docs: private void putToSessionCache(Identity oid, CacheEntry entry, boolean onlyIfNew)
      {
          if(onlyIfNew)
          {
              // no synchronization needed, because session cache was used per broker instance
              if(!sessionCache.containsKey(oid)) sessionCache.put(oid, entry);
          }
          else
          {
              sessionCache.put(oid, entry);
          }
      }