code: public boolean isSameSession() {
          String sessionId = sessionIdProvider.get();
          if (callbackStartSessionId == null) {
              return sessionId == null;
          }
          return callbackStartSessionId.equals(sessionId);
      }
docs: Checks if currently we are during same session that we were during
  callback creation.
  
  @return True if we are still during same session, false otherwise.