core/src/main/java/com/digitalpebble/stormcrawler/spout/MemorySpout.java
public static void add(String url, Metadata md, Date nextFetch) {
        LOG.debug("Adding {} with md {} and nextFetch {}", url, md, nextFetch);
        ScheduledURL tuple = new ScheduledURL(url, md, nextFetch);
        synchronized (queue) {
            queue.add(tuple);
        }
    }
public static void add(String url, Metadata md, Date nextFetch) {
        LOG.debug("Adding {} with md {} and nextFetch {}", url, md, nextFetch);
        ScheduledURL tuple = new ScheduledURL(url, md, nextFetch);
        synchronized (queue) {
            queue.add(tuple);
        }
    }
Add a new URL

@param nextFetch