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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.translate.util.write;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.base.Function;
import com.google.common.collect.Collections2;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import io.fd.honeycomb.v3po.translate.util.RWUtils;
import io.fd.honeycomb.v3po.translate.write.WriteContext;
import io.fd.honeycomb.v3po.translate.write.WriteFailedException;
import io.fd.honeycomb.v3po.translate.write.Writer;
import io.fd.honeycomb.v3po.translate.write.WriterRegistry;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import org.opendaylight.yangtools.yang.binding.DataObject;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Simple writer registry able to perform and aggregated write (ROOT write) on top of all provided writers. Also able to
* delegate a specific write to one of the delegate writers.
*
* This could serve as a utility to hold & hide all available writers in upper layers.
*/
public final class DelegatingWriterRegistry implements WriterRegistry {
private static final Logger LOG = LoggerFactory.getLogger(DelegatingWriterRegistry.class);
private final Map<Class<? extends DataObject>, Writer<? extends DataObject>> rootWriters;
/**
* Create new {@link DelegatingWriterRegistry}
*
* @param rootWriters List of delegate writers
*/
public DelegatingWriterRegistry(@Nonnull final List<Writer<? extends DataObject>> rootWriters) {
this.rootWriters = RWUtils.uniqueLinkedIndex(checkNotNull(rootWriters), RWUtils.MANAGER_CLASS_FUNCTION);
}
/**
* @throws UnsupportedOperationException This getter is not supported for writer registry since it does not manage a
* specific node type
*/
@Nonnull
@Override
public InstanceIdentifier<DataObject> getManagedDataObjectType() {
throw new UnsupportedOperationException("Root registry has no type");
}
@Override
public void update(@Nonnull final InstanceIdentifier<? extends DataObject> id,
@Nullable final DataObject dataBefore,
@Nullable final DataObject dataAfter,
@Nonnull final WriteContext ctx) throws WriteFailedException {
final InstanceIdentifier.PathArgument first = checkNotNull(
Iterables.getFirst(id.getPathArguments(), null), "Empty id");
final Writer<? extends DataObject> writer = rootWriters.get(first.getType());
checkNotNull(writer,
"Unable to write %s. Missing writer. Current writers for: %s", id, rootWriters.keySet());
writer.update(id, dataBefore, dataAfter, ctx);
}
@Override
public void update(@Nonnull final Map<InstanceIdentifier<?>, DataObject> nodesBefore,
@Nonnull final Map<InstanceIdentifier<?>, DataObject> nodesAfter,
@Nonnull final WriteContext ctx) throws WriteFailedException {
checkAllWritersPresent(nodesBefore);
checkAllWritersPresent(nodesAfter);
final List<InstanceIdentifier<?>> processedNodes = Lists.newArrayList();
for (Map.Entry<Class<? extends DataObject>, Writer<? extends DataObject>> rootWriterEntry : rootWriters
.entrySet()) {
final InstanceIdentifier<? extends DataObject> id = rootWriterEntry.getValue().getManagedDataObjectType();
final DataObject dataBefore = nodesBefore.get(id);
final DataObject dataAfter = nodesAfter.get(id);
// No change to current writer
if (dataBefore == null && dataAfter == null) {
continue;
}
LOG.debug("ChangesProcessor.applyChanges() processing dataBefore={}, dataAfter={}", dataBefore, dataAfter);
try {
update(id, dataBefore, dataAfter, ctx);
processedNodes.add(id);
} catch (Exception e) {
LOG.error("Error while processing data change of: {} (before={}, after={})",
id, dataBefore, dataAfter, e);
throw new BulkUpdateException(
id, new ReverterImpl(this, processedNodes, nodesBefore, nodesAfter, ctx), e);
}
}
}
private void checkAllWritersPresent(final @Nonnull Map<InstanceIdentifier<?>, DataObject> nodesBefore) {
final Set<Class<? extends DataObject>> nodesBeforeClasses =
Sets.newHashSet(Collections2.transform(nodesBefore.keySet(),
(Function<InstanceIdentifier<?>, Class<? extends DataObject>>) InstanceIdentifier::getTargetType));
checkArgument(rootWriters.keySet().containsAll(nodesBeforeClasses),
"Unable to handle all changes. Missing dedicated writers for: %s",
Sets.difference(nodesBeforeClasses, rootWriters.keySet()));
}
private static final class ReverterImpl implements Reverter {
private final WriterRegistry delegatingWriterRegistry;
private final List<InstanceIdentifier<?>> processedNodes;
private final Map<InstanceIdentifier<?>, DataObject> nodesBefore;
private final Map<InstanceIdentifier<?>, DataObject> nodesAfter;
private final WriteContext ctx;
ReverterImpl(final WriterRegistry delegatingWriterRegistry,
final List<InstanceIdentifier<?>> processedNodes,
final Map<InstanceIdentifier<?>, DataObject> nodesBefore,
final Map<InstanceIdentifier<?>, DataObject> nodesAfter, final WriteContext ctx) {
this.delegatingWriterRegistry = delegatingWriterRegistry;
this.processedNodes = processedNodes;
this.nodesBefore = nodesBefore;
this.nodesAfter = nodesAfter;
this.ctx = ctx;
}
@Override
public void revert() throws RevertFailedException {
final LinkedList<InstanceIdentifier<?>> notReverted = new LinkedList<>(processedNodes);
while (notReverted.size() > 0) {
final InstanceIdentifier<?> node = notReverted.peekLast();
LOG.debug("ChangesProcessor.revertChanges() processing node={}", node);
final DataObject dataBefore = nodesBefore.get(node);
final DataObject dataAfter = nodesAfter.get(node);
// revert a change by invoking writer with reordered arguments
try {
delegatingWriterRegistry.update(node, dataAfter, dataBefore, ctx);
notReverted.removeLast(); // change was successfully reverted
} catch (Exception e) {
throw new RevertFailedException(notReverted, e);
}
}
}
}
}
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