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 com.google.common.base.Verify;
  15 import java.util.Collection;
  16 import java.util.Objects;
  17 import org.opendaylight.controller.cluster.access.concepts.MemberName;
  18 import org.opendaylight.controller.md.sal.common.api.clustering.Entity;
  19 import org.opendaylight.yangtools.yang.data.api.schema.LeafNode;
  20 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  21 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  22 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNode;
  23 import org.slf4j.Logger;
  24 import org.slf4j.LoggerFactory;
  25
  26 /**
  27  * Listens for entity owner changes and notifies the EntityOwnershipListenerSupport appropriately.
  28  *
  29  * @author Thomas Pantelis
  30  */
  31 class EntityOwnerChangeListener extends AbstractEntityOwnerChangeListener {
  32     private static final Logger LOG = LoggerFactory.getLogger(EntityOwnerChangeListener.class);
  33
  34     private final String localMemberName;
  35     private final EntityOwnershipListenerSupport listenerSupport;
  36
  37     EntityOwnerChangeListener(final MemberName localMemberName, final EntityOwnershipListenerSupport listenerSupport) {
  38         this.localMemberName = Verify.verifyNotNull(localMemberName.getName());
  39         this.listenerSupport = Preconditions.checkNotNull(listenerSupport);
  40     }
  41
  42     @Override
  43     public void onDataTreeChanged(final Collection<DataTreeCandidate> changes) {
  44         for(DataTreeCandidate change: changes) {
  45             DataTreeCandidateNode changeRoot = change.getRootNode();
  46             LeafNode<?> ownerLeaf = (LeafNode<?>) changeRoot.getDataAfter().get();
  47
  48             LOG.debug("{}: Entity node changed: {}, {}", logId(), changeRoot.getModificationType(), change.getRootPath());
  49
  50             String newOwner = extractOwner(ownerLeaf);
  51
  52             String origOwner = null;
  53             Optional<NormalizedNode<?, ?>> dataBefore = changeRoot.getDataBefore();
  54             if(dataBefore.isPresent()) {
  55                 origOwner = extractOwner((LeafNode<?>) changeRoot.getDataBefore().get());
  56             }
  57
  58             LOG.debug("{}: New owner: {}, Original owner: {}", logId(), newOwner, origOwner);
  59
  60             if (!Objects.equals(origOwner, newOwner)) {
  61                 boolean isOwner = localMemberName.equals(newOwner);
  62                 boolean wasOwner = localMemberName.equals(origOwner);
  63                 boolean hasOwner = !Strings.isNullOrEmpty(newOwner);
  64
  65                 Entity entity = createEntity(change.getRootPath());
  66
  67                 LOG.debug("{}: Calling notifyEntityOwnershipListeners: entity: {}, wasOwner: {}, isOwner: {}, hasOwner: {}",
  68                         logId(), entity, wasOwner, isOwner, hasOwner);
  69
  70                 listenerSupport.notifyEntityOwnershipListeners(entity, wasOwner, isOwner, hasOwner);
  71             }
  72         }
  73     }
  74
  75     private String logId() {
  76         return listenerSupport.getLogId();
  77     }
  78 }