2 * Copyright (c) 2016 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.controller.cluster.datastore;
10 import static com.google.common.base.Preconditions.checkArgument;
11 import static java.util.Objects.requireNonNull;
13 import java.util.Optional;
14 import org.opendaylight.controller.cluster.access.commands.ExistsTransactionRequest;
15 import org.opendaylight.controller.cluster.access.commands.ExistsTransactionSuccess;
16 import org.opendaylight.controller.cluster.access.commands.ModifyTransactionRequest;
17 import org.opendaylight.controller.cluster.access.commands.ModifyTransactionSuccess;
18 import org.opendaylight.controller.cluster.access.commands.PersistenceProtocol;
19 import org.opendaylight.controller.cluster.access.commands.ReadTransactionRequest;
20 import org.opendaylight.controller.cluster.access.commands.ReadTransactionSuccess;
21 import org.opendaylight.controller.cluster.access.commands.TransactionRequest;
22 import org.opendaylight.controller.cluster.access.commands.TransactionSuccess;
23 import org.opendaylight.controller.cluster.access.concepts.RequestEnvelope;
24 import org.opendaylight.controller.cluster.access.concepts.RequestException;
25 import org.opendaylight.controller.cluster.access.concepts.UnsupportedRequestException;
26 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
27 import org.slf4j.Logger;
28 import org.slf4j.LoggerFactory;
31 * Read-only frontend transaction state as observed by the shard leader. This class is NOT thread-safe.
33 * @author Robert Varga
35 final class FrontendReadOnlyTransaction extends FrontendTransaction {
36 private static final Logger LOG = LoggerFactory.getLogger(FrontendReadOnlyTransaction.class);
38 private final ReadOnlyShardDataTreeTransaction openTransaction;
40 private FrontendReadOnlyTransaction(final AbstractFrontendHistory history,
41 final ReadOnlyShardDataTreeTransaction transaction) {
42 super(history, transaction.getIdentifier());
43 this.openTransaction = requireNonNull(transaction);
46 static FrontendReadOnlyTransaction create(final AbstractFrontendHistory history,
47 final ReadOnlyShardDataTreeTransaction transaction) {
48 return new FrontendReadOnlyTransaction(history, transaction);
51 // Sequence has already been checked
53 TransactionSuccess<?> doHandleRequest(final TransactionRequest<?> request, final RequestEnvelope envelope,
54 final long now) throws RequestException {
55 if (request instanceof ExistsTransactionRequest) {
56 return handleExistsTransaction((ExistsTransactionRequest) request);
57 } else if (request instanceof ReadTransactionRequest) {
58 return handleReadTransaction((ReadTransactionRequest) request);
59 } else if (request instanceof ModifyTransactionRequest) {
60 handleModifyTransaction((ModifyTransactionRequest) request, envelope, now);
63 LOG.warn("Rejecting unsupported request {}", request);
64 throw new UnsupportedRequestException(request);
73 private void handleModifyTransaction(final ModifyTransactionRequest request, final RequestEnvelope envelope,
75 // The only valid request here is with abort protocol
76 final Optional<PersistenceProtocol> optProto = request.getPersistenceProtocol();
77 checkArgument(optProto.isPresent(), "Commit protocol is missing in %s", request);
78 checkArgument(optProto.get() == PersistenceProtocol.ABORT, "Unsupported commit protocol in %s", request);
79 openTransaction.abort(() -> recordAndSendSuccess(envelope, now,
80 new ModifyTransactionSuccess(request.getTarget(), request.getSequence())));
83 private ExistsTransactionSuccess handleExistsTransaction(final ExistsTransactionRequest request) {
84 final Optional<NormalizedNode<?, ?>> data = openTransaction.getSnapshot().readNode(request.getPath());
85 return recordSuccess(request.getSequence(), new ExistsTransactionSuccess(openTransaction.getIdentifier(),
86 request.getSequence(), data.isPresent()));
89 private ReadTransactionSuccess handleReadTransaction(final ReadTransactionRequest request) {
90 final Optional<NormalizedNode<?, ?>> data = openTransaction.getSnapshot().readNode(request.getPath());
91 return recordSuccess(request.getSequence(), new ReadTransactionSuccess(openTransaction.getIdentifier(),
92 request.getSequence(), data));