southbound/southbound-impl/src/main/java/org/opendaylight/ovsdb/southbound/SouthboundUtil.java

   1 /*
   2  * Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.ovsdb.southbound;
   9
  10 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  11 import org.opendaylight.controller.md.sal.binding.api.ReadOnlyTransaction;
  12 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  13 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
  14 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.rev150105.OvsdbBridgeAttributes;
  15 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.rev150105.OvsdbNodeAugmentation;
  16 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.rev150105.OvsdbNodeRef;
  17 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node;
  18 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  19 import org.slf4j.Logger;
  20 import org.slf4j.LoggerFactory;
  21
  22 import com.google.common.base.Optional;
  23 import com.google.common.base.Preconditions;
  24 import com.google.common.util.concurrent.CheckedFuture;
  25
  26 public class SouthboundUtil {
  27
  28     private static final Logger LOG = LoggerFactory.getLogger(SouthboundUtil.class);
  29
  30
  31     public static Optional<OvsdbNodeAugmentation> getManagingNode(DataBroker db,OvsdbBridgeAttributes mn) {
  32         Preconditions.checkNotNull(mn);
  33         try {
  34             OvsdbNodeRef ref = mn.getManagedBy();
  35             if(ref != null && ref.getValue() != null) {
  36                 ReadOnlyTransaction transaction = db.newReadOnlyTransaction();
  37                 @SuppressWarnings("unchecked") // Note: erasure makes this safe in combination with the typecheck below
  38                 InstanceIdentifier<Node> path = (InstanceIdentifier<Node>) ref.getValue();
  39                 CheckedFuture<Optional<Node>, ReadFailedException> nf = transaction.read(LogicalDatastoreType.OPERATIONAL, path);
  40                 transaction.close();
  41                 Optional<Node> optional = nf.get();
  42                 if(optional != null && optional.isPresent() && optional.get() instanceof Node) {
  43                     OvsdbNodeAugmentation ovsdbNode = optional.get().getAugmentation(OvsdbNodeAugmentation.class);
  44                     if(ovsdbNode !=null) {
  45                         return Optional.of(ovsdbNode);
  46                     } else {
  47                         LOG.warn("OvsdbManagedNode {} claims to be managed by {} but that OvsdbNode does not exist",mn,ref.getValue());
  48                         return Optional.absent();
  49                     }
  50                 } else {
  51                     LOG.warn("Mysteriously got back a thing which is *not* a topology Node: {}",optional);
  52                     return Optional.absent();
  53                 }
  54             } else {
  55                 LOG.warn("Cannot find client for OvsdbManagedNode without a specified ManagedBy {}",mn);
  56                 return Optional.absent();
  57             }
  58          } catch (Exception e) {
  59              LOG.warn("Failed to get OvsdbNode that manages OvsdbManagedNode {}",mn, e);
  60              return Optional.absent();
  61          }
  62     }
  63 }