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