registerService method
Implementation
Future<CosService> registerService(
String serviceKey, CosXmlServiceConfig config) async {
if (serviceKey == defaultKey) {
throw IllegalArgumentException("register key cannot be empty");
}
String key = await _cosApi.registerService(serviceKey, config);
var cosService = CosService(key);
_cosServices[key] = cosService;
return cosService;
}