JPA2.0支持自定义用户类型和二级缓存 [英] JPA2.0 support of custom user-types and second level cache

问题描述

我试图决定是否从 Hibernate 全部转换为使用 JPA2.0 以及因此是提供者可移植的。

1.Does JPA2.0 支持自定义用户类型？

2.I'm on主要考虑将 Terracotta 作为二级缓存来实现 Hibernate 的边界。我可以想象，但我实际上并不知道， JPA2.0 也为二级缓存提供者定义了一个规范。如果我是对的， Terracotta 是否实现它？ （如果有人可以指点我开始使用 Terracotta 和 JPA 我很感激它）。

在此先感谢，

Ittai

解决方案

JPA2.0是否支持自定义用户类型？

没有超出 @Embedded 和 @Embeddable （已在JPA 1.0中）。根据您的需求的复杂程度，他们可能会完成这项工作）。

我会想象，但我实际上不知道， JPA2.0还为二级缓存提供者定义了一个规范。

JPA 2.0在 EntityManager 上定义了访问二级缓存的方法，由持久性提供者维护，一个 Cacheable 注释，以及其他一些事情。但是，在您的JPA提供程序上插入缓存的方式是特定于提供程序的。所以不，JPA没有为L2缓存提供者定义规范。如果您希望将Terracota作为使用Hibernate的L2缓存提供程序作为JPA 2.0实现，请参阅Hibernate集成文档。

参考

• JPA 2.0规范
  
  
  
  
  • 第3.7节缓存
    
  • 第7.10节缓存接口
    
  • 第11.1.7节缓存注释
    
  
  
  
  

  I'm trying to decide whether to switch from having Hibernate sprinkled all over to using JPA2.0 and thus be provider portable.
  1.Does JPA2.0 support custom user-types?
  2.I'm on the verge of implementing Terracotta as a second-level cache to Hibernate with its clustering abilities mainly in mind. I would imagine, but I don't actually know, that JPA2.0 also defines a spec for second-level cache providers. If I'm right, does Terracotta implement it? (If someone could point me to a getting started with Terracotta and JPA I'd appreciate it).

  Thanks in advance,
  Ittai

  解决方案

  Does JPA2.0 support custom user-types?

  Nothing beyond @Embedded and @Embeddable (already in JPA 1.0). Depending on the complexity of your needs, they might do the job).

  I would imagine, but I don't actually know, that JPA2.0 also defines a spec for second-level cache providers.

  JPA 2.0 defines methods on the EntityManager to access the second level cache that is maintained by the persistence provider, a Cacheable annotation, some other things. But the way to plug a cache on your JPA provider is provider specific. So no, JPA doesn't define a spec for L2 cache providers. And if you want to use Terracota as the L2 cache provider with Hibernate as JPA 2.0 implementation, look at the Hibernate integration documentation.

  References

  • JPA 2.0 specification
    • Section 3.7 "Caching"
    • Section 7.10 "Cache Interface"
    • Section 11.1.7 "Cacheable Annotation"

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