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(
  40                         LogicalDatastoreType.OPERATIONAL, path);
  41                 transaction.close();
  42                 Optional<Node> optional = nf.get();
  43                 if (optional != null && optional.isPresent() && optional.get() instanceof Node) {
  44                     OvsdbNodeAugmentation ovsdbNode = optional.get().getAugmentation(OvsdbNodeAugmentation.class);
  45                     if (ovsdbNode != null) {
  46                         return Optional.of(ovsdbNode);
  47                     } else {
  48                         LOG.warn("OvsdbManagedNode {} claims to be managed by {} but "
  49                                 + "that OvsdbNode does not exist", mn,ref.getValue());
  50                         return Optional.absent();
  51                     }
  52                 } else {
  53                     LOG.warn("Mysteriously got back a thing which is *not* a topology Node: {}",optional);
  54                     return Optional.absent();
  55                 }
  56             } else {
  57                 LOG.warn("Cannot find client for OvsdbManagedNode without a specified ManagedBy {}",mn);
  58                 return Optional.absent();
  59             }
  60         } catch (Exception e) {
  61             LOG.warn("Failed to get OvsdbNode that manages OvsdbManagedNode {}", mn, e);
  62             return Optional.absent();
  63         }
  64     }
  65 }