int priority = DEFAULT, Cancellable? cancellable = null) throws Error
int priority = DEFAULT, Cancellable? cancellable = null) throws Error
Execute the callback and wait for the result
This method will block until the event is triggered, then execute the callback and return the result
| func | the callback to execute once the event is triggered |
| priority | the priority of the callback |
| cancellable | optional cancellable for aborting |