@Override
    public int getTotalRequestsCount(Task task) {
        return getDuplicateRemover().getTotalRequestsCount(task);
    }
Creates a {@code QueueScheduler} with the given (fixed) capacity.

@param capacity the capacity of this queue,
see {@link LinkedBlockingQueue#LinkedBlockingQueue(int)}
@since 0.8.0
webmagic-core/src/main/java/us/codecraft/webmagic/scheduler/QueueScheduler.java