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https://issues.apache.org/jira/browse/TRINIDAD-2515?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Anand V Nath updated TRINIDAD-2515:
-----------------------------------
Status: Patch Available (was: Open)
> Avoid caching skins from external SkinProviders and make LRU cache concurrent
> -----------------------------------------------------------------------------
>
> Key: TRINIDAD-2515
> URL: https://issues.apache.org/jira/browse/TRINIDAD-2515
> Project: MyFaces Trinidad
> Issue Type: Bug
> Components: Skinning
> Affects Versions: 2.1.0-core
> Reporter: Anand V Nath
> Attachments: jira-2515.patch, test-skin-and-images.zip
>
>
> Problem statement:
> SkinProvider SPI allows creation of external skin repositories and plug it
> into trinidad skin framework. Skin framework should allow such skins to be
> managed (created, cached, destroyed) by the SkinProvider. Currently this is
> not happening.
> Internal problem description:
> When user requests a Skin, skin framework creates a StyleProvider for it.
> This StyleProvider is cached at application level and reused for subsequent
> requests for the same Skin. Since the StyleProvider contains the Skin, it
> effectively caches the Skin also.
> Solution:
> Don't cache StyleProvider associated with Skins served from external
> SkinProviders. For achieveing this introduce isCacheable API on SkinImpl and
> implement it in SkinExtension:
> {code}
> /**
> * Used by SkinStyleProvider to decide whether to cache the StyleProvider
> or not.
> * @return true if skin is internal to the framework.
> */
> public abstract boolean isCacheable();
> {code}
> In SkinExtension introduce overloaded constructor for handling internal Skin
> creation and external Skin creation (through SkinFactory.createSkin)
> {code}
> /**
> * Creates SkinExtension from SkinMetadata and base Skin
> * This constructor is used for creating skins for external SkinProvider
> implementations.
> * We keep skins thus created as not-cacheable.
> * @see org.apache.myfaces.trinidadinternal.skin.SkinFactoryImpl
> * @param baseSkin
> * @param skinMetadata
> */
> public SkinExtension(Skin baseSkin, SkinMetadata skinMetadata)
> {
> this(baseSkin, skinMetadata, false);
> }
> /**
> * Creates SkinExtension from SkinMetadata, base Skin and cacheability
> * This constructor is used only for INTERNAL skins
> * @see
> org.apache.myfaces.trinidadinternal.skin.provider.TrinidadSkinProvider
> * @param baseSkin
> * @param skinMetadata
> */
> public SkinExtension(Skin baseSkin, SkinMetadata skinMetadata, boolean
> isCacheable)
> {
> // existing code:
> // read values from skinMetadata and set
> _isCacheable = isCacheable;
> }
> {code}
> Check SkinImpl.isCacheable() before caching the StyleProvider.
> For solving the concurrency issue in LRU cache used for caching
> StyleProviders, introduce new CopyOnWriteArrayMap and use it.
> For testing add SkinProvider test cases, CopyOnWriteArrayMap test cases.
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