/**
* cleanup any edge peers when trying to forward an SRDI query so we are guaranteed to the best of
* our knowledge that the peer is a rendezvous. This is not perfect, as it may take time for the
* peerview to converge but at least we can remove any peers that is not a rendezvous.
*/
protected Vector cleanupAnyEdges(String src, Vector results) {
Vector clean = new Vector(results.size());
PeerID pid = null;
// put the peerview as a vector of PIDs
Vector rpvId = srdi.getGlobalPeerView();
// remove any peers not in the current peerview
// these peers may be gone or have become edges
for (int i = 0; i < results.size(); i++) {
pid = (PeerID) results.elementAt(i);
// eliminate the src of the query so we don't resend
// the query to whom send it to us
if (src.equals(pid.toString())) {
continue;
}
// remove the local also, so we don't send to ourself
if (localPeerId.equals(pid)) {
continue;
}
if (rpvId.contains(pid)) { // ok that's a good RDV to the best
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("valid rdv for SRDI forward " + pid);
}
clean.add(pid);
} else {
// cleanup our SRDI cache for that peer
srdiIndex.remove(pid);
}
}
return clean;
}
/**
* remove a SRDI cache entry
*
* @param peer peer id we send the request, null for sending to all
* @param id peer id of the SRDI route that we want to remove from the cache
*/
protected void removeSrdi(String peer, PeerID id) {
SrdiMessage srdiMsg;
try {
srdiMsg =
new SrdiMessageImpl(
group.getPeerID(),
1, // only one hop
"route",
id.toString(),
null, // 0 means remove
new Long(0).longValue());
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("sending a router SRDI message delete route " + id);
}
if (peer == null) {
PeerID destPeer = srdi.getReplicaPeer(id.toString());
// don't push anywhere if we do not have replica
// or we are trying to push to ouself
if (destPeer != null && (!destPeer.equals(localPeerId))) {
srdi.pushSrdi(destPeer, srdiMsg);
}
}
} catch (Exception e) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("Removing srdi entry failed", e);
}
}
}
/*
* push all srdi entries to the rednezvous SRDI cache (new connection)
*@param all if true push all entries, otherwise just deltas
*/
protected void pushSrdi(String peer, boolean all) {
SrdiMessage srdiMsg;
Vector routeIx = new Vector();
// 10182002tra:Route info don't expire unless the peer disappears
// This approach is used to limit the SRDI traffic. The key
// point here is that SRDI is used to tell a peer that another
// has a route to the destination it is looking for. The information
// that SRDI cache is not so much the specific route info but rather
// the fact that a peer has knowledge of a route to another peer
// We don't want to update the SRDI cache on every route update.
// The SRDI cache will be flushed when the peer disconnect from
// the rendezvous.
// We cannot support concurrent modification of the map while we
// do that: we must synchronize...
for (Iterator each = router.getAllRoutedRouteAddresses(); each.hasNext(); ) {
PeerID pid = router.addr2pid((EndpointAddress) each.next());
SrdiMessage.Entry entry = new SrdiMessage.Entry(pid.toString(), "", Long.MAX_VALUE);
routeIx.addElement(entry);
}
try {
// check if we have anything to send
if (routeIx.size() == 0) {
return;
}
srdiMsg =
new SrdiMessageImpl(
group.getPeerID(),
1, // one hop
"route",
routeIx);
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("Sending a SRDI messsage of [All=" + all + "] routes");
}
// this will replicate entry to the SRDI replica peers
srdi.replicateEntries(srdiMsg);
} catch (Exception e) {
if (LOG.isEnabledFor(Level.WARN)) {
LOG.warn("SRDI Push failed", e);
}
}
}
/*
* push srdi entries to the SRDI rendezvous cache
* @param all if true push all entries, otherwise just deltas
*/
protected void pushSrdi(ID peer, PeerID id) {
SrdiMessage srdiMsg;
try {
srdiMsg =
new SrdiMessageImpl(
group.getPeerID(),
1, // only one hop
"route",
id.toString(),
null,
new Long(Long.MAX_VALUE).longValue()); // maximum expiration
// 10182002tra:Route info don't expire unless the peer disappears
// This approach is used to limit the SRDI traffic. The key
// point here is that SRDI is used to tell a peer that another
// has a route to the destination it is looking for. The information
// that SRDI cache is not so much the specific route info but rather
// the fact that a peer has knowledge of a route to another peer
// We don't want to update the SRDI cache on every route update.
