) {
  private var lastId: String? = null

  interface Callback {
    fun onEvent(
      id: String?,
      type: String?,
      data: String,
    )

    fun onRetryChange(timeMs: Long)
  }

  /**
   * Process the next event. This will result in a single call to [Callback.onEvent] *unless* the
   * data section was empty. Any number of calls to [Callback.onRetryChange] may occur while

                return supportedLang;
            }
        }
        return null;
    }

    /**
     * Gets a list of language items for a given locale.
     *
     * @param locale The locale.
     * @return A list of language items.
     */
    public List<Map<String, String>> getLanguageItems(final Locale locale) {
        try {
            final String localeStr = locale.toString();

    call?.cancel()
  }

  override fun onEvent(
    id: String?,
    type: String?,
    data: String,
  ) {
    listener.onEvent(this, id, type, data)
  }

  override fun onRetryChange(timeMs: Long) {
    // Ignored. We do not auto-retry.
  }