code: public void start(IStore store, int interval) {
          synchronized (this) {
              _invalInterval = interval;
              _timer = new Timer(true);
              _invalTask = new InvalidationTask(store);
              _timer.schedule(_invalTask, _delay * 1000, _invalInterval * 1000);
          }
      }
docs: Method setStorageInterval
  <p>
  
  @param interval
  @see com.ibm.wsspi.session.IStorer#setStorageInterval(int)