--- /dev/null
+/*
+ * Copyright (c) 2014 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.yangtools.yang.data.impl.schema.tree;
+
+import static java.util.Objects.requireNonNull;
+
+import com.google.common.base.MoreObjects;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.VarHandle;
+import java.util.Optional;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
+import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNodes;
+import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTree;
+import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
+import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeConfiguration;
+import org.opendaylight.yangtools.yang.data.spi.tree.TreeNode;
+import org.opendaylight.yangtools.yang.data.util.DataSchemaContextNode;
+import org.opendaylight.yangtools.yang.data.util.DataSchemaContextTree;
+import org.opendaylight.yangtools.yang.model.api.ContainerLike;
+import org.opendaylight.yangtools.yang.model.api.DataNodeContainer;
+import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
+import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
+import org.opendaylight.yangtools.yang.model.api.ListSchemaNode;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Read-only snapshot of the data tree.
+ */
+final class InMemoryDataTree extends AbstractDataTreeTip implements DataTree {
+ private static final VarHandle STATE;
+
+ static {
+ try {
+ STATE = MethodHandles.lookup().findVarHandle(InMemoryDataTree.class, "state", DataTreeState.class);
+ } catch (NoSuchFieldException | IllegalAccessException e) {
+ throw new ExceptionInInitializerError(e);
+ }
+ }
+
+ private static final Logger LOG = LoggerFactory.getLogger(InMemoryDataTree.class);
+
+ private final DataTreeConfiguration treeConfig;
+ private final boolean maskMandatory;
+
+ /**
+ * Current data store state generation. All accesses need to go through {@link #STATE}
+ */
+ @SuppressWarnings("unused")
+ private volatile DataTreeState state;
+
+ InMemoryDataTree(final TreeNode rootNode, final DataTreeConfiguration treeConfig,
+ final EffectiveModelContext schemaContext) {
+ this.treeConfig = requireNonNull(treeConfig, "treeConfig");
+ maskMandatory = true;
+ state = DataTreeState.createInitial(rootNode);
+ if (schemaContext != null) {
+ setEffectiveModelContext(schemaContext);
+ }
+ }
+
+ InMemoryDataTree(final TreeNode rootNode, final DataTreeConfiguration treeConfig,
+ final EffectiveModelContext schemaContext, final DataSchemaNode rootSchemaNode,
+ final boolean maskMandatory) {
+ this.treeConfig = requireNonNull(treeConfig, "treeConfig");
+ this.maskMandatory = maskMandatory;
+
+ state = DataTreeState.createInitial(rootNode).withSchemaContext(schemaContext, getOperation(rootSchemaNode));
+ }
+
+ private ModificationApplyOperation getOperation(final DataSchemaNode rootSchemaNode) {
+ if (rootSchemaNode instanceof ContainerLike && maskMandatory) {
+ return new ContainerModificationStrategy((ContainerLike) rootSchemaNode, treeConfig);
+ }
+ if (rootSchemaNode instanceof ListSchemaNode) {
+ final PathArgument arg = treeConfig.getRootPath().getLastPathArgument();
+ if (arg instanceof NodeIdentifierWithPredicates) {
+ return maskMandatory ? new MapEntryModificationStrategy((ListSchemaNode) rootSchemaNode, treeConfig)
+ : MapEntryModificationStrategy.of((ListSchemaNode) rootSchemaNode, treeConfig);
+ }
+ }
+
+ try {
+ return SchemaAwareApplyOperation.from(rootSchemaNode, treeConfig);
+ } catch (ExcludedDataSchemaNodeException e) {
+ throw new IllegalArgumentException("Root node does not belong current data tree", e);
+ }
+ }
+
+ @Override
+ public void setEffectiveModelContext(final EffectiveModelContext newModelContext) {
+ internalSetSchemaContext(newModelContext);
+ }
+
+ /*
+ * This method is synchronized to guard against user attempting to install
+ * multiple contexts. Otherwise it runs in a lock-free manner.
