+/*
+ * Copyright (c) 2015 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.datastore;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Optional;
+import com.google.common.base.Strings;
+import java.util.AbstractMap.SimpleEntry;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Map.Entry;
+import javax.annotation.concurrent.NotThreadSafe;
+import org.opendaylight.controller.md.sal.common.api.data.AsyncDataBroker.DataChangeScope;
+import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeListener;
+import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeListener;
+import org.opendaylight.controller.md.sal.dom.store.impl.DOMImmutableDataChangeEvent;
+import org.opendaylight.controller.md.sal.dom.store.impl.ResolveDataChangeEventsTask;
+import org.opendaylight.controller.md.sal.dom.store.impl.tree.ListenerTree;
+import org.opendaylight.controller.sal.core.spi.data.DOMStoreThreePhaseCommitCohort;
+import org.opendaylight.yangtools.concepts.ListenerRegistration;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
+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.DataTreeCandidateTip;
+import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidates;
+import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeModification;
+import org.opendaylight.yangtools.yang.data.api.schema.tree.TipProducingDataTree;
+import org.opendaylight.yangtools.yang.data.impl.schema.tree.InMemoryDataTreeFactory;
+import org.opendaylight.yangtools.yang.model.api.SchemaContext;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Internal shard state, similar to a DOMStore, but optimized for use in the actor system,
+ * e.g. it does not expose public interfaces and assumes it is only ever called from a
+ * single thread.
+ *
+ * This class is not part of the API contract and is subject to change at any time.
+ */
+@NotThreadSafe
+@VisibleForTesting
+public final class ShardDataTree extends ShardDataTreeTransactionParent {
+ private static final Logger LOG = LoggerFactory.getLogger(ShardDataTree.class);
+ private static final ShardDataTreeNotificationManager MANAGER = new ShardDataTreeNotificationManager();
+ private final Map<String, ShardDataTreeTransactionChain> transactionChains = new HashMap<>();
+ private final ShardDataTreeChangePublisher treeChangePublisher = new ShardDataTreeChangePublisher();
+ private final ListenerTree listenerTree = ListenerTree.create();
+ private final TipProducingDataTree dataTree;
+
+ ShardDataTree(final SchemaContext schemaContext) {
+ dataTree = InMemoryDataTreeFactory.getInstance().create();
+ if (schemaContext != null) {
+ dataTree.setSchemaContext(schemaContext);
+ }
+ }
+
+ TipProducingDataTree getDataTree() {
+ return dataTree;
+ }
+
+ void updateSchemaContext(final SchemaContext schemaContext) {
+ dataTree.setSchemaContext(schemaContext);
+ }
+
+ private ShardDataTreeTransactionChain ensureTransactionChain(final String chainId) {
+ ShardDataTreeTransactionChain chain = transactionChains.get(chainId);
+ if (chain == null) {
+ chain = new ShardDataTreeTransactionChain(chainId, this);
+ transactionChains.put(chainId, chain);
+ }
+
+ return chain;
+ }
+
+ ReadOnlyShardDataTreeTransaction newReadOnlyTransaction(final String txId, final String chainId) {
+ if (Strings.isNullOrEmpty(chainId)) {
+ return new ReadOnlyShardDataTreeTransaction(txId, dataTree.takeSnapshot());
+ }
+
+ return ensureTransactionChain(chainId).newReadOnlyTransaction(txId);
+ }
+
+ ReadWriteShardDataTreeTransaction newReadWriteTransaction(final String txId, final String chainId) {
+ if (Strings.isNullOrEmpty(chainId)) {
+ return new ReadWriteShardDataTreeTransaction(this, txId, dataTree.takeSnapshot().newModification());
+ }
+
+ return ensureTransactionChain(chainId).newReadWriteTransaction(txId);
+ }
+
+ void notifyListeners(final DataTreeCandidateTip candidate) {
+ LOG.debug("Notifying listeners on candidate {}", candidate);
+
+ // DataTreeChanges first, as they are more light-weight
+ treeChangePublisher.publishChanges(candidate);
+
+ // DataChanges second, as they are heavier
+ ResolveDataChangeEventsTask.create(candidate, listenerTree).resolve(MANAGER);
+ }
+
+ void closeAllTransactionChains() {
+ for (ShardDataTreeTransactionChain chain : transactionChains.values()) {
+ chain.close();
+ }
+
+ transactionChains.clear();
+ }
+
+ void closeTransactionChain(final String transactionChainId) {
+ final ShardDataTreeTransactionChain chain = transactionChains.remove(transactionChainId);
+ if (chain != null) {
+ chain.close();
+ } else {
+ LOG.warn("Closing non-existent transaction chain {}", transactionChainId);
+ }
+ }
+
+ Entry<ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>>, DOMImmutableDataChangeEvent> registerChangeListener(
+ final YangInstanceIdentifier path,
+ final AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>> listener, final DataChangeScope scope) {
+ final ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>> reg =
+ listenerTree.registerDataChangeListener(path, listener, scope);
+
+ final Optional<NormalizedNode<?, ?>> currentState = dataTree.takeSnapshot().readNode(path);
+ final DOMImmutableDataChangeEvent event;
+ if (currentState.isPresent()) {
+ final NormalizedNode<?, ?> data = currentState.get();
+ event = DOMImmutableDataChangeEvent.builder(DataChangeScope.BASE).setAfter(data).addCreated(path, data).build();
+ } else {
+ event = null;
+ }
+
+ return new SimpleEntry<>(reg, event);
+ }
+
+ Entry<ListenerRegistration<DOMDataTreeChangeListener>, DataTreeCandidate> registerTreeChangeListener(final YangInstanceIdentifier path,
+ final DOMDataTreeChangeListener listener) {
+ final ListenerRegistration<DOMDataTreeChangeListener> reg = treeChangePublisher.registerTreeChangeListener(path, listener);
+
+ final Optional<NormalizedNode<?, ?>> currentState = dataTree.takeSnapshot().readNode(path);
+ final DataTreeCandidate event;
+ if (currentState.isPresent()) {
+ event = DataTreeCandidates.fromNormalizedNode(path, currentState.get());
+ } else {
+ event = null;
+ }
+ return new SimpleEntry<>(reg, event);
+ }
+
+ @Override
+ void abortTransaction(final AbstractShardDataTreeTransaction<?> transaction) {
+ // Intentional no-op
+ }
+
+ @Override
+ DOMStoreThreePhaseCommitCohort finishTransaction(final ReadWriteShardDataTreeTransaction transaction) {
+ final DataTreeModification snapshot = transaction.getSnapshot();
+ snapshot.ready();
+ return new ShardDataTreeCohort(this, snapshot);
+ }
+}