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 import com.google.common.base.Optional;
  12 import com.google.common.base.Preconditions;
  13 import com.google.common.base.Strings;
  14 import java.util.Collection;
  15 import java.util.Objects;
  16 import org.opendaylight.controller.md.sal.common.api.clustering.Entity;
  17 import org.opendaylight.yangtools.yang.data.api.schema.LeafNode;
  18 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  19 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  20 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNode;
  21 import org.slf4j.Logger;
  22 import org.slf4j.LoggerFactory;
  23
  24 /**
  25  * Listens for entity owner changes and notifies the EntityOwnershipListenerSupport appropriately.
  26  *
  27  * @author Thomas Pantelis
  28  */
  29 class EntityOwnerChangeListener extends AbstractEntityOwnerChangeListener {
  30     private static final Logger LOG = LoggerFactory.getLogger(EntityOwnerChangeListener.class);
  31
  32     private final String localMemberName;
  33     private final EntityOwnershipListenerSupport listenerSupport;
  34
  35     EntityOwnerChangeListener(final String localMemberName, final EntityOwnershipListenerSupport listenerSupport) {
  36         this.localMemberName = Preconditions.checkNotNull(localMemberName);
  37         this.listenerSupport = Preconditions.checkNotNull(listenerSupport);
  38     }
  39
  40     @Override
  41     public void onDataTreeChanged(final Collection<DataTreeCandidate> changes) {
  42         for(DataTreeCandidate change: changes) {
  43             DataTreeCandidateNode changeRoot = change.getRootNode();
  44             LeafNode<?> ownerLeaf = (LeafNode<?>) changeRoot.getDataAfter().get();
  45
  46             LOG.debug("{}: Entity node changed: {}, {}", logId(), changeRoot.getModificationType(), change.getRootPath());
  47
  48             String newOwner = extractOwner(ownerLeaf);
  49
  50             String origOwner = null;
  51             Optional<NormalizedNode<?, ?>> dataBefore = changeRoot.getDataBefore();
  52             if(dataBefore.isPresent()) {
  53                 origOwner = extractOwner((LeafNode<?>) changeRoot.getDataBefore().get());
  54             }
  55
  56             LOG.debug("{}: New owner: {}, Original owner: {}", logId(), newOwner, origOwner);
  57
  58             if(!Objects.equals(origOwner, newOwner)) {
  59                 boolean isOwner = Objects.equals(localMemberName, newOwner);
  60                 boolean wasOwner = Objects.equals(localMemberName, origOwner);
  61                 boolean hasOwner = !Strings.isNullOrEmpty(newOwner);
  62
  63                 Entity entity = createEntity(change.getRootPath());
  64
  65                 LOG.debug("{}: Calling notifyEntityOwnershipListeners: entity: {}, wasOwner: {}, isOwner: {}, hasOwner: {}",
  66                         logId(), entity, wasOwner, isOwner, hasOwner);
  67
  68                 listenerSupport.notifyEntityOwnershipListeners(entity, wasOwner, isOwner, hasOwner);
  69             }
  70         }
  71     }
  72
  73     private String logId() {
  74         return listenerSupport.getLogId();
  75     }
  76 }