@Contract public interface ProgressStartedListener
Lengthy operations should not be performed in the listener since that may impact the performance of the RunLevelController calling the listener
void onProgressStarting(ChangeableRunLevelFuture currentJob, int currentLevel)
Any exception thrown from this method is ignored
currentJob- the job currently running
currentLevel- the level that the system is currently at before any work has been done to move the system up or down
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