// Node DataScopes can be the first element in a path. They must
// find or make the corresponding HostDS and return that as the
// preferred parent.
@Override
protected ResourceContext preferredParent(RSS root) {
ServiceBroker sb = (ServiceBroker) root.getProperty("ServiceBroker");
AgentTopologyService ats = sb.getService(this, AgentTopologyService.class, null);
String nodename = (String) getSymbolValue(NODENAME);
String hostname = null;
if (ats != null) {
hostname = ats.getNodeHost(MessageAddress.getMessageAddress(nodename));
} else {
// AgentTopologyService not loaded. Try a direct WP
// call, even though it can give an inconsistent picture.
WhitePagesService svc = sb.getService(this, WhitePagesService.class, null);
try {
AddressEntry entry = svc.get(nodename, TOPOLOGY, -1);
if (entry == null) {
if (logger.isWarnEnabled()) {
logger.warn("Can't find host for node " + nodename);
}
} else {
hostname = entry.getURI().getHost();
}
} catch (Exception ex) {
// log this?
}
}
String[] params = {hostname == null ? UNKNOWN_HOST_IP : hostname};
ResourceNode node = new ResourceNode();
node.kind = "Host";
node.parameters = params;
ResourceNode[] path = {node};
ResourceContext parent = root.getPathContext(path);
setParent(parent);
return parent;
}
@Override
protected void initialize(ResourceContext context) {
super.initialize(context);
rt = Runtime.getRuntime();
ResourceNode node = new ResourceNode();
node.kind = "Alarm";
node.parameters = new String[0];
ResourceNode formula = new ResourceNode();
formula.kind = "FifteenSeconds";
formula.parameters = new String[0];
ResourceNode[] path = {node, formula};
DataFormula alarm = RSS.instance().getPathFormula(path);
registerDependency(alarm, "Alarm");
}