void function ( String arg0 ) { scheduledService = Optional . of ( SafeExecutors . newSingleThreadScheduledExecutor ( arg0 ) ) ; }
provide a single thread scheduled executor concode_field_sep Logger log concode_elem_sep Optional<ListeningExecutorService> service concode_elem_sep Optional<ListeningScheduledExecutorService> scheduledService concode_field_sep Optional<ListeningExecutorService> getExecutorServiceOptional concode_elem_sep ListeningExecutorService getExecutorService concode_elem_sep boolean start concode_elem_sep void requireSingleThreadExecutor concode_elem_sep void requireFixedThreadPoolExecutor concode_elem_sep void onShutdownEvent concode_elem_sep void stopAndWait concode_elem_sep ListeningScheduledExecutorService getScheduledExecutorService