// The SRDI cache will be flushed when the peer disconnect from
// the rendezvous.
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("sending a router SRDI message add route " + id);
}
if (peer == null) {
PeerID destPeer = srdi.getReplicaPeer(id.toString());
peer = destPeer;
}
// don't push anywhere if we do not have a replica
// or we are trying to send the query to ourself
if (!localPeerId.equals(peer)) {
srdi.pushSrdi(peer, srdiMsg);
}
} catch (Exception e) {
if (LOG.isEnabledFor(Level.WARN)) {
LOG.warn("SRDI push failed", e);
}
}
}
/**
* Create a new blocking output pipe
*
* @param group The peergroup context.
* @param pAdv advertisement for the pipe we are supporting.
* @param peerID the destination <code>PeerID</code>.
* @param route the destination route.
* @throws IOException for failures creating a pipe to the destination peer.
*/
public BlockingWireOutputPipe(
PeerGroup group, PipeAdvertisement pAdv, PeerID peerID, RouteAdvertisement route)
throws IOException {
this.pAdv = pAdv;
this.group = group;
this.endpoint = group.getEndpointService();
destination =
new EndpointAddress(
"jxta", peerID.getUniqueValue().toString(), "PipeService", pAdv.getID().toString());
this.route = route;
checkMessenger();
if (Logging.SHOW_INFO && LOG.isLoggable(Level.INFO)) {
LOG.info("Created output pipe for " + getPipeID());
}
}
public void serializeTo(Element element) throws DocumentSerializationException {
if (peerID != null) {
DocumentSerializableUtilities.addString(element, "peerID", peerID.toString());
}
if (state != null) {
DocumentSerializableUtilities.addString(element, "state", state);
}
if (transitionTime != 0) {
DocumentSerializableUtilities.addLong(element, "transitionTime", transitionTime);
}
if (lastLeaseRenewalTime != 0) {
DocumentSerializableUtilities.addLong(element, "lastLeaseRenewalTime", lastLeaseRenewalTime);
}
if (lease != 0) {
DocumentSerializableUtilities.addLong(element, "lease", lease);
}
if (numConnects != 0) {
DocumentSerializableUtilities.addInt(element, "numConnects", numConnects);
}
if (numLeaseRenewals != 0) {
DocumentSerializableUtilities.addInt(element, "numLeaseRenewals", numLeaseRenewals);
}
if (numDisconnects != 0) {
DocumentSerializableUtilities.addInt(element, "numDisconnects", numDisconnects);
}
if (numConnectionsRefused != 0) {
DocumentSerializableUtilities.addInt(element, "numConnectionsRefused", numConnectionsRefused);
}
if (numErrorsAddingClient != 0) {
DocumentSerializableUtilities.addInt(element, "numErrorsAddingClient", numErrorsAddingClient);
}
if (numUnableToRespondToConnectRequest != 0) {
DocumentSerializableUtilities.addInt(
element, "numUnableToRespondToConnectRequest", numUnableToRespondToConnectRequest);
}
if (totalTimeConnected != 0) {
DocumentSerializableUtilities.addLong(element, "totalTimeConnected", totalTimeConnected);
}
}
/**
* Process the Query, and generate response
*
* @param query the query to process
*/
public int processQuery(ResolverQueryMsg query) {
if (!useRouteResolver) { // Route resolver disabled
return ResolverService.OK;
}
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("processQuery starts");
}
RouteQuery routeQuery = null;
Reader ip = null;
try {
ip = new StringReader(query.getQuery());
StructuredTextDocument asDoc =
(StructuredTextDocument)
StructuredDocumentFactory.newStructuredDocument(MimeMediaType.XMLUTF8, ip);
routeQuery = new RouteQuery(asDoc);
} catch (Throwable e) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("Malformed Route query ", e);
}
return ResolverService.OK;
} finally {
try {
if (null != ip) {
ip.close();
ip = null;
}
} catch (Throwable ignored) {;
}
}
PeerID pId = routeQuery.getDestPeerID();
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("processQuery: looking for route to " + pId);
}
RouteAdvertisement srcRoute = routeQuery.getSrcRoute();
List badHops = routeQuery.getBadHops();
if (LOG.isEnabledFor(Level.DEBUG)) {
if (badHops != null) {
LOG.debug("processQuery: bad Hops");
for (int i = 0; i < badHops.size(); i++) {
LOG.debug("processQuery: :" + ((PeerID) badHops.get(i)).toString());
}
}
}
// if our source route is not null, then publish it
if (srcRoute != null) {
if (!(srcRoute.getDestPeerID()).equals(localPeerId)) {
// This is not our own peer adv so we must not keep it
// longer than its expiration time.
