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From Gerhard Petracek <gerhard.petra...@gmail.com>
Subject Re: [ExtVal] ExtVal-metadata-provider addon (performance) improvement
Date Wed, 24 Feb 2010 08:49:47 GMT
hi rudy,

thx for providing the improvement.
i'll have a look at it after the jsfdays.

regards,
gerhard

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2010/2/24 Rudy De Busscher <rdebusscher@gmail.com>

> Hi all,
>
> With the Extval metadata provider addon, the developer has the possibility
> to specify the packages that needs to be scanned for the @MetaDataProvider.
> However, doing this, results in some performance penalty.
>
> During initialization of the MetaDataProviderStorage class, it stores the
> information in the property customMetaDataProviderStorage.  This property is
> not consulted (not immediately) when a metadata provider class is requested
> from the storage.  And the scanning is performed again in the method
> getMetaDataProviderClassFor and now kept in metaDataProviderStorage
> property.
>
> As a side effect of keeping 2 properties, the result of the method is a
> list that contains twice the metadata provider class. The doubles are
> handled correctly in the
> MetaDataProviderScanningInterceptor.createAdditionalMetaDataEntries and thus
> only processed once (but instantiated twice)
>
> The advanced metadata addon has the same 'defect'.
>
> Possible solutions
> 1) keep the 2 properties (customMetaDataProviderStorage and
> metaDataProviderStorage) but add following code just before the try in the
> getMetaDataProviderClassFor method
>
> *        if(this.customMetaDataProviderStorage.containsKey(sourceClass))
>         {
>             return this.customMetaDataProviderStorage.get(sourceClass);
>         }*
> although rewrite is a better option.
>
> 2) remove the 'double' storage property (remove the
> customMetaDataProviderStorage) and the getMetaDataProviderClassFor method
> could look like this:
>    * public List<Class> getMetaDataProviderClassFor(Class sourceClass)
>     {
>         if(this.metaDataProviderStorage.containsKey(sourceClass))
>         {
>             return this.metaDataProviderStorage.get(sourceClass);
>         }
>
>         try
>         {
>             for(Class foundProvider :
> processTarget(sourceClass.getPackage().getName()))
>             {
>                 addMetaDataProvider(sourceClass, foundProvider,
> this.metaDataProviderStorage);
>             }
>
>         }
>         catch(Throwable t)
>         {
>             if(this.logger.isWarnEnabled())
>             {
>                 this.logger.warn("unable to setup annotation based metadata
> provider for " + sourceClass.getName(), t);
>             }
>
>             this.metaDataProviderStorage.put(sourceClass, null);
>         }
>
>         return this.metaDataProviderStorage.get(sourceClass);
>     }*
>
> and use the metaDataProviderStorage in the constructor instead of the
> removed property.
>
> regards
> Rudy
>

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