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.ENTITY_ID_QNAME;
  11 import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_OWNERS_PATH;
  12 import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_OWNER_NODE_ID;
  13 import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_QNAME;
  14 import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_TYPE_QNAME;
  15 import com.google.common.base.Objects;
  16 import com.google.common.base.Optional;
  17 import java.util.Collection;
  18 import java.util.Map.Entry;
  19 import org.opendaylight.controller.cluster.datastore.ShardDataTree;
  20 import org.opendaylight.controller.md.sal.common.api.clustering.Entity;
  21 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeListener;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.md.sal.clustering.entity.owners.rev150804.entity.owners.EntityType;
  23 import org.opendaylight.yangtools.yang.common.QName;
  24 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  25 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
  26 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  27 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
  28 import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
  29 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  30 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  31 import org.slf4j.Logger;
  32 import org.slf4j.LoggerFactory;
  33
  34 /**
  35  * Listens for entity owner changes and notifies the EntityOwnershipListenerSupport appropriately.
  36  *
  37  * @author Thomas Pantelis
  38  */
  39 class EntityOwnerChangeListener implements DOMDataTreeChangeListener {
  40     private static final Logger LOG = LoggerFactory.getLogger(EntityOwnerChangeListener.class);
  41
  42     private final String localMemberName;
  43     private final EntityOwnershipListenerSupport listenerSupport;
  44
  45     EntityOwnerChangeListener(String localMemberName, EntityOwnershipListenerSupport listenerSupport) {
  46         this.localMemberName = localMemberName;
  47         this.listenerSupport = listenerSupport;
  48     }
  49
  50     void init(ShardDataTree shardDataTree) {
  51         shardDataTree.registerTreeChangeListener(YangInstanceIdentifier.builder(ENTITY_OWNERS_PATH).
  52                 node(EntityType.QNAME).node(EntityType.QNAME).node(ENTITY_QNAME).node(ENTITY_QNAME).build(), this);
  53     }
  54
  55     @Override
  56     public void onDataTreeChanged(Collection<DataTreeCandidate> changes) {
  57         for(DataTreeCandidate change: changes) {
  58             MapEntryNode entityNode = (MapEntryNode) change.getRootNode().getDataAfter().get();
  59
  60             LOG.debug("Entity node updated: {}", change.getRootPath());
  61
  62             String newOwner = extractOwner(entityNode);
  63
  64             String origOwner = null;
  65             Optional<NormalizedNode<?, ?>> dataBefore = change.getRootNode().getDataBefore();
  66             if(dataBefore.isPresent()) {
  67                 MapEntryNode origEntityNode = (MapEntryNode) change.getRootNode().getDataBefore().get();
  68                 origOwner = extractOwner(origEntityNode);
  69             }
  70
  71             LOG.debug("New owner: {}, Original owner: {}", newOwner, origOwner);
  72
  73             boolean isOwner = Objects.equal(localMemberName, newOwner);
  74             boolean wasOwner = Objects.equal(localMemberName, origOwner);
  75             if(isOwner || wasOwner) {
  76                 Entity entity = createEntity(change.getRootPath());
  77
  78                 LOG.debug("Calling notifyEntityOwnershipListeners: entity: {}, wasOwner: {}, isOwner: {}",
  79                         entity, wasOwner, isOwner);
  80
  81                 listenerSupport.notifyEntityOwnershipListeners(entity, wasOwner, isOwner);
  82             }
  83         }
  84     }
  85
  86     private Entity createEntity(YangInstanceIdentifier entityPath) {
  87         String entityType = null;
  88         YangInstanceIdentifier entityId = null;
  89         for(PathArgument pathArg: entityPath.getPathArguments()) {
  90             if(pathArg instanceof NodeIdentifierWithPredicates) {
  91                 NodeIdentifierWithPredicates nodeKey = (NodeIdentifierWithPredicates) pathArg;
  92                 Entry<QName, Object> key = nodeKey.getKeyValues().entrySet().iterator().next();
  93                 if(ENTITY_TYPE_QNAME.equals(key.getKey())) {
  94                     entityType = key.getValue().toString();
  95                 } else if(ENTITY_ID_QNAME.equals(key.getKey())) {
  96                     entityId = (YangInstanceIdentifier) key.getValue();
  97                 }
  98             }
  99         }
 100
 101         return new Entity(entityType, entityId);
 102     }
 103
 104     private String extractOwner(MapEntryNode entityNode) {
 105         Optional<DataContainerChild<? extends PathArgument, ?>> ownerNode = entityNode.getChild(ENTITY_OWNER_NODE_ID);
 106         return ownerNode.isPresent() ? (String) ownerNode.get().getValue() : null;
 107     }
 108 }