try {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("processQuery: publishing sender route info " + srcRoute.getDestPeerID());
}
// 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())))) {
routeCM.publishRoute(srcRoute);
}
} catch (Exception e) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("Could not publish Route Adv from query - discard", e);
}
return ResolverService.OK;
}
}
} else {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("No src Route in route query - discard ");
}
return ResolverService.OK;
}
if (pId == null) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("Malformed route query request, no PeerId - discard");
}
return ResolverService.OK;
}
// We have more luck with that one because, since it is part of OUR
// message, and not part of the resolver protocol, it is in OUR
// format.
EndpointAddress qReqAddr = router.pid2addr(pId);
RouteAdvertisement route = null;
// check if this peer has a route to the destination
// requested
boolean found = false;
if (qReqAddr.equals(localPeerAddr)) {
found = true;
// return the route that is my local route
route = router.getMyLocalRoute();
} else {
// only rendezvous can respond to route requests
// if not we are generating too much traffic
// XXX: here is where we could be more conservative and use isNormallyReachable() instead,
// thus excluding
// incoming messengers.
if (router.isLocalRoute(qReqAddr)) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("processQuery: peer has direct route to destination ");
}
// we should set the route to something :-)
found = true;
// this peer has a direct route to the destination
// return the short route advertisement we know for this peer
// (For us it is zero hop, and we advertise ourself as the routing
// peer in the response. The stiching is done by whoever gets that
// response). May be there are more than one hop advertised in-there...
// alternate routing peers...should we leave them ?
// For now, we keep the full dest, but wack the hops.
route =
(RouteAdvertisement)
AdvertisementFactory.newAdvertisement(RouteAdvertisement.getAdvertisementType());
AccessPointAdvertisement ap =
(AccessPointAdvertisement)
AdvertisementFactory.newAdvertisement(
AccessPointAdvertisement.getAdvertisementType());
ap.setPeerID(pId);
route.setDest(ap);
} else {
route = router.getRoute(qReqAddr, false);
if (route != null) {
found = true;
// check if we were given some bad hops info
// and see if the found route contains
// any of these bad hops. In that case, we need
// to mark this route as bad
for (int i = 0; i < badHops.size(); i++) {
// destination is known to be bad
if (router.addr2pid(qReqAddr).equals(((PeerID) badHops.get(i)))) {
processBadRoute((PeerID) badHops.get(i), route);
found = false;
break;
}
if (route.containsHop((PeerID) badHops.get(i))) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug(
"processQuery: peer has bad route due to "
+ ((PeerID) badHops.get(i)).toString());
}
processBadRoute((PeerID) badHops.get(i), route);
found = false;
break;
}
}
}
}
}
if (!found) {
// discard the request if we are not a rendezvous
// else forward to the next peers
if (!group.isRendezvous()) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("discard query forwarding as not a rendezvous");
}
return ResolverService.OK;
}
// did not find a route, check our srdi cache
// make sure we protect against out of sync
// SRDI index
// srdi forwarding is only involved once the Index entry has
// been found and we forwarded the resolver query. Afterward a
// normal walk proceeds from the initial SRDI index pointing
// rdv. This is done to protect against potential loopback
// entries in the SRDI cache index due to out of sync peerview
// and index.
