question: public void start ( boolean daemon , int thread_priority ) { if ( thread_priority < Thread . MIN_PRIORITY ) throw new IllegalArgumentException ( "thread priority too low" ) ; if ( thread_priority > Thread . MAX_PRIORITY ) throw new IllegalArgumentException ( "thread priority too high" ) ; start_ ( Executors . newSingleThreadScheduledExecutor ( null ) , true ) ; }
target:  Start the push processor, using a daemon thread.