public Node.UniqueIdentifier getUniqueNodeIdentifier() {
        return uniqueNodeIdentifier;
    }
Returns the unique identifier of the pubsub node that this task aims to update.

Usage of this method, that provides a system-wide unique value, should generally be preferred over the use of
{@link #getNodeId()}, that returns a value that is unique only context of the pubsub service.

@return A unique node identifier.
@see Node#getUniqueIdentifier()
xmppserver/src/main/java/org/jivesoftware/openfire/pubsub/cluster/NodeTask.java