/**
* {@inheritDoc}
*
* <p>This is called by the Generic ResolverServiceImpl when processing a response to a query.
*/
public void processResponse(ResolverResponseMsg response) {
if (!useRouteResolver) { // Route resolver disabled
return;
}
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("processResponse got a response");
}
// convert the response into a RouteResponse
Reader ip = null;
RouteResponse doc = null;
try {
ip = new StringReader(response.getResponse());
StructuredTextDocument asDoc =
(StructuredTextDocument)
StructuredDocumentFactory.newStructuredDocument(MimeMediaType.XMLUTF8, ip);
doc = new RouteResponse(asDoc);
} catch (Throwable e) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("processResponse: malformed response - discard", e);
}
return;
} finally {
try {
if (null != ip) {
ip.close();
ip = null;
}
} catch (Throwable ignored) {
}
}
RouteAdvertisement dstRoute = doc.getDestRoute();
RouteAdvertisement srcRoute = doc.getSrcRoute();
int queryId = response.getQueryId();
if ((dstRoute == null) || (srcRoute == null)) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("processResponse: malformed response - discard.");
}
// Malformed response. Just discard.
return;
}
EndpointAddress routingPeer = router.pid2addr(srcRoute.getDestPeerID());
EndpointAddress destPeer = router.pid2addr(dstRoute.getDestPeerID());
if ((routingPeer == null) || (destPeer == null)) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("processResponse: malformed PeerID in response - discard.");
}
// Malformed response. Just discard.
return;
}
// check if we have a negative route response
if (queryId == NACKROUTE_QUERYID) {
AccessPointAdvertisement badHop = dstRoute.nextHop(router.addr2pid(routingPeer));
PeerID badPeer = null;
if (badHop != null) {
badPeer = badHop.getPeerID();
} else { // the bad hop is the final destination
badPeer = dstRoute.getDestPeerID();
}
processBadRoute(badPeer, dstRoute);
return;
}
// This is not our own peer adv, so we must not keep it
// for more than its expiration time.
// we only need to publish this route if
// we don't know about it yet
// XXX: here is where we could be more conservative and use isNormallyReachable() instead, thus
// excluding
// incoming messengers.
if ((!router.isLocalRoute(router.pid2addr(srcRoute.getDestPeerID())))
&& (!router.isRoutedRoute(router.pid2addr(srcRoute.getDestPeerID())))) {
router.updateRouteAdv(srcRoute);
}
if (destPeer.equals(routingPeer)) {
// The dest peer itself managed to respond to us. That means we
// learned the route from the reverseRoute in the message
// itself. So, there's nothing we need to do.
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("learn route directly from the destination");
}
} else {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("learn route:" + routingPeer);
}
try {
// build the candidate route using the
// route response from the respondant peer
RouteAdvertisement candidateRoute =
RouteAdvertisement.newRoute(
router.addr2pid(destPeer),
router.addr2pid(routingPeer),
(Vector) dstRoute.getVectorHops().clone());
// cleanup the candidate route from any loop and remove the local peer extra
// cycle
RouteAdvertisement.cleanupLoop(candidateRoute, (PeerID) localPeerId);
// Is there anything left in that route (or did the respondant
// believe that we are the last hop on the route - which
// obviously we are not.
if (candidateRoute.size() == 0) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("Route response outdated: NACK responder");
}
generateNACKRoute(
router.addr2pid(routingPeer), router.addr2pid(destPeer), dstRoute.getVectorHops());
return;
}
// get the address of the first hop in the route to verify that
// we have a route (direct or long) to the first hop, so the route
// is valid
EndpointAddress candidateRouter = router.pid2addr(candidateRoute.getFirstHop().getPeerID());
// check that we have a direct connection to the first hop
if (router.ensureLocalRoute(candidateRouter, null) == null) {
// If we do not have a direct route to the candidate router check
// for a long route in that case stich the route
RouteAdvertisement routeToRouter = router.getRoute(candidateRouter, false);
if (routeToRouter == null) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("Route response useless: no route to next router hop");
}
return;
}
// stich the route removing any loops and localPeer cycle
if (RouteAdvertisement.stichRoute(candidateRoute, routeToRouter, (PeerID) localPeerId)) {
router.setRoute(candidateRoute, false);
} else {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("Route response error stiching route response");
}
return;
}
} else {
// we have a direct connection with the first hop of the candidate route
// set the new route, which starts with the peer that replied to us.
router.setRoute(candidateRoute, false);
}
} catch (Exception ex) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("Route response exception when building response route" + ex);
LOG.debug(" bad dstRoute: " + dstRoute.display());
}
}
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("finish process route response successfully");
}
}
}
/**
* {@inheritDoc}
*
* @param encodeAs Description of the Parameter
* @return The document value
*/
public Document getDocument(MimeMediaType encodeAs) {
StructuredDocument adv = (StructuredDocument) super.getDocument(encodeAs);
if (hasALoop()) {
throw new IllegalStateException("I won't write a doc for a route with a loop");
}
PeerID pid = getDestPeerID();
AccessPointAdvertisement dest = getDest();
if ((null != pid) && (null != dest) && (null != dest.getPeerID())) {
if (!pid.equals(dest.getPeerID())) {
throw new IllegalStateException(
"Destination peer id and destination access point adv don't refer to the same peer");
}
}
// HACK Backwards Compatibility
if ((null == pid) && (null != dest)) {
pid = dest.getPeerID();
}
if (pid != null) {
Element e0 = adv.createElement(DEST_PID_TAG, pid.toString());
adv.appendChild(e0);
}
if (dest != null) {
// create the copy without the PID
AccessPointAdvertisement ap =
(AccessPointAdvertisement)
AdvertisementFactory.newAdvertisement(
AccessPointAdvertisement.getAdvertisementType());
ap.setEndpointAddresses(dest.getVectorEndpointAddresses());
StructuredTextDocument xptDoc = (StructuredTextDocument) ap.getDocument(encodeAs);
Element e1 = adv.createElement("Dst");
adv.appendChild(e1);
StructuredDocumentUtils.copyElements(adv, e1, xptDoc);
}
// only include hops if we have some
if (getHops().hasMoreElements()) {
Element e2 = adv.createElement("Hops");
adv.appendChild(e2);
for (Enumeration e = getHops(); e.hasMoreElements(); ) {
AccessPointAdvertisement hop = (AccessPointAdvertisement) e.nextElement();
if (hop != null) {
StructuredTextDocument xptDoc = (StructuredTextDocument) hop.getDocument(encodeAs);
StructuredDocumentUtils.copyElements(adv, e2, xptDoc);
}
}
}
return adv;
}
