subscribe method

void subscribe(
  1. VoidCallback listener
)

Registers a listener that will be called every time ping is invoked.

Throws an AssertionError if the Pingora has already been disposed.

Implementation

void subscribe(VoidCallback listener) {
  assert(
    !_disposed,
    AssertionError('Can not subscribe to a disposed Pingora'),
  );
  _listeners.add(listener);
  developer.log(
    'Pingora<$runtimeType> subscribed (listeners: ${_listeners.length})',
    name: 'pingora',
  );
}