public List<PublishedItem> getPublishedItems(int recentItems) {
        return Collections.emptyList();
    }
Returns a list of {@link PublishedItem} with the most recent N items published to
the node. The returned collection cannot be modified. Collection nodes does not
support publishing of items so an empty list will be returned in that case.

@param recentItems number of recent items to retrieve.
@return a list of PublishedItem with the most recent N items published to
        the node.
xmppserver/src/main/java/org/jivesoftware/openfire/pubsub/Node.java