@Override
  public List<ManagedObjectReference> addHostToPodCluster(
      VmwareContext serviceContext, long dcId, Long podId, Long clusterId, String hostInventoryPath)
      throws Exception {
    ManagedObjectReference mor = null;
    if (serviceContext != null) {
      mor = serviceContext.getHostMorByPath(hostInventoryPath);
    }
    String privateTrafficLabel = null;
    privateTrafficLabel = serviceContext.getStockObject("privateTrafficLabel");
    if (privateTrafficLabel == null) {
      privateTrafficLabel = _privateNetworkVSwitchName;
    }

    if (mor != null) {
      List<ManagedObjectReference> returnedHostList = new ArrayList<ManagedObjectReference>();

      if (mor.getType().equals("ComputeResource")) {
        List<ManagedObjectReference> hosts =
            (List<ManagedObjectReference>)
                serviceContext.getVimClient().getDynamicProperty(mor, "host");
        assert (hosts != null && hosts.size() > 0);

        // For ESX host, we need to enable host firewall to allow VNC access
        HostMO hostMo = new HostMO(serviceContext, hosts.get(0));

        prepareHost(hostMo, privateTrafficLabel);
        returnedHostList.add(hosts.get(0));
        return returnedHostList;
      } else if (mor.getType().equals("ClusterComputeResource")) {
        List<ManagedObjectReference> hosts =
            (List<ManagedObjectReference>)
                serviceContext.getVimClient().getDynamicProperty(mor, "host");
        assert (hosts != null);

        if (hosts.size() > 0) {
          AboutInfo about =
              (AboutInfo)
                  (serviceContext
                      .getVimClient()
                      .getDynamicProperty(hosts.get(0), "config.product"));
          String version = about.getApiVersion();
          int maxHostsPerCluster =
              _hvCapabilitiesDao.getMaxHostsPerCluster(HypervisorType.VMware, version);
          if (hosts.size() > maxHostsPerCluster) {
            String msg =
                "Failed to add VMware cluster as size is too big, current size: "
                    + hosts.size()
                    + ", max. size: "
                    + maxHostsPerCluster;
            s_logger.error(msg);
            throw new DiscoveredWithErrorException(msg);
          }
        }

        for (ManagedObjectReference morHost : hosts) {
          // For ESX host, we need to enable host firewall to allow VNC access
          HostMO hostMo = new HostMO(serviceContext, morHost);
          prepareHost(hostMo, privateTrafficLabel);
          returnedHostList.add(morHost);
        }
        return returnedHostList;
      } else if (mor.getType().equals("HostSystem")) {
        // For ESX host, we need to enable host firewall to allow VNC access
        HostMO hostMo = new HostMO(serviceContext, mor);
        prepareHost(hostMo, privateTrafficLabel);
        returnedHostList.add(mor);
        return returnedHostList;
      } else {
        s_logger.error(
            "Unsupport host type "
                + mor.getType()
                + ":"
                + mor.getValue()
                + " from inventory path: "
                + hostInventoryPath);
        return null;
      }
    }

    s_logger.error("Unable to find host from inventory path: " + hostInventoryPath);
    return null;
  }
  @Override
  public Map<? extends ServerResource, Map<String, String>> find(
      long dcId,
      Long podId,
      Long clusterId,
      URI url,
      String username,
      String password,
      List<String> hostTags)
      throws DiscoveryException {

    if (s_logger.isInfoEnabled())
      s_logger.info(
          "Discover host. dc: "
              + dcId
              + ", pod: "
              + podId
              + ", cluster: "
              + clusterId
              + ", uri host: "
              + url.getHost());

    if (podId == null) {
      if (s_logger.isInfoEnabled())
        s_logger.info(
            "No pod is assigned, assuming that it is not for vmware and skip it to next discoverer");
      return null;
    }

    ClusterVO cluster = _clusterDao.findById(clusterId);
    if (cluster == null || cluster.getHypervisorType() != HypervisorType.VMware) {
      if (s_logger.isInfoEnabled())
        s_logger.info("invalid cluster id or cluster is not for VMware hypervisors");
      return null;
    }

