Esempio n. 1
0
  /**
   * Make this transport as up and running.
   *
   * <p>When this method is called, all the services are already registered with the peergroup. So
   * we do not need to delay binding any further. All the public methods, which could be called
   * between init and startApp are defensive regarding the services possibly not being there.
   */
  public int startApp(String[] arg) {

    resolver = group.getResolverService();
    membership = group.getMembershipService();

    if (null == resolver) {
      if (LOG.isEnabledFor(Level.DEBUG)) {
        LOG.debug("Endpoint Router start stalled until resolver service available");
      }
      return Module.START_AGAIN_STALLED;
    }

    if (null == membership) {
      if (LOG.isEnabledFor(Level.DEBUG)) {
        LOG.debug("Endpoint Router start stalled until membership service available");
      }
      return Module.START_AGAIN_STALLED;
    }

    resolver.registerHandler(routerSName, this);
    // create and register the srdi service
    srdiIndex = new SrdiIndex(group, srdiIndexerFileName);
    // Srdi is a thread but we are not going to start,
    // since the service is reactive.
    srdi = new Srdi(group, routerSName, this, srdiIndex, 0, 0);
    resolver.registerSrdiHandler(routerSName, this);

    // obtain credential for resolver messages
    try {
      // FIXME 20041008 bondolo this needs to be converted to dynamically managing credentials.

      // get the only credential "nobody"
      credential = (Credential) membership.getDefaultCredential();
      if (null != credential) {
        credentialDoc = credential.getDocument(MimeMediaType.XMLUTF8);
      }
    } catch (Exception e) {
      if (LOG.isEnabledFor(Level.ERROR)) {
        LOG.error("failed to get credential", e);
      }
    }

    // get the RouteCM cache service
    routeCM = router.getRouteCM();

    return 0;
  }
Esempio n. 2
0
  /**
   * 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);
      }
    }
  }