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Re: [eclipselink-dev] how to set <shared-cache-mode>ENABLE_SELECTIVE</shared-cache-mode> dynamically
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Hi Adrian,
There is no specific API that makes ENABLE_SELECTIVE work - ENABLE_SELECTIVE,
just means we individually process cache settings for each entity.
One thing you might be able to do is use the cache defaults settings in
persistence.xml and then use a session customizer to override.
http://wiki.eclipse.org/Using_EclipseLink_JPA_Extensions_%28ELUG%29#Using_EclipseLink_JPA_Extensions_for_Entity_Caching
http://wiki.eclipse.org/Using_EclipseLink_JPA_Extensions_%28ELUG%29#Using_EclipseLink_JPA_Extensions_for_Customization_and_Optimization
-Tom
Goerler, Adrian wrote:
Hi Tom,
I'd like to stick as close to JPA as possible and use the @Cacheable to selectively enable caching for entities. However, I'd like to default cacheability to false. I understand that I can configure the individual cache settings per entity class using a ClassDescriptor. But I am fine with @Cacheable. My only issue is that I can't use the <shared-cache-mode>ENABLE_SELECTIVE</shared-cache-mode> switch in NetWeaver AS Java as the JPA container will reject the <shared-cache-mode> tag.
Can I achieve the effect of <shared-cache-mode>ENABLE_SELECTIVE</shared-cache-mode> through a SessionCustomizer?
Thanks,
Adrian
Adrian Görler
SAP AG
Pflichtangaben/Mandatory Disclosure Statements:
http://www.sap.com/company/legal/impressum.epx
-----Original Message-----
From: eclipselink-dev-bounces@xxxxxxxxxxx [mailto:eclipselink-dev-bounces@xxxxxxxxxxx] On Behalf Of Tom Ware
Sent: Dienstag, 8. Februar 2011 15:02
To: Dev mailing list for Eclipse Persistence Services
Subject: Re: [eclipselink-dev] how to set <shared-cache-mode>ENABLE_SELECTIVE</shared-cache-mode> dynamically
Hi Adrian,
This setting allows individual Entities to have their own cache settings.
The way to get at the cache settings is to get the ClassDescriptors from the
Project. The project is stored in the Session held by the EntityManagerFactory.
ClassDescriptor has methods like setIdentityMapClass, setIdentityMapSize that
control the cache
The best way to access these things at runtime is through a SessionCustomizer.
If you need to make changes later than the SessionCustomizer runs,
org.eclipse.persistence.jpa.JpaHelper has methods that allow you to unwrap the
various internal components, but you'll have to be careful after you have
started to do things that put elements in the cache and may have to do some
additional work to get things working because the initialization of the
descriptors handles some of configuration.
-Tom
Goerler, Adrian wrote:
Hi,
yes, I can confirm this.
I just don't know how to achieve the effect of
<shared-cache-mode>ENABLE_SELECTIVE</shared-cache-mode> dynamically.
Best regards,
Adrian
*Adrian Görler
**SAP AG
*Pflichtangaben/Mandatory Disclosure Statements:
http://www.sap.com/company/legal/impressum.epx
*From:* Rohit Banga [mailto:rohit.banga@xxxxxxxxxx]
*Sent:* Dienstag, 8. Februar 2011 08:55
*To:* Dev mailing list for Eclipse Persistence Services
*Cc:* Goerler, Adrian
*Subject:* Re: [eclipselink-dev] how to set
<shared-cache-mode>ENABLE_SELECTIVE</shared-cache-mode> dynamically
Hi Adrian
It seems to me that this feature was added as part of JPA 2.0.
http://wiki.eclipse.org/EclipseLink/Development/JPA_2.0/cache_usaged#Section_3.7.1_-_The_shared-cache-mode_element
Can someone please confirm this?
On 2/8/2011 1:14 PM, Goerler, Adrian wrote:
Hi,
is there a way to specify
<shared-cache-mode>ENABLE_SELECTIVE</shared-cache-mode> dynamically? In
my server, I can't specify this element statically, as it is rejected by
my servers JPA (1.0) container.
There is the property <property name="eclipselink.cache.shared.default"
value="false"/>, but it is not equivalent as it cannot be overridden
with @Cacheable.
Best regards,
Adrian
*Adrian Görler
**SAP AG
*Pflichtangaben/Mandatory Disclosure Statements:
http://www.sap.com/company/legal/impressum.epx
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--
Thanks and Regards
Rohit Banga
Member Technical Staff
Oracle Server Technologies
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