opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/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.datastore.entityownership;
   9
  10 import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.createEntity;
  11
  12 import com.google.common.base.Preconditions;
  13 import com.google.common.base.Strings;
  14 import com.google.common.base.Verify;
  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 = Verify.verifyNotNull(localMemberName.getName());
  40         this.publisher = Preconditions.checkNotNull(publisher);
  41     }
  42
  43     @Override
  44     public void onDataTreeChanged(final Collection<DataTreeCandidate> changes) {
  45         for (DataTreeCandidate change: changes) {
  46             DataTreeCandidateNode changeRoot = change.getRootNode();
  47             LeafNode<?> ownerLeaf = (LeafNode<?>) changeRoot.getDataAfter().get();
  48
  49             LOG.debug("{}: Entity node changed: {}, {}", logId(), changeRoot.getModificationType(),
  50                     change.getRootPath());
  51
  52             String newOwner = extractOwner(ownerLeaf);
  53
  54             String origOwner = null;
  55             Optional<NormalizedNode<?, ?>> dataBefore = changeRoot.getDataBefore();
  56             if (dataBefore.isPresent()) {
  57                 origOwner = extractOwner((LeafNode<?>) changeRoot.getDataBefore().get());
  58             }
  59
  60             LOG.debug("{}: New owner: {}, Original owner: {}", logId(), newOwner, origOwner);
  61
  62             if (!Objects.equals(origOwner, newOwner)) {
  63                 boolean isOwner = localMemberName.equals(newOwner);
  64                 boolean wasOwner = localMemberName.equals(origOwner);
  65                 boolean hasOwner = !Strings.isNullOrEmpty(newOwner);
  66
  67                 DOMEntity entity = createEntity(change.getRootPath());
  68
  69                 LOG.debug(
  70                     "{}: Calling notifyEntityOwnershipListeners: entity: {}, wasOwner: {}, isOwner: {}, hasOwner: {}",
  71                     logId(), entity, wasOwner, isOwner, hasOwner);
  72
  73                 publisher.notifyEntityOwnershipListeners(entity, wasOwner, isOwner, hasOwner);
  74             }
  75         }
  76     }
  77
  78     private String logId() {
  79         return publisher.getLogId();
  80     }
  81 }