registerExtension method Null safety

void registerExtension(
  1. String extension,
  2. VmServerConnection client
)

Registers extension for client.

All future requests for extension will be routed to client.

Implementation

void registerExtension(String extension, VmServerConnection client) {
  if (_extensionToConnection.containsKey(extension)) {
    throw RPCError('registerExtension', 111, 'Service already registered');
  }
  _eventController.sink.add(_toRegistrationEvent(extension));
  _extensionToConnection[extension] = client;
  // Remove the mapping if the client disconnects.
  client.done.whenComplete(() {
    _extensionToConnection.remove(extension);
    _eventController.sink.add(_toRegistrationEvent(extension,
        kind: EventKind.kServiceUnregistered));
  });
}