private MinMaxPriorityQueue<LinkRelevance> newPriorityQueue(int maxSize) {
        return MinMaxPriorityQueue
                .orderedBy(LinkRelevance.DESC_ORDER_COMPARATOR)
                .maximumSize(maxSize)
                .create();
    }
Implements a link selection strategy that tries to select the top-k links from all different
top-level domains.
ache/src/main/java/achecrawler/link/frontier/selector/MaximizeWebsitesLinkSelector.java