Remove the object from drools session and reuse the same session in spring

Question

I am using an autowired StatefulKnowledgeSession in a service class.

@Service("vbOrderService")
public class VbOrderService {
    
    @Autowired
    private VbOrderDao vbOrderDao ;
    
    @Autowired
    StatefulKnowledgeSession vbDiscSession;
    
    public CpSellerDetails getStep1Data(Integer grpSellerId,Integer catalogueId) throws DataNotFoundException{
        return vbOrderDao.getStep1Data(grpSellerId,null,catalogueId);
    }
    /*public CpSellerDetails getStep1Data(Integer cp_id,Integer orderno) throws DataNotFoundException{
        return vbOrderDao.getStep1Data(cp_id,orderno);
    }*/
    public void getStep2Data(Integer cp_id,VbCpInfoBean info) throws DataNotFoundException{
        vbOrderDao.getStep2Data(cp_id,info);
    }
    public Integer updateStep2Data(VbCpInfoBean info,Integer cp_id) throws UpdateFailedException{
        return vbOrderDao.updateStep2Data(info,cp_id);
    }
    
    public void getOrderStep3(CpSellerDetails sellerDetails) throws DataNotFoundException {
         vbOrderDao.getOrderStep3(sellerDetails);
          fireRules(sellerDetails);
    }
    public void orderStep4(LoginBean user,CpSellerDetails sellerDetails) throws UpdateFailedException {
         vbOrderDao.orderStep4(user,sellerDetails);
        // fireRules(sellerDetails);
    }
    public CpSellerDetails getOrderDetailsForPdfGeneration(String orderno,
            int user) throws DataNotFoundException {
        return vbOrderDao.getOrderDetailsForPdfGeneratio(orderno,user);
    }
    public void addNewAddress(Address address) throws UpdateFailedException {
        vbOrderDao.addNewAddress(address);
    }
    private void fireRules(CpSellerDetails sellerDetails){
        vbDiscSession.insert(sellerDetails);
        vbDiscSession.fireAllRules();
    }
}

Is it possible to remove the inserted object from session in fireRules() called from getOrderStep3() and reuse the same StatefulKnowledgeSession for further requests.If possible how can it be achieved

Answer 1

I often do this to ensure performance on a session where it would take time to re-insert large numbers of 'static data' facts.

// Insert a fact and get a handle on to it
FactHandle handle = mySession.insert(myFact);

// Fire rules
mySession.fireAllRules();

// And retract the fact
mySession.retract(handle);

You may wish to fire all rules again after the retract to bring the session back to its previous state.