opendaylight/md-sal/sal-distributed-eos/src/main/java/org/opendaylight/controller/cluster/entityownership/EntityOwnerChangeListener.java

   1 /*
   2  * Copyright (c) 2015 Brocade Communications 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.controller.cluster.entityownership;
   9
  10 import static com.google.common.base.Verify.verifyNotNull;
  11 import static java.util.Objects.requireNonNull;
  12 import static org.opendaylight.controller.cluster.entityownership.EntityOwnersModel.createEntity;
  13
  14 import com.google.common.base.Strings;
  15 import java.util.Collection;
  16 import java.util.Objects;
  17 import java.util.Optional;
  18 import org.opendaylight.controller.cluster.access.concepts.MemberName;
  19 import org.opendaylight.mdsal.eos.dom.api.DOMEntity;
  20 import org.opendaylight.yangtools.yang.data.api.schema.LeafNode;
  21 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  22 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  23 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNode;
  24 import org.slf4j.Logger;
  25 import org.slf4j.LoggerFactory;
  26
  27 /**
  28  * Listens for entity owner changes and notifies the EntityOwnershipListenerSupport appropriately.
  29  *
  30  * @author Thomas Pantelis
  31  */
  32 class EntityOwnerChangeListener extends AbstractEntityOwnerChangeListener {
  33     private static final Logger LOG = LoggerFactory.getLogger(EntityOwnerChangeListener.class);
  34
  35     private final String localMemberName;
  36     private final EntityOwnershipChangePublisher publisher;
  37
  38     EntityOwnerChangeListener(final MemberName localMemberName, final EntityOwnershipChangePublisher publisher) {
  39         this.localMemberName = verifyNotNull(localMemberName.getName());
  40         this.publisher = requireNonNull(publisher);
  41     }
  42
  43     @Override
  44     public void onInitialData() {
  45         // No-op
  46     }
  47
  48     @Override
  49     public void onDataTreeChanged(final Collection<DataTreeCandidate> changes) {
  50         for (DataTreeCandidate change: changes) {
  51             DataTreeCandidateNode changeRoot = change.getRootNode();
  52             LeafNode<?> ownerLeaf = (LeafNode<?>) changeRoot.getDataAfter().get();
  53
  54             LOG.debug("{}: Entity node changed: {}, {}", logId(), changeRoot.getModificationType(),
  55                     change.getRootPath());
  56
  57             String newOwner = extractOwner(ownerLeaf);
  58
  59             String origOwner = null;
  60             Optional<NormalizedNode> dataBefore = changeRoot.getDataBefore();
  61             if (dataBefore.isPresent()) {
  62                 origOwner = extractOwner((LeafNode<?>) changeRoot.getDataBefore().get());
  63             }
  64
  65             LOG.debug("{}: New owner: {}, Original owner: {}", logId(), newOwner, origOwner);
  66
  67             if (!Objects.equals(origOwner, newOwner)) {
  68                 boolean isOwner = localMemberName.equals(newOwner);
  69                 boolean wasOwner = localMemberName.equals(origOwner);
  70                 boolean hasOwner = !Strings.isNullOrEmpty(newOwner);
  71
  72                 DOMEntity entity = createEntity(change.getRootPath());
  73
  74                 LOG.debug(
  75                     "{}: Calling notifyEntityOwnershipListeners: entity: {}, wasOwner: {}, isOwner: {}, hasOwner: {}",
  76                     logId(), entity, wasOwner, isOwner, hasOwner);
  77
  78                 publisher.notifyEntityOwnershipListeners(entity, wasOwner, isOwner, hasOwner);
  79             }
  80         }
  81     }
  82
  83     private String logId() {
  84         return publisher.getLogId();
  85     }
  86 }