    List<HostVO> hosts = _resourceMgr.listAllHostsInCluster(clusterId);
    if (hosts != null && hosts.size() > 0) {
      int maxHostsPerCluster =
          _hvCapabilitiesDao.getMaxHostsPerCluster(
              hosts.get(0).getHypervisorType(), hosts.get(0).getHypervisorVersion());
      if (hosts.size() > maxHostsPerCluster) {
        String msg =
            "VMware cluster "
                + cluster.getName()
                + " is too big to add new host now. (current configured cluster size: "
                + maxHostsPerCluster
                + ")";
        s_logger.error(msg);
        throw new DiscoveredWithErrorException(msg);
      }
    }

    String privateTrafficLabel = null;
    String publicTrafficLabel = null;
    String guestTrafficLabel = null;
    Map<String, String> vsmCredentials = null;

    VirtualSwitchType defaultVirtualSwitchType = VirtualSwitchType.StandardVirtualSwitch;

    String paramGuestVswitchType = null;
    String paramGuestVswitchName = null;
    String paramPublicVswitchType = null;
    String paramPublicVswitchName = null;

    VmwareTrafficLabel guestTrafficLabelObj = new VmwareTrafficLabel(TrafficType.Guest);
    VmwareTrafficLabel publicTrafficLabelObj = new VmwareTrafficLabel(TrafficType.Public);
    Map<String, String> clusterDetails = _clusterDetailsDao.findDetails(clusterId);
    DataCenterVO zone = _dcDao.findById(dcId);
    NetworkType zoneType = zone.getNetworkType();
    _readGlobalConfigParameters();

    // Set default physical network end points for public and guest traffic
    // Private traffic will be only on standard vSwitch for now.
    if (useDVS) {
      // Parse url parameters for type of vswitch and name of vswitch specified at cluster level
      paramGuestVswitchType = _urlParams.get(ApiConstants.VSWITCH_TYPE_GUEST_TRAFFIC);
      paramGuestVswitchName = _urlParams.get(ApiConstants.VSWITCH_NAME_GUEST_TRAFFIC);
      paramPublicVswitchType = _urlParams.get(ApiConstants.VSWITCH_TYPE_PUBLIC_TRAFFIC);
      paramPublicVswitchName = _urlParams.get(ApiConstants.VSWITCH_NAME_PUBLIC_TRAFFIC);
      defaultVirtualSwitchType = getDefaultVirtualSwitchType();
    }

    // Zone level vSwitch Type depends on zone level traffic labels
    //
    // User can override Zone wide vswitch type (for public and guest) by providing following
    // optional parameters in addClusterCmd
    // param "guestvswitchtype" with valid values vmwaredvs, vmwaresvs, nexusdvs
    // param "publicvswitchtype" with valid values vmwaredvs, vmwaresvs, nexusdvs
    //
    // Format of label is <VSWITCH>,<VLANID>,<VSWITCHTYPE>
    // If a field <VLANID> OR <VSWITCHTYPE> is not present leave it empty.
    // Ex: 1) vswitch0
    // 2) dvswitch0,200,vmwaredvs
    // 3) nexusepp0,300,nexusdvs
    // 4) vswitch1,400,vmwaresvs
    // 5) vswitch0
    // default vswitchtype is 'vmwaresvs'.
    // <VSWITCHTYPE> 'vmwaresvs' is for vmware standard vswitch
    // <VSWITCHTYPE> 'vmwaredvs' is for vmware distributed virtual switch
    // <VSWITCHTYPE> 'nexusdvs' is for cisco nexus distributed virtual switch
    // Get zone wide traffic labels for Guest traffic and Public traffic
    guestTrafficLabel = _netmgr.getDefaultGuestTrafficLabel(dcId, HypervisorType.VMware);

    // Process traffic label information provided at zone level and cluster level
    guestTrafficLabelObj =
        getTrafficInfo(
            TrafficType.Guest,
            guestTrafficLabel,
            defaultVirtualSwitchType,
            paramGuestVswitchType,
            paramGuestVswitchName,
            clusterId);

    if (zoneType == NetworkType.Advanced) {
      // Get zone wide traffic label for Public traffic
      publicTrafficLabel = _netmgr.getDefaultPublicTrafficLabel(dcId, HypervisorType.VMware);

