return the public interface for scheduler service . concode_field_sep ScheduledExecutorService scheduler concode_elem_sep String SCHEDULER_THREADS concode_elem_sep XLog log concode_elem_sep long millis concode_elem_sep String CONF_PREFIX concode_field_sep void init concode_elem_sep void schedule concode_elem_sep void schedule concode_elem_sep void destroy concode_elem_sep ScheduledExecutorService getScheduler concode_elem_sep long getMillis