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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.impl;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkState;
import static java.util.Objects.requireNonNull;
import com.google.common.base.Function;
import com.google.common.base.Optional;
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.data.ReadableDataManager;
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);
@Nullable
private ReadableDataManager operationalData;
@Nullable
private ReadableDataManager configSnapshot;
private boolean closed = false;
/**
* @param configData config data tree manager. Null if config reads are not to be supported
* @param operationalData operational data tree manager. Null if operational reads are not to be supported
*/
private ReadOnlyTransaction(@Nullable final ReadableDataManager configData,
@Nullable final ReadableDataManager operationalData) {
this.configSnapshot = configData;
this.operationalData = operationalData;
}
@Override
public synchronized void close() {
closed = true;
configSnapshot = null;
operationalData = null;
}
@Override
public synchronized CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> read(
final LogicalDatastoreType store,
final YangInstanceIdentifier path) {
LOG.debug("ReadOnlyTransaction.read(), store={}, path={}", store, path);
checkState(!closed, "Transaction has been closed");
if (store == LogicalDatastoreType.OPERATIONAL) {
checkArgument(operationalData != null, "{} reads not supported", store);
return operationalData.read(path);
} else {
checkArgument(configSnapshot != null, "{} reads not supported", store);
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;
}
@Nonnull
static ReadOnlyTransaction createOperationalOnly(@Nonnull final ReadableDataManager operationalData) {
return new ReadOnlyTransaction(null, requireNonNull(operationalData));
}
@Nonnull
static ReadOnlyTransaction createConfigOnly(@Nonnull final ReadableDataManager configData) {
return new ReadOnlyTransaction(requireNonNull(configData), null);
}
@Nonnull
static ReadOnlyTransaction create(@Nonnull final ReadableDataManager configData,
@Nonnull final ReadableDataManager operationalData) {
return new ReadOnlyTransaction(requireNonNull(configData), requireNonNull(operationalData));
}
private static final Function<? super Optional<NormalizedNode<?, ?>>, ? extends Boolean> IS_NODE_PRESENT =
(Function<Optional<NormalizedNode<?, ?>>, Boolean>) input -> input == null ? Boolean.FALSE : input.isPresent();
private static final Function<? super Exception, ReadFailedException> ANY_EX_TO_READ_FAILED_EXCEPTION_MAPPER =
(Function<Exception, ReadFailedException>) e -> new ReadFailedException("Exists failed", e);
}
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