Re: advantage of forceProxies=true?

Hi,

MA wrote:
> Hi ,
> 
> I wanted to know the best setting for performance.
> I have a Table A and a table B (1:n) with the n side relationship having
> potentially large data.
> 
> So if i use ObjectCacheTwoLevel and forceProxies=true will the n side be a
> collection proxy?

yep!

> The problem i have is if i make this property
> forceProxies=true every relationship of the main object looked up is a
> proxy(and i don't want this behaviour for 1:1). Does this setting improve
> performance? or if i defined proxy classes or collection proxy in my
> repository_user will be behaviour be same?

Instead of using the cache forceProxies=true setting you can manage the 
the proxy creation more fine grained using the "proxy" attribute in 
reference-descriptor and collection-descriptor.

> That is
> if in Class A - Class B(1:n) ,A is looked up from cache, I want to know ifl
> the objects in relationship "rel" be materialized,? 
> if I use
> forceProxies=false and the definition in repository_user.xml is something
> like below
> 
> <class-descriptor class="ClassA">
> <field-descriptor...../>
> .....
> <collection-descriptor name="rel" collection-class="ManageableArrayList"
> element-class-ref="ClassB" proxy="true">
> <inverse-foreign field-ref="bpk"/>
> </collection-descriptor>
> </class-descriptor>

No, in this case the proxy is used too. The "forceProxies=true" 
attribute only forces the use of proxies, if 'false' the settings in 
reference/collection-descriptor is used.
http://db.apache.org/ojb/docu/guides/objectcache.html#ObjectCacheTwoLevelImpl

regards,
Armin