updateMetaData method

Future<Map<String, String>> updateMetaData(
  1. Map<String, String> metaData
)

Updates meta data on this channel with metaData.

It returns Map<String, String> that newly updated. Once it completes successfully, channel event ChannelEventHandler.onMetaDataUpdated will be invoked.

Implementation

Future<Map<String, String>> updateMetaData(
    Map<String, String> metaData) async {
  if (metaData.isEmpty) {
    throw InvalidParameterError();
  }

  final result = await _sdk.api.send<MetaDataResponse>(
    ChannelMetaDataUpdateRequest(
      channelType: channelType,
      channelUrl: channelUrl,
      metaData: metaData,
    ),
  );

  final cached = _sdk.cache.find<CachedDataMap>(channelKey: channelUrl) ??
      CachedDataMap<String>(
        channelType: channelType,
        channelUrl: channelUrl,
        timestamp: result.ts,
      );
  cached.addMap(result.metadata, result.ts);
  cached.saveToCache();

  return result.metadata;
}