Get the String key (name) of the queue to which the
CrawlURI should be assigned.
Note that changes to the CrawlURI, or its associated
components (such as CrawlServer), may change its queue
assignment.
Parameters: controller - This crawls' controller. Parameters: cauri - CandidateURI to calculate class key for. the String key of the queue to assign the CrawlURI
Returns the maximum number of different keys this policy
can create. If there is no maximum, -1 is returned (default).
Maximum number of different keys, or -1 if unbounded.