if (query.getHopCount() < 2) {
// check local SRDI cache to see if we have the entry
// we look for 10 entries, will pickup one randomly
Vector results = srdiIndex.query("route", "DstPID", pId.toString(), 10);
if (results.size() > 0) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("processQuery srdiIndex lookup match :" + results.size());
}
// remove any non-rdv peers to avoid sending
// to a non-rdv peers and garbage collect the SRDI
// index in the process
Vector clean = cleanupAnyEdges(query.getSrc(), results);
if (clean.size() > 0) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("found an srdi entry forwarding query to SRDI peer");
}
// The purpose of incrementing the hopcount
// when an SRDI index match is found (we got a
// pointer to a rdv that should have the route) is to
// restrict any further forwarding. The increment
// count is only done when a matching SRDI index is
// found. Not when the replica is selected as we
// still need to forward the query. This restriction
// is purposelly done to avoid too many longjumps
// within a walk.
query.incrementHopCount();
// Note: this forwards the query to 1 peer randomly
// selected from the result
srdi.forwardQuery(clean, query, 1);
// tell the resolver no further action is needed.
return ResolverService.OK;
}
}
}
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("did not find a route or SRDI index");
}
// force a walk
return ResolverService.Repropagate;
}
// we found a route send the response
try {
if (route == null) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("we should have had a route at this point");
}
return ResolverService.OK;
}
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("processQuery: we have a route build route response" + route.display());
}
RouteAdvertisement myRoute = router.getMyLocalRoute();
// make sure we initialized our local
// route info as we will need it to respond. We may
// not have our route if we are still
// waiting for a relay connection.
if (myRoute == null) {
return ResolverService.OK;
}
RouteResponse routeResponse = new RouteResponse();
routeResponse.setDestRoute(route);
routeResponse.setSrcRoute(myRoute);
if (routeResponse == null) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("error creating route response");
}
return ResolverService.OK;
}
// construct a response from the query
ResolverResponseMsg res = query.makeResponse();
res.setCredential(credentialDoc);
res.setResponse(routeResponse.toString());
resolver.sendResponse(query.getSrc(), res);
return ResolverService.OK;
} catch (Exception ee) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("processQuery: error while processing query ", ee);
}
return ResolverService.OK;
}
}
/**
* bad route, so let's remove everything we have so we can start from scratch. We are maintaining
* a bad route up to DEFAULT_ROUTE experition after that we consider it to be ok to retry the same
* route We are removing both the route and peer advertisement to force a new route query
*
* @param src peer that reply with the NACK route info
* @param dest original route information
*/
private void processBadRoute(PeerID badHop, RouteAdvertisement dest) {
EndpointAddress addr = router.pid2addr(dest.getDestPeerID());
if (addr == null) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("remove bad route has a bad route info - discard");
}
return;
}
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("remove bad route info for dest " + dest.display());
if (badHop != null) {
LOG.debug("remove bad route bad hop " + badHop);
}
}
try {
// check first that we still have the same route, we may already
// using a new route
RouteAdvertisement currentRoute = router.getRoute(addr, false);
if (currentRoute == null) { // we already cleanup the route info
return;
}
// check if we still have the old bad route, we may have
// already updated the route
if (!currentRoute.equals(dest)) {
// check if the bad hop is not the destination
// if it is then we still have a bad route
if (!(badHop.equals(router.addr2pid(addr)))) {
// check if the new route may still contain the bad hop
// the known bad hop is the hop after the src peer that
// responded with a NACK route
// In this case we also consider the route bad
if (badHop != null) { // this should really not be null
if (!currentRoute.containsHop(badHop)) {
return; // we are ok
