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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 com.google.common.base.Function;
import com.google.common.base.Optional;
import com.google.common.base.Preconditions;
import com.google.common.util.concurrent.CheckedFuture;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import io.fd.honeycomb.v3po.data.ReadableDataTree;
import io.fd.honeycomb.v3po.data.DataTreeSnapshot;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
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.yangtools.yang.data.api.YangInstanceIdentifier;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
final class ReadOnlyTransaction implements DOMDataReadOnlyTransaction {
private static final Logger LOG = LoggerFactory.getLogger(ReadOnlyTransaction.class);
private volatile ReadableDataTree operationalData;
private volatile DataTreeSnapshot configSnapshot;
ReadOnlyTransaction(@Nonnull final ReadableDataTree operationalData,
@Nonnull final DataTreeSnapshot configSnapshot) {
this.operationalData = Preconditions.checkNotNull(operationalData, "operationalData should not be null");
this.configSnapshot = Preconditions.checkNotNull(configSnapshot, "config should not be null");
}
@Override
public void close() {
configSnapshot = null;
operationalData = null;
}
@Override
public CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> read(
final LogicalDatastoreType store,
final YangInstanceIdentifier path) {
LOG.debug("ReadOnlyTransaction.read(), store={}, path={}", store, path);
Preconditions.checkState(configSnapshot != null, "Transaction was closed");
if (store == LogicalDatastoreType.OPERATIONAL) {
return operationalData.read(path);
} else {
return configSnapshot.read(path);
}
}
@Override
public CheckedFuture<Boolean, ReadFailedException> exists(final LogicalDatastoreType store,
final YangInstanceIdentifier path) {
LOG.debug("ReadOnlyTransaction.exists() store={}, path={}", store, path);
ListenableFuture<Boolean> listenableFuture = Futures.transform(read(store, path), IS_NODE_PRESENT);
return Futures.makeChecked(listenableFuture, ANY_EX_TO_READ_FAILED_EXCEPTION_MAPPER);
}
@Nonnull
@Override
public Object getIdentifier() {
return this;
}
private static final Function<? super Optional<NormalizedNode<?, ?>>, ? extends Boolean> IS_NODE_PRESENT =
new Function<Optional<NormalizedNode<?, ?>>, Boolean>() {
@Nullable
@Override
public Boolean apply(@Nullable final Optional<NormalizedNode<?, ?>> input) {
return input == null
? Boolean.FALSE
: input.isPresent();
}
};
private static final Function<? super Exception, ReadFailedException> ANY_EX_TO_READ_FAILED_EXCEPTION_MAPPER =
new Function<Exception, ReadFailedException>() {
@Override
public ReadFailedException apply(@Nullable final Exception e) {
return new ReadFailedException("Exists failed", e);
}
};
}
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