@Override
        public int compare(Request o1, Request o2) {
            return -NumberUtils.compareLong(o1.getPriority(), o2.getPriority());
        }
Priority scheduler. Request with higher priority will poll earlier. <br>

@author code4crafter@gmail.com <br>
@since 0.2.1
webmagic-core/src/main/java/us/codecraft/webmagic/scheduler/PriorityScheduler.java