try {
      super.write(source, byteCount)
    } catch (e: IOException) {
      hasErrors = true
      onException(e)
    }
  }

  override fun flush() {
    if (hasErrors) {
      return
    }
    try {
      super.flush()
    } catch (e: IOException) {
      hasErrors = true
      onException(e)
    }
  }

  override fun close() {
    try {
      super.close()
    } catch (e: IOException) {

                        logger.debug("Failed to access to {}", request.getUrl(), e);
                    }

                    if (listener != null) {
                        listener.onException(this, request, count, e);
                    }

                    if (exceptionList == null) {
                        exceptionList = new ArrayList<>();
                    }

        public void onRequestEnd(final FaultTolerantClient client, RequestData request, final List<Exception> exceptionList) {
            endCount++;
        }

        @Override
        public void onException(final FaultTolerantClient client, RequestData request, final int count, final Exception e) {
            exceptionCount++;
            exceptionUrl = request.getUrl();
        }

    }

        def lock = createDefaultFileLock(target)
        try {
            lock.writeFile {
                throw new AnException()
            }
        } catch (AnException e) {
            lock.close()
        }
        lock = createDefaultFileLock(target)
        try {
            assert !lock.unlockedCleanly
        } finally {
            lock.close()
        }

    }