close method
Releases an Isar instance.
If this is the only isolate that holds a reference to this instance, the Isar instance will be closed.
Implementation
Future close() {
_isOpen = false;
if (identical(_instances[name], this)) {
_instances.remove(name);
if (_instances.isEmpty) {
_schema = null;
}
}
for (var callback in _closeCallbacks) {
callback(name);
}
return Future.value();
}