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/*
* Copyright (c) 2017 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.bgp.translate.impl;
import com.google.common.base.Preconditions;
import io.fd.honeycomb.translate.bgp.RouteWriter;
import io.fd.honeycomb.translate.write.WriteFailedException;
import java.util.Collection;
import javax.annotation.Nonnull;
import org.opendaylight.controller.md.sal.binding.api.DataObjectModification;
import org.opendaylight.controller.md.sal.binding.api.DataTreeChangeListener;
import org.opendaylight.controller.md.sal.binding.api.DataTreeIdentifier;
import org.opendaylight.controller.md.sal.binding.api.DataTreeModification;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.Route;
import org.opendaylight.yangtools.yang.binding.DataObject;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
final class LocRibChangeListener implements DataTreeChangeListener<Route> {
private static final Logger LOG = LoggerFactory.getLogger(LocRibChangeListener.class);
private final RouteWriter writer;
LocRibChangeListener(final RouteWriter writer) {
this.writer = writer;
}
@Override
public void onDataTreeChanged(@Nonnull final Collection<DataTreeModification<Route>> changes) {
for (DataTreeModification<Route> change : changes) {
final DataObjectModification<Route> rootNode = change.getRootNode();
final DataTreeIdentifier<Route> rootPath = change.getRootPath();
final Route dataBefore = rootNode.getDataBefore();
final Route dataAfter = rootNode.getDataAfter();
LOG.trace("Received LocRib change({}): before={} after={}", rootNode.getModificationType(), dataBefore, dataAfter);
try {
processChange(rootPath.getRootIdentifier(), dataBefore, dataAfter);
} catch (WriteFailedException e) {
LOG.warn("Route translation failed", e);
}
}
}
@SuppressWarnings("unchecked")
private void processChange(final InstanceIdentifier<Route> id, final Route dataBefore, final Route dataAfter) throws WriteFailedException {
if (isCreate(dataBefore, dataAfter)) {
writer.create(id, dataAfter);
} else if (isDelete(dataBefore, dataAfter)) {
writer.delete(id, dataBefore);
} else {
Preconditions.checkArgument(dataBefore != null && dataAfter != null, "No data to process");
writer.update(id, dataBefore, dataAfter);
}
}
private static boolean isCreate(final DataObject dataBefore, final DataObject dataAfter) {
return dataBefore == null && dataAfter != null;
}
private static boolean isDelete(final DataObject dataBefore, final DataObject dataAfter) {
return dataAfter == null && dataBefore != null;
}
}
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