+/*
+ * 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;
+
+ public ShardConfigHandler(final MemberName memberName,
+ final LogicalDatastoreType type,
+ final ActorRef handlingActor) {
+ this.memberName = memberName;
+ this.type = type;
+ this.handlingActor = handlingActor;
+ }
+
+ @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 {}", memberName, rootNode);
+ LOG.debug("{}: Data after: {}", memberName, 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;
+ }
+ }
+ }
+
+ 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", memberName, 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 {}", memberName, retReplicas.toString());
+
+ final PrefixShardConfiguration newConfig =
+ new PrefixShardConfiguration(new DOMDataTreeIdentifier(type, identifier),
+ PrefixShardStrategy.NAME, retReplicas);
+
+ LOG.debug("{}: Resulting config {}", memberName, newConfig);
+
+ 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) {
+
+ }
+ }
+}
Code Review / controller.git / commitdiff