} else {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("current route is bad because it contains known bad hop" + badHop);
}
}
} else { // we could get the bad hop, so consider the route ok
return;
}
} else {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("current route is bad because it contains known bad destination" + badHop);
}
}
}
// keep the bad one in a cache table so we don't retry them
// right away. We use the default route timeout
BadRoute badRoute = ((BadRoute) router.getBadRoute(addr));
if (badRoute != null) {
Long nextTry = badRoute.getExpiration();
if (nextTry.longValue()
> System.currentTimeMillis()) { // nothing to do the information is still valid
} else {
// It is ancient knowlege update it
nextTry = new Long(TimeUtils.toAbsoluteTimeMillis(BADROUTE_EXPIRATION));
badRoute.setExpiration(nextTry);
}
List badHops = badRoute.getHops();
// check if we have to add a new bad hop
// to our bad route
if (badHop != null) {
if (!badHops.contains(badHop)) {
badHops.add(badHop);
// new expiration
nextTry = new Long(TimeUtils.toAbsoluteTimeMillis(BADROUTE_EXPIRATION));
badRoute.setHops(badHops);
badRoute.setExpiration(nextTry);
}
}
router.setBadRoute(addr, badRoute);
return;
} else {
// create a new NACK route entry
Vector badHops = new Vector();
if (badHop != null) {
badHops.add(badHop);
}
badRoute =
new BadRoute(
dest, new Long(TimeUtils.toAbsoluteTimeMillis(BADROUTE_EXPIRATION)), badHops);
router.setBadRoute(addr, badRoute);
}
// remove route from route CM
routeCM.flushRoute(addr);
// let's remove the remote route info from the routing table
// we do this after we removed the entries from the CM
// to avoid that another thread is putting back the entry
router.removeRoute(addr);
} catch (Exception ex) {
if (LOG.isEnabledFor(Level.WARN)) {
LOG.warn("exception during bad route removal", ex);
}
}
}
/**
* issue a new route discovery resolver request
*
* @param peer the destination as a logical enpoint address
*/
protected void findRoute(EndpointAddress peer) {
RouteAdvertisement myRoute = router.getMyLocalRoute();
// No need to pursue further if we haven't
// initialize our own route as responding
// peers are not going to be able to respond to us.
if (myRoute == null) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("Cannot issue a find route if we don't know our own route");
}
return;
}
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("Find route for peer = " + peer);
}
try {
// create a new RouteQuery message
RouteQuery doc = null;
// check if we have some bad route information
// for that peer, in that case pass the bad hop count
BadRoute badRoute;
badRoute = (BadRoute) router.getBadRoute(peer);
if (badRoute != null) {
// ok we have a bad route
// pass the bad hops info as part of the query
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("findRoute sends query: known bad Hops" + badRoute.display());
}
doc = new RouteQuery(router.addr2pid(peer), myRoute, badRoute.getHops());
} else {
doc = new RouteQuery(router.addr2pid(peer), myRoute, null);
}
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("Sending query for peer : " + peer);
}
ResolverQuery query =
new ResolverQuery(
routerSName, credentialDoc, localPeerId.toString(), doc.toString(), qid++);
// only run SRDI if we are a rendezvous
if (group.isRendezvous()) {
// check where to send the query via SRDI
Vector results = null;
if (srdiIndex != null) {
// try to find a least 10 entries, will pick up one
// randomly. This will protect against retry. It is
// likely that a number of RDV will know about a route
results = srdiIndex.query("route", "DstPID", router.addr2pid(peer).toString(), 10);
if (results != null && results.size() > 0) {
// use SRDI to send the query
// remove any non rdv peers from the candidate list
// and garbage collect the index in the process
Vector clean = cleanupAnyEdges(query.getSrc(), results);
if (clean.size() > 0) {
// The purpose of incrementing the hopcount
// when an SRDI index match is found (we got a
// pointer to a rdv that should have the route) is to
// restrict any further forwarding. The increment
// count is only done when a matching SRDI index is
// found. Not when the replica is selected as we
// still need to forward the query. This restriction
// is purposelly done to avoid too many longjumps
// within a walk.
