/*
* Copyright (c) 2017 Cisco 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.sharding;
import static akka.actor.ActorRef.noSender;
import static org.opendaylight.controller.cluster.datastore.utils.ClusterUtils.SHARD_PREFIX_QNAME;
import static org.opendaylight.controller.cluster.datastore.utils.ClusterUtils.SHARD_REPLICAS_QNAME;
import static org.opendaylight.controller.cluster.datastore.utils.ClusterUtils.SHARD_REPLICA_QNAME;
import akka.actor.ActorRef;
import com.google.common.base.Preconditions;
import java.util.Collection;
import java.util.EnumMap;
import java.util.List;
import java.util.stream.Collectors;
import javax.annotation.Nonnull;
import org.opendaylight.controller.cluster.access.concepts.MemberName;
import org.opendaylight.controller.cluster.datastore.AbstractDataStore;
import org.opendaylight.controller.cluster.datastore.config.PrefixShardConfiguration;
import org.opendaylight.controller.cluster.datastore.shardstrategy.PrefixShardStrategy;
import org.opendaylight.controller.cluster.datastore.utils.ClusterUtils;
import org.opendaylight.controller.cluster.sharding.messages.PrefixShardCreated;
import org.opendaylight.controller.cluster.sharding.messages.PrefixShardRemoved;
import org.opendaylight.controller.md.sal.dom.api.ClusteredDOMDataTreeChangeListener;
import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
import org.opendaylight.yangtools.concepts.ListenerRegistration;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
import org.opendaylight.yangtools.yang.data.api.schema.LeafNode;
import org.opendaylight.yangtools.yang.data.api.schema.LeafSetNode;
import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
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 on changes on prefix-shard-configuration. Resolves the changes and
* notifies handling actor with {@link PrefixShardCreated} and
* {@link PrefixShardRemoved} messages.
*/
public class PrefixedShardConfigUpdateHandler {
private static final Logger LOG = LoggerFactory.getLogger(PrefixedShardConfigUpdateHandler.class);
private final ActorRef handlingActor;
private final MemberName memberName;
private final EnumMap<LogicalDatastoreType,
ListenerRegistration<org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeListener>> registrations =
new EnumMap<>(LogicalDatastoreType.class);
public PrefixedShardConfigUpdateHandler(final ActorRef handlingActor, final MemberName memberName) {
this.handlingActor = Preconditions.checkNotNull(handlingActor);
this.memberName = Preconditions.checkNotNull(memberName);
}
public void initListener(final AbstractDataStore dataStore, final LogicalDatastoreType type) {
registrations.put(type, dataStore.registerShardConfigListener(
ClusterUtils.SHARD_LIST_PATH, new ShardConfigHandler(memberName, type, handlingActor)));
}
public void close() {
registrations.values().forEach(ListenerRegistration::close);
registrations.clear();
}
public static final class ShardConfigHandler implements ClusteredDOMDataTreeChangeListener {
private final MemberName memberName;
private final LogicalDatastoreType type;
private final ActorRef handlingActor;
private final String logName;
public ShardConfigHandler(final MemberName memberName,
final LogicalDatastoreType type,
final ActorRef handlingActor) {
this.memberName = memberName;
this.type = type;
this.handlingActor = handlingActor;
logName = memberName.getName() + "-" + type;
}
@Override
public void onDataTreeChanged(@Nonnull final Collection<DataTreeCandidate> changes) {
changes.forEach(this::resolveChange);
}
private void resolveChange(final DataTreeCandidate candidate) {
switch (candidate.getRootNode().getModificationType()) {
case UNMODIFIED:
break;
case SUBTREE_MODIFIED:
case APPEARED:
case WRITE:
resolveWrite(candidate.getRootNode());
break;
case DELETE:
case DISAPPEARED:
resolveDelete(candidate.getRootNode());
break;
default:
break;
}
}
private void resolveWrite(final DataTreeCandidateNode rootNode) {
LOG.debug("{}: New config received {}", logName, rootNode);
LOG.debug("{}: Data after: {}", logName, rootNode.getDataAfter());
// were in the shards list, iter children and resolve
for (final DataTreeCandidateNode childNode : rootNode.getChildNodes()) {
switch (childNode.getModificationType()) {
case UNMODIFIED:
break;
case SUBTREE_MODIFIED:
case APPEARED:
case WRITE:
resolveWrittenShard(childNode);
break;
case DELETE:
case DISAPPEARED:
resolveDeletedShard(childNode);
break;
default:
break;
}
}
}
@SuppressWarnings("unchecked")
private void resolveWrittenShard(final DataTreeCandidateNode childNode) {
final MapEntryNode entryNode = (MapEntryNode) childNode.getDataAfter().get();
final LeafNode<YangInstanceIdentifier> prefix =
(LeafNode<YangInstanceIdentifier>) entryNode.getChild(new NodeIdentifier(SHARD_PREFIX_QNAME)).get();
final YangInstanceIdentifier identifier = prefix.getValue();
LOG.debug("{}: Deserialized {} from datastore", logName, identifier);
final ContainerNode replicas =
(ContainerNode) entryNode.getChild(new NodeIdentifier(SHARD_REPLICAS_QNAME)).get();
final LeafSetNode<String> replicaList =
(LeafSetNode<String>) replicas.getChild(new NodeIdentifier(SHARD_REPLICA_QNAME)).get();
final List<MemberName> retReplicas = replicaList.getValue().stream()
.map(child -> MemberName.forName(child.getValue()))
.collect(Collectors.toList());
LOG.debug("{}: Replicas read from ds {}", logName, retReplicas.toString());
final PrefixShardConfiguration newConfig =
new PrefixShardConfiguration(new DOMDataTreeIdentifier(type, identifier),
PrefixShardStrategy.NAME, retReplicas);
LOG.debug("{}: Resulting config {} - sending PrefixShardCreated to {}", logName, newConfig, handlingActor);
handlingActor.tell(new PrefixShardCreated(newConfig), noSender());
}
private void resolveDeletedShard(final DataTreeCandidateNode childNode) {
final MapEntryNode entryNode = (MapEntryNode) childNode.getDataBefore().get();
final LeafNode<YangInstanceIdentifier> prefix =
(LeafNode<YangInstanceIdentifier>) entryNode.getChild(new NodeIdentifier(SHARD_PREFIX_QNAME)).get();
final YangInstanceIdentifier deleted = prefix.getValue();
LOG.debug("{}: Removing shard at {}.", memberName, deleted);
final DOMDataTreeIdentifier domDataTreeIdentifier = new DOMDataTreeIdentifier(type, deleted);
final PrefixShardRemoved message = new PrefixShardRemoved(domDataTreeIdentifier);
handlingActor.tell(message, noSender());
}
private void resolveDelete(final DataTreeCandidateNode rootNode) {
}
@Override
public String toString() {
return "ShardConfigHandler [logName=" + logName + ", handlingActor=" + handlingActor + "]";
}
}
}