/*
* Copyright (c) 2016 Cisco Systems, Inc. and others. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package org.opendaylight.controller.cluster.databroker;
import com.google.common.base.Optional;
import com.google.common.util.concurrent.CheckedFuture;
import com.google.common.util.concurrent.Futures;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
import javax.annotation.Nullable;
import org.opendaylight.controller.cluster.databroker.actors.dds.ClientSnapshot;
import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
import org.opendaylight.controller.sal.core.spi.data.DOMStoreReadTransaction;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
/**
* An implementation of {@link DOMStoreReadTransaction} backed by a {@link ClientSnapshot}. Used for standalone
* transactions.
*
* @author Robert Varga
*/
final class ClientBackedReadTransaction extends ClientBackedTransaction<ClientSnapshot>
implements DOMStoreReadTransaction {
private static final AtomicReferenceFieldUpdater<ClientBackedReadTransaction, ClientBackedTransactionChain>
PARENT_UPDATER = AtomicReferenceFieldUpdater.newUpdater(ClientBackedReadTransaction.class,
ClientBackedTransactionChain.class, "parent");
@SuppressWarnings("unused")
private volatile ClientBackedTransactionChain parent;
ClientBackedReadTransaction(final ClientSnapshot delegate, @Nullable final ClientBackedTransactionChain parent) {
super(delegate);
this.parent = parent;
}
@Override
public CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> read(final YangInstanceIdentifier path) {
return Futures.makeChecked(delegate().read(path), ReadFailedException.MAPPER);
}
@Override
public CheckedFuture<Boolean, ReadFailedException> exists(final YangInstanceIdentifier path) {
return Futures.makeChecked(delegate().exists(path), ReadFailedException.MAPPER);
}
@Override
public void close() {
super.close();
final ClientBackedTransactionChain local = PARENT_UPDATER.getAndSet(this, null);
if (local != null) {
local.snapshotClosed(delegate());
}
}
}