query.incrementHopCount();
srdi.forwardQuery(clean, query, 1);
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("found an srdi entry forwarding query to SRDI peer");
}
return;
}
} else {
// it is not in our cache, look for the replica peer
// we need to send the query
PeerID destPeer = srdi.getReplicaPeer(router.addr2pid(peer).toString());
if (destPeer != null && !destPeer.equals(localPeerId)) {
// don't push anywhere if we do not have a replica
// or we are trying to push to ourself
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("processQuery srdiIndex DHT forward :" + destPeer);
}
srdi.forwardQuery(destPeer.toString(), query);
return;
}
}
}
}
// if we reach that point then we just use the resolver walk
resolver = group.getResolverService();
if (resolver != null) {
resolver.sendQuery(null, query);
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("find route query sent");
}
} else {
if (LOG.isEnabledFor(Level.WARN)) {
LOG.warn("cannot get the resolver service");
}
}
} catch (Exception ee) {
if (LOG.isEnabledFor(Level.WARN)) {
LOG.warn("Exception in findRoute", ee);
}
}
}
/**
* process an SRDI message request
*
* @param message SRDI resolver message
*/
public boolean processSrdi(ResolverSrdiMsg message) {
String value;
SrdiMessage srdiMsg;
try {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("Received a SRDI messsage in group" + group.getPeerGroupName());
}
XMLDocument asDoc =
(XMLDocument)
StructuredDocumentFactory.newStructuredDocument(
MimeMediaType.XMLUTF8, new StringReader(message.getPayload()));
srdiMsg = new SrdiMessageImpl(asDoc);
} catch (Exception e) {
// we don't understand this msg, let's skip it
if (LOG.isEnabledFor(Level.WARN)) {
LOG.warn("corrupted SRDI message", e);
}
return false;
}
PeerID pid = srdiMsg.getPeerID();
// filter messages that contain messages
// about the local peer, so we don't enter
// self-reference
if (pid.equals(localPeerId)) {
return false;
}
Iterator eachEntry = srdiMsg.getEntries().iterator();
while (eachEntry.hasNext()) {
SrdiMessage.Entry entry = (SrdiMessage.Entry) eachEntry.next();
// drop any information about ourself
if (entry.key.equals(localPeerId.toString())) {
continue;
}
value = entry.value;
if (value == null) {
value = "";
}
// Expiration of entries is taken care of by SrdiIdex, so we always add
// FIXME hamada 03142003
// All routes are added under the secondary key 'DstPID', it would be more correct to
// Specify it in the message, but since versioning is not yet supported the following is
// acceptable, since it is localized
srdiIndex.add(srdiMsg.getPrimaryKey(), "DstPID", entry.key, pid, entry.expiration);
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug(
"Primary Key ["
+ srdiMsg.getPrimaryKey()
+ "] key [DstPID]"
+ " value ["
+ entry.key
+ "] exp ["
+ entry.expiration
+ "]");
}
}
return true;
}
/**
* Return a route error in case a route was found to be invalid as the current hop cannot find a
* way to forward the message to the destination or any other hops in the forward part of the
* route. In that case a negative route response is forwarded to the orginal source of the
* message. Now of course we do not have any way to guarantee that the NACK message will be
* received by the sender, but the best we can do is to try :-)
*
* <p>we send a query ID to NACKROUTE_QUERYID to indicate this is a bad Route
*
* @param src original source of the message
* @param dest original destination of the message
*/
protected void generateNACKRoute(PeerID src, PeerID dest, Vector origHops) {
// As long as the group is partially initialized, do not bother
// trying to send NACKS. We can't: it just causes NPEs.
if (resolver == null) {
return;
}
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("generate NACK Route response " + src);
}
// check first, if we are not already in process of looking for a
// route to the destination peer of the NACK. We should not try to
// send a NACK to that destination at that point as this will block
// our incoming processing thread while it is looking for a route to
// that destination. If there a no pending route requests to that
// destination then we can go ahead an attempt to send the NACK. At
// the maximum we should have only one thread block while looking for
// a specific destination. When we find a route to the destination,
// the next NACK processing will be sent.
if (router.isPendingRouteQuery(router.pid2addr(src))) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("drop NACK due to pending route discovery " + src);
}
return;
}
// Generate a route response
RouteAdvertisement route =
(RouteAdvertisement)
AdvertisementFactory.newAdvertisement(RouteAdvertisement.getAdvertisementType());
AccessPointAdvertisement ap =
(AccessPointAdvertisement)
AdvertisementFactory.newAdvertisement(AccessPointAdvertisement.getAdvertisementType());
ap.setPeerID(dest);
route.setDest(ap);
route.setHops(origHops);
// set the the route of the peer that
// detected the bad route
RouteAdvertisement routeSrc =
(RouteAdvertisement)
AdvertisementFactory.newAdvertisement(RouteAdvertisement.getAdvertisementType());
AccessPointAdvertisement apSrc =
(AccessPointAdvertisement)
AdvertisementFactory.newAdvertisement(AccessPointAdvertisement.getAdvertisementType());
apSrc.setPeerID((PeerID) localPeerId);
routeSrc.setDest(apSrc);
RouteResponse routeResponse = new RouteResponse();
routeResponse.setDestRoute(route);
routeResponse.setSrcRoute(routeSrc);
if (routeResponse == null) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("error creating route NACKresponse");
}
return;
}
ResolverResponse res =
new ResolverResponse(
routerSName,
credentialDoc,
NACKROUTE_QUERYID, // mean NACKRoute
routeResponse.toString());
// send the NACK response back to the originator
resolver.sendResponse(src.toString(), res);
}
public static void main(String[] args) {
try {
// Removing any existing configuration?
