default void workerQueued(AlignCalcWorkerI worker) {}
default void workerStarted(AlignCalcWorkerI worker) {}
default void workerCompleted(AlignCalcWorkerI worker) {}
+ default void workerCancelled(AlignCalcWorkerI worker) {}
default void workerExceptional(AlignCalcWorkerI worker, Throwable throwable) {}
}