code: public void flushDiskCacheAsyncWithDelay(int delay) {
          if (DEBUG) {
              CLog.d(LOG_TAG, "%s, flushDiskCacheAsyncWithDelay", delay);
          }
          if (mIsDelayFlushing) {
              return;
          }
          mIsDelayFlushing = true;
          new FileCacheTask(TASK_FLUSH_CACHE).executeAfter(delay);
      }
docs: flush the data to disk cache