Re: how to clear cache

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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>