      // Process traffic label information provided at zone level and cluster level
      publicTrafficLabelObj =
          getTrafficInfo(
              TrafficType.Public,
              publicTrafficLabel,
              defaultVirtualSwitchType,
              paramPublicVswitchType,
              paramPublicVswitchName,
              clusterId);

      // Configuration Check: A physical network cannot be shared by different types of virtual
      // switches.
      //
      // Check if different vswitch types are chosen for same physical network
      // 1. Get physical network for guest traffic - multiple networks
      // 2. Get physical network for public traffic - single network
      // See if 2 is in 1
      //  if no - pass
      //  if yes - compare publicTrafficLabelObj.getVirtualSwitchType() ==
      // guestTrafficLabelObj.getVirtualSwitchType()
      //      true  - pass
      //      false - throw exception - fail cluster add operation

      List<? extends PhysicalNetwork> pNetworkListGuestTraffic =
          _netmgr.getPhysicalNtwksSupportingTrafficType(dcId, TrafficType.Guest);
      List<? extends PhysicalNetwork> pNetworkListPublicTraffic =
          _netmgr.getPhysicalNtwksSupportingTrafficType(dcId, TrafficType.Public);
      // Public network would be on single physical network hence getting first object of the list
      // would suffice.
      PhysicalNetwork pNetworkPublic = pNetworkListPublicTraffic.get(0);
      if (pNetworkListGuestTraffic.contains(pNetworkPublic)) {
        if (publicTrafficLabelObj.getVirtualSwitchType()
            != guestTrafficLabelObj.getVirtualSwitchType()) {
          String msg =
              "Both public traffic and guest traffic is over same physical network "
                  + pNetworkPublic
                  + ". And virtual switch type chosen for each traffic is different"
                  + ". A physical network cannot be shared by different types of virtual switches.";
          s_logger.error(msg);
          throw new InvalidParameterValueException(msg);
        }
      }
    } else {
      // Distributed virtual switch is not supported in Basic zone for now.
      // Private / Management network traffic is not yet supported over distributed virtual switch.
      if (guestTrafficLabelObj.getVirtualSwitchType() != VirtualSwitchType.StandardVirtualSwitch) {
        String msg =
            "Detected that Guest traffic is over Distributed virtual switch in Basic zone. Only Standard vSwitch is supported in Basic zone.";
        s_logger.error(msg);
        throw new DiscoveredWithErrorException(msg);
      }
    }

    privateTrafficLabel = _netmgr.getDefaultManagementTrafficLabel(dcId, HypervisorType.VMware);
    if (privateTrafficLabel != null) {
      s_logger.info("Detected private network label : " + privateTrafficLabel);
    }

    if (nexusDVS) {
      if (zoneType != NetworkType.Basic) {
        publicTrafficLabel = _netmgr.getDefaultPublicTrafficLabel(dcId, HypervisorType.VMware);
        if (publicTrafficLabel != null) {
          s_logger.info("Detected public network label : " + publicTrafficLabel);
        }
      }
      // Get physical network label
      guestTrafficLabel = _netmgr.getDefaultGuestTrafficLabel(dcId, HypervisorType.VMware);
      if (guestTrafficLabel != null) {
        s_logger.info("Detected guest network label : " + guestTrafficLabel);
      }
      vsmCredentials = _vmwareMgr.getNexusVSMCredentialsByClusterId(clusterId);
    }

    VmwareContext context = null;
    try {
      context = VmwareContextFactory.create(url.getHost(), username, password);
      if (privateTrafficLabel != null)
        context.registerStockObject("privateTrafficLabel", privateTrafficLabel);

      if (nexusDVS) {
        if (vsmCredentials != null) {
          s_logger.info("Stocking credentials of Nexus VSM");
          context.registerStockObject("vsmcredentials", vsmCredentials);
        }
      }
      List<ManagedObjectReference> morHosts =
          _vmwareMgr.addHostToPodCluster(
              context, dcId, podId, clusterId, URLDecoder.decode(url.getPath()));
      if (morHosts == null) s_logger.info("Found 0 hosts.");
      if (privateTrafficLabel != null) context.uregisterStockObject("privateTrafficLabel");

      if (morHosts == null) {
        s_logger.error(
            "Unable to find host or cluster based on url: " + URLDecoder.decode(url.getPath()));
        return null;
      }

