question: void tick ( long index , long timestamp ) { if ( ! scheduledTasks . isEmpty ( ) ) { Iterator < ServerScheduledTask > iterator = scheduledTasks . iterator ( ) ; while ( iterator . hasNext ( ) ) { ServerScheduledTask task = iterator . next ( ) ; if ( task . complete ( timestamp ) ) { context . update ( index , Instant . ofEpochMilli ( task . time ) , ServerStateMachineContext . Type . COMMAND ) ; task . execute ( ) ; complete . add ( task ) ; iterator . remove ( ) ; } else { break ; } } for ( ServerScheduledTask task : complete ) { task . reschedule ( ) ; } complete . clear ( ) ; } }
target:  Executes scheduled callbacks based on the provided time.