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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.data.init;
import static com.google.common.base.Preconditions.checkArgument;
import io.fd.honeycomb.translate.util.JsonUtils;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardOpenOption;
import javax.annotation.Nonnull;
import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
import org.opendaylight.controller.md.sal.common.api.data.TransactionCommitFailedException;
import org.opendaylight.controller.md.sal.dom.api.DOMDataBroker;
import org.opendaylight.controller.md.sal.dom.api.DOMDataWriteTransaction;
import org.opendaylight.controller.sal.core.api.model.SchemaService;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class RestoringInitializer implements DataTreeInitializer {
private static final Logger LOG = LoggerFactory.getLogger(RestoringInitializer.class);
private final SchemaService schemaService;
private final Path path;
private final DOMDataBroker dataTree;
private final RestorationType restorationType;
private final LogicalDatastoreType datastoreType;
public RestoringInitializer(@Nonnull final SchemaService schemaService,
@Nonnull final Path path,
@Nonnull final DOMDataBroker dataTree,
@Nonnull final RestorationType restorationType,
@Nonnull final LogicalDatastoreType datastoreType) {
this.schemaService = schemaService;
this.datastoreType = datastoreType;
this.path = checkStorage(path);
this.dataTree = dataTree;
this.restorationType = restorationType;
}
private Path checkStorage(final Path path) {
if (Files.exists(path)) {
checkArgument(!Files.isDirectory(path), "File %s is a directory", path);
checkArgument(Files.isReadable(path), "File %s is not readable", path);
}
return path;
}
@Override
public void initialize() throws InitializeException {
LOG.debug("Starting restoration of {} from {} using {}", dataTree, path, restorationType);
if(!Files.exists(path)) {
LOG.debug("Persist file {} does not exist. Skipping restoration", path);
return;
}
try {
final ContainerNode containerNode = JsonUtils
.readJsonRoot(schemaService.getGlobalContext(), Files.newInputStream(path, StandardOpenOption.READ));
final DOMDataWriteTransaction domDataWriteTransaction = dataTree.newWriteOnlyTransaction();
for (DataContainerChild<? extends YangInstanceIdentifier.PathArgument, ?> dataContainerChild : containerNode
.getValue()) {
final YangInstanceIdentifier iid = YangInstanceIdentifier.create(dataContainerChild.getIdentifier());
LOG.trace("Restoring {} from {}", iid, path);
switch (restorationType) {
case Merge:
domDataWriteTransaction.merge(datastoreType, iid, dataContainerChild);
break;
case Put:
domDataWriteTransaction.put(datastoreType, iid, dataContainerChild);
break;
default:
throw new InitializeException(
"Unable to initialize data using " + restorationType + " restoration strategy. Unsupported");
}
}
// Block here to prevent subsequent initializers processing before context is fully restored
domDataWriteTransaction.submit().checkedGet();
LOG.debug("Data from {} restored successfully", path);
} catch (IOException | TransactionCommitFailedException e) {
throw new InitializeException("Unable to restore data from " + path, e);
}
}
@Override
public void close() {}
}
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