update abstract method Null safety

void update(
  1. void action(
    1. MutableSubscriptionSet mutableSubscriptions

Update the subscription set and send the request to the server in the background.

Calling update is a prerequisite for mutating the subscription set, using a MutableSubscriptionSet passed to the action.

If you want to wait for the server to acknowledge and send back the data that matches the updated subscriptions, use waitForSynchronization.


void update(void Function(MutableSubscriptionSet mutableSubscriptions) action);