/*
* 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 com.google.common.base.MoreObjects;
import com.google.common.base.Preconditions;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
import javax.annotation.Nonnull;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNodes;
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.api.schema.tree.TipProducingDataTree;
import org.opendaylight.yangtools.yang.data.api.schema.tree.spi.TreeNode;
import org.opendaylight.yangtools.yang.data.util.DataSchemaContextNode;
import org.opendaylight.yangtools.yang.data.util.DataSchemaContextTree;
import org.opendaylight.yangtools.yang.model.api.ContainerSchemaNode;
import org.opendaylight.yangtools.yang.model.api.DataNodeContainer;
import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
import org.opendaylight.yangtools.yang.model.api.SchemaContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Read-only snapshot of the data tree.
*/
final class InMemoryDataTree extends AbstractDataTreeTip implements TipProducingDataTree {
private static final AtomicReferenceFieldUpdater<InMemoryDataTree, DataTreeState> STATE_UPDATER =
AtomicReferenceFieldUpdater.newUpdater(InMemoryDataTree.class, DataTreeState.class, "state");
private static final Logger LOG = LoggerFactory.getLogger(InMemoryDataTree.class);
private final DataTreeConfiguration treeConfig;
private final boolean maskMandatory;
/**
* Current data store state generation.
*/
private volatile DataTreeState state;
InMemoryDataTree(final TreeNode rootNode, final DataTreeConfiguration treeConfig,
final SchemaContext schemaContext) {
this.treeConfig = Preconditions.checkNotNull(treeConfig, "treeConfig");
maskMandatory = true;
state = DataTreeState.createInitial(rootNode);
if (schemaContext != null) {
setSchemaContext(schemaContext);
}
}
InMemoryDataTree(final TreeNode rootNode, final DataTreeConfiguration treeConfig, final SchemaContext schemaContext,
final DataSchemaNode rootSchemaNode, final boolean maskMandatory) {
this.treeConfig = Preconditions.checkNotNull(treeConfig, "treeConfig");
this.maskMandatory = maskMandatory;
state = DataTreeState.createInitial(rootNode).withSchemaContext(schemaContext, getOperation(rootSchemaNode));
}
private ModificationApplyOperation getOperation(final DataSchemaNode rootSchemaNode) {
if (maskMandatory && rootSchemaNode instanceof ContainerSchemaNode) {
return new ContainerModificationStrategy((ContainerSchemaNode) rootSchemaNode, treeConfig);
}
return SchemaAwareApplyOperation.from(rootSchemaNode, treeConfig);
}
/*
* This method is synchronized to guard against user attempting to install
* multiple contexts. Otherwise it runs in a lock-free manner.
*/
@Override
public synchronized void setSchemaContext(final SchemaContext newSchemaContext) {
Preconditions.checkNotNull(newSchemaContext);
LOG.debug("Following schema contexts will be attempted {}", newSchemaContext);
final DataSchemaContextTree contextTree = DataSchemaContextTree.from(newSchemaContext);
final DataSchemaContextNode<?> rootContextNode = contextTree.getChild(getRootPath());
if (rootContextNode == null) {
LOG.warn("Could not find root {} in new schema context, not upgrading", getRootPath());
return;
}
final DataSchemaNode rootSchemaNode = rootContextNode.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, newState;
do {
currentState = state;
newState = currentState.withSchemaContext(newSchemaContext, rootNode);
} while (!STATE_UPDATER.compareAndSet(this, currentState, newState));
}
@Override
public InMemoryDataTreeSnapshot takeSnapshot() {
return state.newSnapshot();
}
@Override
public void commit(final DataTreeCandidate candidate) {
if (candidate instanceof NoopDataTreeCandidate) {
return;
}
Preconditions.checkArgument(candidate instanceof InMemoryDataTreeCandidate, "Invalid candidate class %s", 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, newState;
do {
currentState = state;
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);
} while (!STATE_UPDATER.compareAndSet(this, currentState, newState));
}
private static String simpleToString(final Object o) {
return o.getClass().getName() + "@" + Integer.toHexString(o.hashCode());
}
@Override
public YangInstanceIdentifier getRootPath() {
return treeConfig.getRootPath();
}
@Override
public String toString() {
return MoreObjects.toStringHelper(this).
add("object", super.toString()).
add("config", treeConfig).
add("state", state).
toString();
}
@Override
@Nonnull
protected TreeNode getTipRoot() {
return state.getRoot();
}
}