Can't use CacheAttribute on classes

nil4 · **Joined:** Sun May 14, 2006 3:49 pm **Posts:** 5

Using NHibernate.Mapping.Attributes, I can't use the CacheAttribute on a class -- I get this error from the compiler:

Code:

Attribute 'Cache' is not valid on this declaration type. It is valid on 'property, indexer, field' declarations only.

Is there any specific reason for this? Judging by the docs at http://www.hibernate.org/hib_docs/nhibernate/html/performance.html#performance-cache, it should be available on classes as well.

The application I'm working on is ASP.NET 2.0, using NHibernate version 1.2.0, and the declaration of the class I'm trying to cache is:

Code:

[Class(0, Table = "`sample`")]
[Cache(1, Usage = CacheUsage.ReadWrite)]
public partial class @Sample

nil4 · **Joined:** Sun May 14, 2006 3:49 pm **Posts:** 5

I tried to recompile the NHibernate.Mapping.Attributes project and add the System.AttributeTargets.Class target to CacheAttribute. Even using this newly compiled version, I get no <cache> or <jcs-cache> directly underneath <class> elements, using the default HbmSerializer.

I checked the nhibernate-mapping-2.0.xsd file, and as far as I can tell, it allows <cache> as children of the <class> element, so I'm totally lost on the cause of this.

Can anybody help?

nil4 · **Joined:** Sun May 14, 2006 3:49 pm **Posts:** 5

Anybody?

sergey · **Posted:** Mon May 15, 2006 7:29 am

I forwarded this topic to Pierre Henri Kuaté, the NHMA maintainer, so he should reply in a few days.

From what I know, NHMA is entirely automatically generated from the XSD schema, and attributes corresponding to elements nested inside of <class> element are generated with usage = property/field. I don't know if anything can be done about it, so please wait for Pierre Henri to reply.

KPixel · **Posted:** Mon May 15, 2006 9:31 am

As Sergey said, attributes corresponding to elements nested inside of <class> element must be applied to property/field (even if it doesn't really make sense as it is the case for CacheAttribute).

The right code is:

Code:

[Class(Table = "`sample`")]
public partial class @Sample
{
    [Cache(Usage = CacheUsage.ReadWrite)]
    private Type someField/Property;
}

nil4 · **Joined:** Sun May 14, 2006 3:49 pm **Posts:** 5

Does that mean the first field/property of the class, or will any field do the job?

KPixel · **Posted:** Wed May 17, 2006 1:20 am

"Any field/property do the job" :) (just make sure that it is the only NHMA attribute on it or that you put it first)

nil4 · **Joined:** Sun May 14, 2006 3:49 pm **Posts:** 5

Thank you very much! You saved my day.