Re: how to clear cache

[Armin Waibel]

Alessandro Colantoni wrote:

I think you are using the cache ObjectCachePerBrokerImpl.


Or the recommended two-level cache which has a session cache too.


In the method findbroker to put a condition that if the entry of
Mandragora.properties broker.useUserBroker is true, return the userbroker in
place of create a new broker.

And in all methods of OjbPbDAO , when they close the broker, put a
condition  that if broker.useUserBroker = true don't close, else close.

So it is user responsibility to create and close the broker.

With all of this your code should work. Of course remember to close the
broker.

Someone else (Armin? )agree with this?
I hope have been clear enough.

If OjbPbDAO can differ between user-PB and new-PB this should work, else 
 a user got problems when using both strategies - e.g. most times 
inject a user-PB, but from time to time using the ServiceLocator without 
injection of a user-PB (e.g. with default settings, based on the current 
PBKey, to perform a simple query).

In general, I think implementing ServiceLocator and DAO as singletons 
cause some drawbacks, because singletons make it impossible to use 
different PBKey (e.g. different databases) in the same 
web-project/application or in a multi-threaded environment.
If ServiceLocator isn't a singleton it can have a state (e.g. the user 
can specify a PBKey to force creation of specific PB instances).

regards,
Armin



Anyway Hans, download the source, and have a look, so you can help. look at
the OjbDAO methods.
They just use Ojb so it is very easy and we can solve this together.

if you and Armin agree I start as soon as possible, even if I'm going on
travel tomorrow until October the 3th


Thanks
and regards

Alessandro







On 9/26/07, Hans Novak <[EMAIL PROTECTED]> wrote:
Hi Allesandro,

i think im stupid - or - how we in germany say: i dont see the wood for
the trees ... ;-)
im my (ojb) dao class i use


public class PartnerFactoryCore {
   private PersistenceBroker broker = null;
   static Logger logger = Logger.getLogger("osf");

   public PartnerFactoryCore() {
       try {
           broker =
PersistenceBrokerFactory.defaultPersistenceBroker();
       } catch (Exception e) {
           e.printStackTrace();
           MsgBoxHn.msgBoxOK(e.getMessage().toString() +
"\n\n\nProgrammende.");
           System.exit(0);
       }
   }

   ....
}


I use mandragora for example to store an object like this:



   private void saveData(){
       formPartner = getPartnerFromForm();
       LOGGER.debug("Data Saving...");

       //old way!!! - do not delete objects in the collection tree
       //partnerFactoryCore.store(formPartner);  //from

       // new Way with mandragora
       try {
           BD bd =
ServiceLocator.getInstance
().getManagerBD("BDFactoryDefaultClass","StandardBDDefaultClass");
           bd.updateCollectionReferences(formPartner);
       } catch (Exception e) {
           e.printStackTrace();
       }

       LOGGER.debug(formPartner.toString(0));
   }



how can i put this 2 things together ?


Hans


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