      ManagedObjectReference morCluster = null;
      clusterDetails = _clusterDetailsDao.findDetails(clusterId);
      if (clusterDetails.get("url") != null) {
        URI uriFromCluster = new URI(UriUtils.encodeURIComponent(clusterDetails.get("url")));
        morCluster = context.getHostMorByPath(URLDecoder.decode(uriFromCluster.getPath()));

        if (morCluster == null
            || !morCluster.getType().equalsIgnoreCase("ClusterComputeResource")) {
          s_logger.warn(
              "Cluster url does not point to a valid vSphere cluster, url: "
                  + clusterDetails.get("url"));
          return null;
        } else {
          ClusterMO clusterMo = new ClusterMO(context, morCluster);
          ClusterDasConfigInfo dasConfig = clusterMo.getDasConfig();
          if (dasConfig != null
              && dasConfig.isEnabled() != null
              && dasConfig.isEnabled().booleanValue()) {
            clusterDetails.put("NativeHA", "true");
            _clusterDetailsDao.persist(clusterId, clusterDetails);
          }
        }
      }

      if (!validateDiscoveredHosts(context, morCluster, morHosts)) {
        if (morCluster == null)
          s_logger.warn(
              "The discovered host is not standalone host, can not be added to a standalone cluster");
        else s_logger.warn("The discovered host does not belong to the cluster");
        return null;
      }

      Map<VmwareResource, Map<String, String>> resources =
          new HashMap<VmwareResource, Map<String, String>>();
      for (ManagedObjectReference morHost : morHosts) {
        Map<String, String> details = new HashMap<String, String>();
        Map<String, Object> params = new HashMap<String, Object>();

        HostMO hostMo = new HostMO(context, morHost);
        details.put("url", hostMo.getHostName());
        details.put("username", username);
        details.put("password", password);
        String guid = morHost.getType() + ":" + morHost.getValue() + "@" + url.getHost();
        details.put("guid", guid);

        params.put("url", hostMo.getHostName());
        params.put("username", username);
        params.put("password", password);
        params.put("zone", Long.toString(dcId));
        params.put("pod", Long.toString(podId));
        params.put("cluster", Long.toString(clusterId));
        params.put("guid", guid);
        if (privateTrafficLabel != null) {
          params.put("private.network.vswitch.name", privateTrafficLabel);
        }
        params.put("guestTrafficInfo", guestTrafficLabelObj);
        params.put("publicTrafficInfo", publicTrafficLabelObj);

        VmwareResource resource = new VmwareResource();
        try {
          resource.configure("VMware", params);
        } catch (ConfigurationException e) {
          _alertMgr.sendAlert(
              AlertManager.ALERT_TYPE_HOST,
              dcId,
              podId,
              "Unable to add " + url.getHost(),
              "Error is " + e.getMessage());
          s_logger.warn("Unable to instantiate " + url.getHost(), e);
        }
        resource.start();

        resources.put(resource, details);
      }

      // place a place holder guid derived from cluster ID
      cluster.setGuid(UUID.nameUUIDFromBytes(String.valueOf(clusterId).getBytes()).toString());
      _clusterDao.update(clusterId, cluster);

      return resources;
    } catch (DiscoveredWithErrorException e) {
      throw e;
    } catch (Exception e) {
      s_logger.warn(
          "Unable to connect to Vmware vSphere server. service address: " + url.getHost());
      return null;
    } finally {
      if (context != null) context.close();
    }
  }
  @Override
  public List<ManagedObjectReference> addHostToPodCluster(
      VmwareContext serviceContext, long dcId, Long podId, Long clusterId, String hostInventoryPath)
      throws Exception {
    ManagedObjectReference mor = serviceContext.getHostMorByPath(hostInventoryPath);
    if (mor != null) {
      List<ManagedObjectReference> returnedHostList = new ArrayList<ManagedObjectReference>();

      if (mor.getType().equals("ComputeResource")) {
        ManagedObjectReference[] hosts =
            (ManagedObjectReference[])
                serviceContext.getServiceUtil().getDynamicProperty(mor, "host");
        assert (hosts != null);