+ */
+ private synchronized void internalSetSchemaContext(final EffectiveModelContext newSchemaContext) {
+ requireNonNull(newSchemaContext);
+
+ LOG.debug("Following schema contexts will be attempted {}", newSchemaContext);
+
+ final DataSchemaContextTree contextTree = DataSchemaContextTree.from(newSchemaContext);
+ final Optional<DataSchemaContextNode<?>> rootContextNode = contextTree.findChild(getRootPath());
+ if (!rootContextNode.isPresent()) {
+ LOG.warn("Could not find root {} in new schema context, not upgrading", getRootPath());
+ return;
+ }
+
+ final DataSchemaNode rootSchemaNode = rootContextNode.get().getDataSchemaNode();
+ if (!(rootSchemaNode instanceof DataNodeContainer)) {
+ LOG.warn("Root {} resolves to non-container type {}, not upgrading", getRootPath(), rootSchemaNode);
+ return;
+ }
+
+ final ModificationApplyOperation rootNode = getOperation(rootSchemaNode);
+ DataTreeState currentState;
+ DataTreeState newState;
+ do {
+ currentState = currentState();
+ newState = currentState.withSchemaContext(newSchemaContext, rootNode);
+ // TODO: can we lower this to compareAndSwapRelease?
+ } while (!STATE.compareAndSet(this, currentState, newState));
+ }
+
+ @Override
+ public InMemoryDataTreeSnapshot takeSnapshot() {
+ return currentState().newSnapshot();
+ }
+
+ @Override
+ public void commit(final DataTreeCandidate candidate) {
+ if (candidate instanceof NoopDataTreeCandidate) {
+ return;
+ }
+ if (!(candidate instanceof InMemoryDataTreeCandidate)) {
+ throw new IllegalArgumentException("Invalid candidate class " + candidate.getClass());
+ }
+
+ final InMemoryDataTreeCandidate c = (InMemoryDataTreeCandidate)candidate;
+ if (LOG.isTraceEnabled()) {
+ LOG.trace("Data Tree is {}", NormalizedNodes.toStringTree(c.getTipRoot().getData()));
+ }
+
+ final TreeNode newRoot = c.getTipRoot();
+ DataTreeState currentState;
+ DataTreeState newState;
+ do {
+ currentState = currentState();
+ final TreeNode currentRoot = currentState.getRoot();
+ LOG.debug("Updating datastore from {} to {}", currentRoot, newRoot);
+
+ final TreeNode oldRoot = c.getBeforeRoot();
+ if (oldRoot != currentRoot) {
+ final String oldStr = simpleToString(oldRoot);
+ final String currentStr = simpleToString(currentRoot);
+ throw new IllegalStateException("Store tree " + currentStr + " and candidate base " + oldStr
+ + " differ.");
+ }
+
+ newState = currentState.withRoot(newRoot);
+ LOG.trace("Updated state from {} to {}", currentState, newState);
+ // TODO: can we lower this to compareAndSwapRelease?
+ } while (!STATE.compareAndSet(this, currentState, newState));
+ }
+
+ private static String simpleToString(final Object obj) {
+ return obj.getClass().getName() + "@" + Integer.toHexString(obj.hashCode());
+ }
+
+ private DataTreeState currentState() {
+ return (DataTreeState) STATE.getAcquire(this);
+ }
+
+ @Override
+ public YangInstanceIdentifier getRootPath() {
+ return treeConfig.getRootPath();
+ }
+
+ @Override
+ public String toString() {
+ return MoreObjects.toStringHelper(this)
+ .add("object", super.toString())
+ .add("config", treeConfig)
+ .add("state", currentState())
+ .toString();
+ }
+
+ @Override
+ protected TreeNode getTipRoot() {
+ return currentState().getRoot();
+ }
+}
Code Review / yangtools.git / blobdiff