public void setVertex_ServiceComment(String host, StatServiceComment servicecomment) {
Vertex v = getVertex(host);
if (v != null) {
Map <String, LinkedList<StatServiceComment>> servicescomment = (Map<String, LinkedList<StatServiceComment>>)v.getUserDatum("servicescomment");
if (servicescomment == null) { /* initializes the userdatum key */
v.addUserDatum("servicescomment", new HashMap<String, LinkedList<StatServiceComment>>(), UserData.REMOVE);
servicescomment = (Map<String, LinkedList<StatServiceComment>>)v.getUserDatum("servicescomment");
}
/* create a new linked list for the service */
if (!servicescomment.containsKey(servicecomment.getServiceDescription())) {