Re: [infinispan-dev] [ISPN-31]JPA based cache store
On 23 Jul 2009, at 15:34, Alejandro Montenegro wrote:
Hi guys,
some thought about this issue. Mainly there are two option for the
implementation:
1- Objects stored in cache are by themselves Entites (marked with an
@Entity)
2- Create a kind of wrapper Entity for non-entities objects
[1] Are more straight forward and should perform better, but are
restricted to Enities
[2] Are more complex to develop, as have to figure out a good
structure fot the wrapper, but satifies a lot of more use cases.
I think we can offer both. The cache store could maintain two hash
sets - known @Entity types and known types that are not entities.
These would be populated lazily by testing for the @Entity annotation
every time a new user type is encountered. These sets could then be
consulted when deciding how to persist an object: either treat it as a
an @Entity or wrap it in an EntityContainer.
The structure of an EntityContainer should be pretty straightforward,
where it would contain two fields: a byte[] to hold the serialized
form of the object being stored, and an ID which could be an auto
incrementing key.
In either case you would still need a key -> value_id mapping entity,
so when folks perform a lookup based on a key, you are able to locate
the value.
Cheers
--
Manik Surtani
manik(a)jboss.org
Lead, Infinispan
Lead, JBoss Cache
http://www.infinispan.org
http://www.jbosscache.org