[infinispan-dev] [hibernate-dev] [ISPN-6] (Infinispan cache provider for Hibernate) Remaining TODOs, notes and questions

[Galder Zamarreno]

On 08/10/2009 01:09 PM, Galder Zamarreno wrote:
>
> On 08/10/2009 12:42 PM, Manik Surtani wrote:

</snip>

>> Well, I think we need both.
>>
>> getConfiguration(String name) to retrieve a configuration template and
>> modify it.
>> defineCache(String newName, String templateName, Configuration
>> overrides) to create a new configuration based on an existing one. Maybe
>> this name should change to something more intuitive? Perhaps instead of
>> defineCache, we have:
>>
>> Configuration defineConfiguration(String configurationName,
>> Configuration overrides) // registers and names a NEW configuration,
>> based on the default cfg and the overrides passed in
>>
>> Configuration defineConfiguration(String configurationName, String
>> templateName, Configuration overrides) // registers and names a NEW
>> configuration, based on an existing, predefined configuration and the
>> overrides passed in
>>
>> WDYT?
>
> That would be a great way to combine the two API requirements. I assume
> that the returned Configuration instances returned would have had the
> overrides applied to them already.
>
> Let me work on this APIs in parallel to the work I'm doing for ISPN-6 so
> that I can fully exercise/test and see if there's anything we'd need to
> change.
>
> https://jira.jboss.org/jira/browse/ISPN-152

A quick update on this. I have implemented ISPN-152, integrated it with 
the cache provider and the tests I have are now passing. Just a heads up 
on a change of behaviour.

defineConfiguration(*) methods do no longer throw 
DuplicateCacheNameException since this limits the API a lot disabling 
any type of configuration redefininitions/overriding. Example:

defineConfiguration("entity", "entity", overrides);

This means, take the configuration for named cache "entity", apply 
overrides and use that as new "entity" cache name configuration. If 
we're throwing DuplicateCacheNameException(s), we wouldn't be able to do 
this and this seems like a valid use case to me.

By the way, I've already noted this in the javadoc but doing the following:

Configuration c = defineConfiguration("entity", new Configuration());

is a way to return "entity" named cache's configuration! (equivalent to 
doing something like: manager.getConfiguration("entity") if such method 
existed!) IOW, this defineConfiguration method is saying: "define a 
configuration, based on "entity" and apply no overrides (cos no setters 
have been called in the Configuration instance!) and return new 
configuration instance"

I've detailed all this in CacheManager's javadoc that you can find 
attached. If you get the chance, have a read to it and let me know if 
anything is not clear enough.

>
>> Cheers
>> --
>> Manik Surtani
>> manik at jboss.org
>> Lead, Infinispan
>> Lead, JBoss Cache
>> http://www.infinispan.org
>> http://www.jbosscache.org
>>
>>
>>
>>
>

-- 
Galder Zamarreño
Sr. Software Engineer
Infinispan, JBoss Cache
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