This class represents everything we need to know about a document that's getting passed from the
getDocumentVersions() phase to the processDocuments() phase.
This method is periodically called for all connectors that are connected but not
in active use.
poolLock -
Static variable in class org.apache.manifoldcf.crawler.connectors.webcrawler.ThrottledFetcher
This global lock protects the "distributed pool" resource, and insures that a connection
can get pulled out of all the right pools and wind up in only the hands of one thread.