/*
* Copyright (c) 2015 Brocade Communications Systems, Inc. and others. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package org.opendaylight.controller.cluster.datastore.entityownership;
import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.createEntity;
import com.google.common.base.Optional;
import com.google.common.base.Preconditions;
import com.google.common.base.Strings;
import com.google.common.base.Verify;
import java.util.Collection;
import java.util.Objects;
import org.opendaylight.controller.cluster.access.concepts.MemberName;
import org.opendaylight.mdsal.eos.dom.api.DOMEntity;
import org.opendaylight.yangtools.yang.data.api.schema.LeafNode;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Listens for entity owner changes and notifies the EntityOwnershipListenerSupport appropriately.
*
* @author Thomas Pantelis
*/
class EntityOwnerChangeListener extends AbstractEntityOwnerChangeListener {
private static final Logger LOG = LoggerFactory.getLogger(EntityOwnerChangeListener.class);
private final String localMemberName;
private final EntityOwnershipChangePublisher publisher;
EntityOwnerChangeListener(final MemberName localMemberName, final EntityOwnershipChangePublisher publisher) {
this.localMemberName = Verify.verifyNotNull(localMemberName.getName());
this.publisher = Preconditions.checkNotNull(publisher);
}
@Override
public void onDataTreeChanged(final Collection<DataTreeCandidate> changes) {
for (DataTreeCandidate change: changes) {
DataTreeCandidateNode changeRoot = change.getRootNode();
LeafNode<?> ownerLeaf = (LeafNode<?>) changeRoot.getDataAfter().get();
LOG.debug("{}: Entity node changed: {}, {}", logId(), changeRoot.getModificationType(),
change.getRootPath());
String newOwner = extractOwner(ownerLeaf);
String origOwner = null;
Optional<NormalizedNode<?, ?>> dataBefore = changeRoot.getDataBefore();
if (dataBefore.isPresent()) {
origOwner = extractOwner((LeafNode<?>) changeRoot.getDataBefore().get());
}
LOG.debug("{}: New owner: {}, Original owner: {}", logId(), newOwner, origOwner);
if (!Objects.equals(origOwner, newOwner)) {
boolean isOwner = localMemberName.equals(newOwner);
boolean wasOwner = localMemberName.equals(origOwner);
boolean hasOwner = !Strings.isNullOrEmpty(newOwner);
DOMEntity entity = createEntity(change.getRootPath());
LOG.debug(
"{}: Calling notifyEntityOwnershipListeners: entity: {}, wasOwner: {}, isOwner: {}, hasOwner: {}",
logId(), entity, wasOwner, isOwner, hasOwner);
publisher.notifyEntityOwnershipListeners(entity, wasOwner, isOwner, hasOwner);
}
}
}
private String logId() {
return publisher.getLogId();
}
}