--- /dev/null
+/*
+ * Copyright (c) 2016 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 com.google.common.base.Preconditions;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import javax.annotation.Nonnull;
+import javax.annotation.concurrent.GuardedBy;
+import org.opendaylight.controller.cluster.databroker.actors.dds.DataStoreClient;
+import org.opendaylight.controller.cluster.datastore.DistributedDataStore;
+import org.opendaylight.mdsal.dom.api.DOMDataTreeChangeListener;
+import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
+import org.opendaylight.mdsal.dom.api.DOMDataTreeShard;
+import org.opendaylight.mdsal.dom.spi.shard.ChildShardContext;
+import org.opendaylight.mdsal.dom.spi.shard.DOMDataTreeShardProducer;
+import org.opendaylight.mdsal.dom.spi.shard.ForeignShardModificationContext;
+import org.opendaylight.mdsal.dom.spi.shard.ReadableWriteableDOMDataTreeShard;
+import org.opendaylight.mdsal.dom.spi.shard.SubshardProducerSpecification;
+import org.opendaylight.mdsal.dom.spi.shard.WriteableDOMDataTreeShard;
+import org.opendaylight.yangtools.concepts.ListenerRegistration;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Proxy implementation of a shard that creates forwarding producers to the backend shard.
+ */
+class DistributedShardFrontend implements ReadableWriteableDOMDataTreeShard {
+
+ private static final Logger LOG = LoggerFactory.getLogger(DistributedShardFrontend.class);
+
+ private final DataStoreClient client;
+ private final DOMDataTreeIdentifier shardRoot;
+ @GuardedBy("this")
+ private final Map<DOMDataTreeIdentifier, ChildShardContext> childShards = new HashMap<>();
+ @GuardedBy("this")
+ private final List<ShardProxyProducer> producers = new ArrayList<>();
+ private final DistributedDataStore distributedDataStore;
+
+ DistributedShardFrontend(final DistributedDataStore distributedDataStore,
+ final DataStoreClient client,
+ final DOMDataTreeIdentifier shardRoot) {
+ this.distributedDataStore = Preconditions.checkNotNull(distributedDataStore);
+ this.client = Preconditions.checkNotNull(client);
+ this.shardRoot = Preconditions.checkNotNull(shardRoot);
+ }
+
+ @Override
+ public synchronized DOMDataTreeShardProducer createProducer(final Collection<DOMDataTreeIdentifier> paths) {
+ for (final DOMDataTreeIdentifier prodPrefix : paths) {
+ Preconditions.checkArgument(paths.contains(prodPrefix), "Prefix %s is not contained under shard root",
+ prodPrefix, paths);
+ }
+
+ final ShardProxyProducer ret =
+ new ShardProxyProducer(shardRoot, paths, client, createModificationFactory(paths));
+ producers.add(ret);
+ return ret;
+ }
+
+ @Override
+ public synchronized void onChildAttached(final DOMDataTreeIdentifier prefix, final DOMDataTreeShard child) {
+ LOG.debug("{} : Child shard attached at {}", shardRoot, prefix);
+ Preconditions.checkArgument(child != this, "Attempted to attach child %s onto self", this);
+ addChildShard(prefix, child);
+ updateProducers();
+ }
+
+ @Override
+ public synchronized void onChildDetached(final DOMDataTreeIdentifier prefix, final DOMDataTreeShard child) {
+ LOG.debug("{} : Child shard detached at {}", shardRoot, prefix);
+ childShards.remove(prefix);
+ updateProducers();
+ // TODO we should grab the dataTreeSnapshot that's in the shard and apply it to this shard
+ }
+
+ private void addChildShard(final DOMDataTreeIdentifier prefix, final DOMDataTreeShard child) {
+ Preconditions.checkArgument(child instanceof WriteableDOMDataTreeShard);
+ childShards.put(prefix, new ChildShardContext(prefix, (WriteableDOMDataTreeShard) child));
+ }
+
+ DistributedShardModificationFactory createModificationFactory(final Collection<DOMDataTreeIdentifier> prefixes) {
+ // TODO this could be abstract
+ final Map<DOMDataTreeIdentifier, SubshardProducerSpecification> affectedSubshards = new HashMap<>();
+
+ for (final DOMDataTreeIdentifier producerPrefix : prefixes) {
+ for (final ChildShardContext maybeAffected : childShards.values()) {
+ final DOMDataTreeIdentifier bindPath;
+ if (producerPrefix.contains(maybeAffected.getPrefix())) {
+ bindPath = maybeAffected.getPrefix();
+ } else if (maybeAffected.getPrefix().contains(producerPrefix)) {
+ // Bound path is inside subshard
+ bindPath = producerPrefix;
+ } else {
+ continue;
+ }
+
+ SubshardProducerSpecification spec = affectedSubshards.get(maybeAffected.getPrefix());
+ if (spec == null) {
+ spec = new SubshardProducerSpecification(maybeAffected);
+ affectedSubshards.put(maybeAffected.getPrefix(), spec);
+ }
+ spec.addPrefix(bindPath);
+ }
+ }
+
+ final DistributedShardModificationFactoryBuilder builder =
+ new DistributedShardModificationFactoryBuilder(shardRoot);
+ for (final SubshardProducerSpecification spec : affectedSubshards.values()) {
+ final ForeignShardModificationContext foreignContext =
+ new ForeignShardModificationContext(spec.getPrefix(), spec.createProducer());
+ builder.addSubshard(foreignContext);
+ builder.addSubshard(spec.getPrefix(), foreignContext);
+ }
+
+ return builder.build();
+ }
+
+ private void updateProducers() {
+ for (final ShardProxyProducer producer : producers) {
+ producer.setModificationFactory(createModificationFactory(producer.getPrefixes()));
+ }
+ }
+
+ @Nonnull
+ @Override
+ public <L extends DOMDataTreeChangeListener> ListenerRegistration<L> registerTreeChangeListener(
+ final YangInstanceIdentifier treeId, final L listener) {
+ throw new UnsupportedOperationException("Listener registration not supported");
+ }
+
+}
Code Review / controller.git / blobdiff