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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.impl.trans.w.util;
import com.google.common.base.Optional;
import com.google.common.util.concurrent.CheckedFuture;
import io.fd.honeycomb.v3po.impl.trans.util.Context;
import io.fd.honeycomb.v3po.impl.trans.w.WriteContext;
import java.util.Map;
import javax.annotation.Nonnull;
import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
import org.opendaylight.controller.md.sal.dom.api.DOMDataReadOnlyTransaction;
import org.opendaylight.mdsal.binding.dom.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.NormalizedNode;
/**
* Transaction based WriteContext
*/
public final class TransactionWriteContext implements WriteContext {
private final DOMDataReadOnlyTransaction beforeTx;
private final DOMDataReadOnlyTransaction afterTx;
private final Context ctx;
private final BindingNormalizedNodeSerializer serializer;
public TransactionWriteContext(final BindingNormalizedNodeSerializer serializer,
final DOMDataReadOnlyTransaction beforeTx,
final DOMDataReadOnlyTransaction afterTx) {
this.serializer = serializer;
this.beforeTx = beforeTx;
this.afterTx = afterTx;
this.ctx = new Context();
}
// TODO make this asynchronous
@Override
public Optional<DataObject> readBefore(@Nonnull final InstanceIdentifier<? extends DataObject> currentId) {
return read(currentId, beforeTx);
}
private Optional<DataObject> read(final InstanceIdentifier<? extends DataObject> currentId,
final DOMDataReadOnlyTransaction tx) {
final YangInstanceIdentifier path = serializer.toYangInstanceIdentifier(currentId);
final CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> read =
tx.read(LogicalDatastoreType.CONFIGURATION, path);
try {
// TODO once the APIs are asynchronous use just Futures.transform
final Optional<NormalizedNode<?, ?>> optional = read.checkedGet();
if (!optional.isPresent()) {
return Optional.absent();
}
final NormalizedNode<?, ?> data = optional.get();
final Map.Entry<InstanceIdentifier<?>, DataObject> entry = serializer.fromNormalizedNode(path, data);
return Optional.of(entry.getValue());
} catch (ReadFailedException e) {
throw new IllegalStateException("Unable to perform read", e);
}
}
@Override
public Optional<DataObject> readAfter(@Nonnull final InstanceIdentifier<? extends DataObject> currentId) {
return read(currentId, afterTx);
}
@Override
public Context getContext() {
return ctx;
}
/**
* Does not close the transactions
*/
@Override
public void close() {
ctx.close();
}
}
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