Re: [eclipselink-users] [MOXy] caching

["polly.c.chang" <polly.c.chang@xxxxxxxxx>]

Hi Blaise,

Thanks for the quick reply!  So far we are happy with the performance
results.  MOXy compares favorably with JiBX (the existing technology that we
are using).  There are a couple of weird cases where unmarshalling more
domain objects is faster than unmarshalling fewer domain objects, but I
think we can move on.  We have other pressing things to worry about.  ;)

In case you are interested in how we use MOXy:
* We do not use XMLBinder/Binder.
* We do not use document preservation.
* We create one XMLContext and use it for the life of the application.
* We do use the native EclipseLink XMLUnmarshaller class, and I did not know
that the performance is better with the JAXB implementation of the
Unmarshaller.  We can look at this in the future.

Thanks for your help!
Polly


Blaise Doughan wrote:
> 
> Hi Polly,
> 
> The only time EclipseLink caches objects if you are using the Binder 
> (org.eclipse.persistence.oxm.XMLBinder or javax.xml.bind.Binder.) 
> mechanism or if you have configured your XML descriptor to use document 
> preservation.
> 
> For performance testing the following are some items to be aware of:
> 
>     * Both XMLContext and JAXBContext are thread safe and only need to
>       be created once.
>     * For unmarshalling of Streams it is actually faster to use our JAXB
>       implementation of Unmarshaller rather than the native
>       XMLUnmarshaller as the JAXB implementation uses StAX to perform
>       the XML processing.  The native XMLUnmarshaller uses SAX to avoid
>       forcing a runtime dependency on the StAX library.
> 
> -Blaise
> 
> polly.c.chang wrote:
>> Hi,
>>
>> Does EclipseLink do any caching with MOXy?  We were doing some
>> performance
>> tests and getting some strange results sometimes.  I know there is
>> caching
>> used for the database-related part of EclipseLink.  Is any of that used
>> for
>> MOXy?  Do you cache either the domain objects or the XML documents that
>> are
>> being marshalled/unmarshalled?
>>
>> Thanks,
>> Polly
>>   
> 
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