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/*
* Copyright (c) 2016 Cisco and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.fd.honeycomb.v3po.data.impl;
import static com.google.common.base.Preconditions.checkNotNull;
import static io.fd.honeycomb.v3po.data.impl.DataTreeUtils.childrenFromNormalized;
import com.google.common.base.Optional;
import com.google.common.util.concurrent.CheckedFuture;
import com.google.common.util.concurrent.Futures;
import io.fd.honeycomb.v3po.data.DataTreeSnapshot;
import io.fd.honeycomb.v3po.data.ModifiableDataTree;
import io.fd.honeycomb.v3po.data.ReadableDataTree;
import io.fd.honeycomb.v3po.translate.TranslationException;
import io.fd.honeycomb.v3po.translate.util.write.TransactionWriteContext;
import io.fd.honeycomb.v3po.translate.write.WriteContext;
import io.fd.honeycomb.v3po.translate.write.WriterRegistry;
import java.util.Collections;
import java.util.Map;
import javax.annotation.Nonnull;
import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
import org.opendaylight.controller.md.sal.dom.api.DOMDataReadOnlyTransaction;
import org.opendaylight.yangtools.binding.data.codec.api.BindingNormalizedNodeSerializer;
import org.opendaylight.yangtools.yang.binding.DataObject;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
import org.opendaylight.yangtools.yang.data.api.schema.DataContainerNode;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
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.DataTreeCandidateNode;
import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeModification;
import org.opendaylight.yangtools.yang.data.api.schema.tree.DataValidationFailedException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* DataTree implementation for configuration data.
*/
public final class ConfigDataTree implements ModifiableDataTree {
private static final Logger LOG = LoggerFactory.getLogger(ConfigDataTree.class);
private final BindingNormalizedNodeSerializer serializer;
private final DataTree dataTree;
private final WriterRegistry writerRegistry;
public static final ReadableDataTree EMPTY_OPERATIONAL = new ReadableDataTree() {
@Override
public CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> read(
@Nonnull final YangInstanceIdentifier path) {
return Futures.immediateCheckedFuture(Optional.<NormalizedNode<?, ?>>absent());
}
};
/**
* Creates configuration data tree instance.
*
* @param serializer service for serialization between Java Binding Data representation and NormalizedNode
* representation.
* @param dataTree data tree for configuration data representation
* @param writerRegistry service for translation between Java Binding Data and data provider, capable of performing
* bulk updates.
*/
public ConfigDataTree(@Nonnull final BindingNormalizedNodeSerializer serializer,
@Nonnull final DataTree dataTree, @Nonnull final WriterRegistry writerRegistry) {
this.serializer = checkNotNull(serializer, "serializer should not be null");
this.dataTree = checkNotNull(dataTree, "dataTree should not be null");
this.writerRegistry = checkNotNull(writerRegistry, "writerRegistry should not be null");
}
@Override
public DataTreeSnapshot takeSnapshot() {
return new ConfigSnapshot(dataTree.takeSnapshot());
}
@Override
public void modify(final DataTreeModification modification)
throws DataValidationFailedException, TranslationException {
LOG.debug("ConfigDataTree.modify");
dataTree.validate(modification);
final DataTreeCandidate candidate = dataTree.prepare(modification);
final DataTreeCandidateNode rootNode = candidate.getRootNode();
final YangInstanceIdentifier rootPath = candidate.getRootPath();
final Optional<NormalizedNode<?, ?>> normalizedDataBefore = rootNode.getDataBefore();
final Optional<NormalizedNode<?, ?>> normalizedDataAfter = rootNode.getDataAfter();
LOG.debug("ConfigDataTree.modify() rootPath={}, rootNode={}, dataBefore={}, dataAfter={}",
rootPath, rootNode, normalizedDataBefore, normalizedDataAfter);
final Map<InstanceIdentifier<?>, DataObject> nodesBefore = extractNetconfData(normalizedDataBefore);
LOG.debug("ConfigDataTree.modify() extracted nodesBefore={}", nodesBefore.keySet());
final Map<InstanceIdentifier<?>, DataObject> nodesAfter = extractNetconfData(normalizedDataAfter);
LOG.debug("ConfigDataTree.modify() extracted nodesAfter={}", nodesAfter.keySet());
final DOMDataReadOnlyTransaction beforeTx = new ReadOnlyTransaction(EMPTY_OPERATIONAL, takeSnapshot());
final ConfigSnapshot modificationSnapshot = new ConfigSnapshot(modification);
final DOMDataReadOnlyTransaction afterTx = new ReadOnlyTransaction(EMPTY_OPERATIONAL, modificationSnapshot);
try (final WriteContext ctx = new TransactionWriteContext(serializer, beforeTx, afterTx)) {
writerRegistry.update(nodesBefore, nodesAfter, ctx);
} catch (io.fd.honeycomb.v3po.translate.write.WriterRegistry.BulkUpdateException e) {
LOG.warn("Failed to apply all changes", e);
LOG.info("Trying to revert successful changes for current transaction");
try {
e.revertChanges();
LOG.info("Changes successfully reverted");
} catch (io.fd.honeycomb.v3po.translate.write.WriterRegistry.Reverter.RevertFailedException revertFailedException) {
// fail with failed revert
LOG.error("Failed to revert successful changes", revertFailedException);
throw revertFailedException;
}
throw e; // fail with success revert
} catch (TranslationException e) {
LOG.error("Error while processing data change (before={}, after={})", nodesBefore, nodesAfter, e);
throw e;
}
dataTree.commit(candidate);
}
private Map<InstanceIdentifier<?>, DataObject> extractNetconfData(
final Optional<NormalizedNode<?, ?>> parentOptional) {
if (parentOptional.isPresent()) {
final DataContainerNode parent = (DataContainerNode) parentOptional.get();
return childrenFromNormalized(parent, serializer);
}
return Collections.emptyMap();
}
private final static class ConfigSnapshot implements DataTreeSnapshot {
private final org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeSnapshot snapshot;
ConfigSnapshot(@Nonnull final org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeSnapshot snapshot) {
this.snapshot = snapshot;
}
@Override
public CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> read(
@Nonnull final YangInstanceIdentifier path) {
final Optional<NormalizedNode<?, ?>> node = snapshot.readNode(path);
if (LOG.isTraceEnabled() && node.isPresent()) {
LOG.trace("ConfigSnapshot.read: {}", node.get());
}
return Futures.immediateCheckedFuture(node);
}
@Override
public DataTreeModification newModification() {
return snapshot.newModification();
}
}
}
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