        // For ESX host, we need to enable host firewall to allow VNC access
        HostMO hostMo = new HostMO(serviceContext, hosts[0]);
        HostFirewallSystemMO firewallMo = hostMo.getHostFirewallSystemMO();
        if (firewallMo != null) {
          firewallMo.enableRuleset("vncServer");
          firewallMo.refreshFirewall();
        }

        // prepare at least one network on the vswitch to enable OVF importing
        String managementPortGroupName =
            hostMo.getPortGroupNameByNicType(HostVirtualNicType.management);
        assert (managementPortGroupName != null);
        HostPortGroupSpec spec = hostMo.getPortGroupSpec(managementPortGroupName);
        Integer vlanId = null;
        if (spec.getVlanId() != 0) {
          vlanId = spec.getVlanId();
        }

        HypervisorHostHelper.preparePrivateNetwork(
            _privateNetworkVSwitchName, hostMo, vlanId, 180000);
        returnedHostList.add(hosts[0]);
        return returnedHostList;
      } else if (mor.getType().equals("ClusterComputeResource")) {
        ManagedObjectReference[] hosts =
            (ManagedObjectReference[])
                serviceContext.getServiceUtil().getDynamicProperty(mor, "host");
        assert (hosts != null);

        if (hosts.length > _maxHostsPerCluster) {
          String msg =
              "vCenter cluster size is too big (current configured cluster size: "
                  + _maxHostsPerCluster
                  + ")";
          s_logger.error(msg);
          throw new DiscoveredWithErrorException(msg);
        }

        for (ManagedObjectReference morHost : hosts) {
          // For ESX host, we need to enable host firewall to allow VNC access
          HostMO hostMo = new HostMO(serviceContext, morHost);
          HostFirewallSystemMO firewallMo = hostMo.getHostFirewallSystemMO();
          if (firewallMo != null) {
            firewallMo.enableRuleset("vncServer");
            firewallMo.refreshFirewall();
          }

          String managementPortGroupName =
              hostMo.getPortGroupNameByNicType(HostVirtualNicType.management);
          assert (managementPortGroupName != null);
          HostPortGroupSpec spec = hostMo.getPortGroupSpec(managementPortGroupName);
          Integer vlanId = null;
          if (spec.getVlanId() != 0) {
            vlanId = spec.getVlanId();
          }

          // prepare at least one network on the vswitch to enable OVF importing
          HypervisorHostHelper.preparePrivateNetwork(
              _privateNetworkVSwitchName, hostMo, vlanId, 180000);
          returnedHostList.add(morHost);
        }
        return returnedHostList;
      } else if (mor.getType().equals("HostSystem")) {
        // For ESX host, we need to enable host firewall to allow VNC access
        HostMO hostMo = new HostMO(serviceContext, mor);
        HostFirewallSystemMO firewallMo = hostMo.getHostFirewallSystemMO();
        if (firewallMo != null) {
          firewallMo.enableRuleset("vncServer");
          firewallMo.refreshFirewall();
        }

        String managementPortGroupName =
            hostMo.getPortGroupNameByNicType(HostVirtualNicType.management);
        assert (managementPortGroupName != null);
        HostPortGroupSpec spec = hostMo.getPortGroupSpec(managementPortGroupName);
        Integer vlanId = null;
        if (spec.getVlanId() != 0) {
          vlanId = spec.getVlanId();
        }

        // prepare at least one network on the vswitch to enable OVF importing
        HypervisorHostHelper.preparePrivateNetwork(
            _privateNetworkVSwitchName, hostMo, vlanId, 180000);
        returnedHostList.add(mor);
        return returnedHostList;
      } else {
        s_logger.error(
            "Unsupport host type "
                + mor.getType()
                + ":"
                + mor.get_value()
                + " from inventory path: "
                + hostInventoryPath);
        return null;
      }
    }

    s_logger.error("Unable to find host from inventory path: " + hostInventoryPath);
    return null;
  }