docs: public long addEntry(UniqueKeyGenerator generator) throws PersistenceException
      {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.entry(tc, "addEntry", "GeneratorName="+generator.getName());
  
          if (!_generators.containsKey(generator.getName()))
          {
              Transaction transaction = null;
  
              try
              {
                  transaction = _objectManager.getTransaction();
  
                  // Add the ManagedObject for this generator
                  UniqueKeyGeneratorManagedObject uniqueKey = new UniqueKeyGeneratorManagedObject(generator);
                  Token uniqueKeyToken = _objectStore.allocate(uniqueKey);
                  transaction.add(uniqueKey);
  
                  // Add token to the list of generators
                  LinkedList list = (LinkedList)_uniqueKeyRootToken.getManagedObject();
                  list.add(uniqueKeyToken, transaction);
  
                  // Commit all of the work
                  transaction.commit(false);
  
                  // Store the token in our list to access at runtime.
                  _generators.put(generator.getName(), uniqueKey);
              }
              catch (ObjectManagerException ome)
              {
                  com.ibm.ws.ffdc.FFDCFilter.processException(ome, "com.ibm.ws.sib.msgstore.persistence.objectManager.UniqueKeyRangeManager.addEntry", "1:217:1.8", this);
                  if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.event(tc, "Exception caught creating new unique key generator!", ome);
  
                  if (transaction != null)
                  {
                      try
                      {
                          // Clean up our ObjectManager work.
                          transaction.backout(false);
                      }
                      catch (ObjectManagerException e)
                      {
                          com.ibm.ws.ffdc.FFDCFilter.processException(e, "com.ibm.ws.sib.msgstore.persistence.objectManager.UniqueKeyRangeManager.addEntry", "1:229:1.8", this);
                          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.event(tc, "Exception caught backing out unique key generator creation!", e);
                      }
                  }
  
                  if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.exit(tc, "addEntry");
                  throw new PersistenceException("Exception caught creating new unique key generator!", ome);
              }
          }
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.exit(tc, "addEntry", "return="+UNIQUE_KEY_INITIAL_VALUE);
          return UNIQUE_KEY_INITIAL_VALUE;
      }