reused
Style objects. Selector objects are only 16 bytes each, but each
FileSystemStyleCache$StylesImpl instance creates about 4500 of them for our
complicated skin.
Before Selector sharing:
FSSC$Entry about 335K each of retained size.
FSSC$StylesImpl about 214K each of retained size
run a page in 3 diff browsers, and we have 13402 Selector objects, total 214K
retained size
After Selector sharing:
FSSC$Entry about 263K each of retained size.
FSSC$StylesImpl about 142K each of retained size
run a page in 3 diff browsers, and we have 4533 Selector objects using 72.5K
Retained Size
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