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Posted to dev@sling.apache.org by "Radu Cotescu (JIRA)" <ji...@apache.org> on 2015/07/14 14:04:05 UTC
[jira] [Resolved] (SLING-913) Add a cache for pre-compiled scripts
[ https://issues.apache.org/jira/browse/SLING-913?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Radu Cotescu resolved SLING-913.
--------------------------------
Resolution: Fixed
Fix Version/s: Scripting Core 2.0.30
Scripting API 2.1.8
Fixed in [r1690904|svn.apache.org/r1690904].
> Add a cache for pre-compiled scripts
> ------------------------------------
>
> Key: SLING-913
> URL: https://issues.apache.org/jira/browse/SLING-913
> Project: Sling
> Issue Type: New Feature
> Components: Scripting
> Affects Versions: Scripting Core 2.0.2
> Reporter: Felix Meschberger
> Assignee: Radu Cotescu
> Fix For: Scripting API 2.1.8, Scripting Core 2.0.30
>
> Attachments: SLING-913.patch, SLING-913_eventcache.patch
>
>
> The Java Scripting API provides support for scripting langugages which may precompile script source and reuse the precompiled scripts:
> javax.script.Compilable: May be implemented by a ScriptEngine if precompilation is
> supported
> javax.script.CompiledScript: Result of calling the Compilable.compile method.
> The CompiledScript can be called to repeatedly execute the script without the need for recompilation and thus for improved performance.
> The Sling Core Scripting support should make use of this functionality by maintaining a cache compiled scripts with the following properties
> * indexed by script path
> * size limited (using LinkedHashMap overwriting the removeEldestEntry method)
> * entries are weak or soft references ot cache entries
> A cache entry consists of the following information:
> * The CompiledScript instance
> * The time of last compilation. this is compared to the last modification time of the script to decide on whether to recompile
> We might probaly also try to add a reference to the script engine implementation bundle to only use the cache entry if the bundle has not been stopped since adding the cache entry
> Executing the script would then consist of the following steps:
> 1 Check the cache of precompiled scripts. if an entry exists and can be used, use it
> 2. if the ScriptEngine is Compilable:
> 2a. Compile the script and add it to the cache and use it
> 2b. Otherwise have the script engine execute the script
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