Tools.CheckForExistingConfigurationDeletion(Name, ConfigurationFile);
// Creation of network manager
NetworkManager MyNetworkManager =
new NetworkManager(NetworkManager.ConfigMode.EDGE, Name, ConfigurationFile.toURI());
// Retrieving the network configurator
NetworkConfigurator MyNetworkConfigurator = MyNetworkManager.getConfigurator();
// Checking if RendezVous_Adelaide_At_One_End should be a seed
MyNetworkConfigurator.clearRendezvousSeeds();
String TheSeed =
"tcp://"
+ InetAddress.getLocalHost().getHostAddress()
+ ":"
+ RendezVous_Adelaide_At_One_End.TcpPort;
Tools.CheckForRendezVousSeedAddition(Name, TheSeed, MyNetworkConfigurator);
// Setting Configuration
MyNetworkConfigurator.setTcpPort(TcpPort);
MyNetworkConfigurator.setTcpEnabled(true);
MyNetworkConfigurator.setTcpIncoming(true);
MyNetworkConfigurator.setTcpOutgoing(true);
// Setting the Peer ID
Tools.PopInformationMessage(Name, "Setting the peer ID to :\n\n" + PID.toString());
MyNetworkConfigurator.setPeerID(PID);
// Starting the JXTA network
Tools.PopInformationMessage(
Name,
"Start the JXTA network and to wait for a rendezvous connection with\n"
+ RendezVous_Adelaide_At_One_End.Name
+ " for maximum 2 minutes");
PeerGroup NetPeerGroup = MyNetworkManager.startNetwork();
// Disabling any rendezvous autostart
NetPeerGroup.getRendezVousService().setAutoStart(false);
if (MyNetworkManager.waitForRendezvousConnection(120000)) {
Tools.popConnectedRendezvous(NetPeerGroup.getRendezVousService(), Name);
} else {
Tools.PopInformationMessage(Name, "Did not connect to a rendezvous");
}
// Preparing the listener and Creating the BiDiPipe
PipeMsgListener MyListener = new Edge_Quinisela_At_The_Other_End();
JxtaBiDiPipe MyBiDiPipe =
new JxtaBiDiPipe(
NetPeerGroup,
RendezVous_Adelaide_At_One_End.GetPipeAdvertisement(),
30000,
MyListener);
if (MyBiDiPipe.isBound()) {
Tools.PopInformationMessage(Name, "Bidirectional pipe created!");
// Sending a hello message !!!
Message MyMessage = new Message();
StringMessageElement MyStringMessageElement =
new StringMessageElement("HelloElement", "Hello from " + Name, null);
MyMessage.addMessageElement("DummyNameSpace", MyStringMessageElement);
MyBiDiPipe.sendMessage(MyMessage);
// Sleeping for 10 seconds
Tools.GoToSleep(10000);
// Sending a goodbye message !!!
MyMessage = new Message();
MyStringMessageElement =
new StringMessageElement("HelloElement", "Goodbye from " + Name, null);
MyMessage.addMessageElement("DummyNameSpace", MyStringMessageElement);
MyBiDiPipe.sendMessage(MyMessage);
// Sleeping for 10 seconds
Tools.GoToSleep(10000);
}
// Closing the bidipipe
MyBiDiPipe.close();
// Stopping the network
Tools.PopInformationMessage(Name, "Stop the JXTA network");
MyNetworkManager.stopNetwork();
} catch (IOException Ex) {
// Raised when access to local file and directories caused an error
Tools.PopErrorMessage(Name, Ex.toString());
} catch (PeerGroupException Ex) {
// Raised when the net peer group could not be created
Tools.PopErrorMessage(Name, Ex.toString());
}
}
/**
* {@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;
}
