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 com.google.common.base.Optional;
11 import com.google.common.base.Preconditions;
12 import javax.annotation.Nullable;
13 import javax.annotation.concurrent.NotThreadSafe;
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.ReadTransactionRequest;
17 import org.opendaylight.controller.cluster.access.commands.ReadTransactionSuccess;
18 import org.opendaylight.controller.cluster.access.commands.TransactionAbortRequest;
19 import org.opendaylight.controller.cluster.access.commands.TransactionAbortSuccess;
20 import org.opendaylight.controller.cluster.access.commands.TransactionPurgeRequest;
21 import org.opendaylight.controller.cluster.access.commands.TransactionPurgeResponse;
22 import org.opendaylight.controller.cluster.access.commands.TransactionRequest;
23 import org.opendaylight.controller.cluster.access.commands.TransactionSuccess;
24 import org.opendaylight.controller.cluster.access.concepts.RequestEnvelope;
25 import org.opendaylight.controller.cluster.access.concepts.RequestException;
26 import org.opendaylight.controller.cluster.access.concepts.UnsupportedRequestException;
27 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
30 * Read-only frontend transaction state as observed by the shard leader.
32 * @author Robert Varga
35 final class FrontendReadOnlyTransaction extends FrontendTransaction {
36 private final ReadOnlyShardDataTreeTransaction openTransaction;
38 private FrontendReadOnlyTransaction(final AbstractFrontendHistory history,
39 final ReadOnlyShardDataTreeTransaction transaction) {
40 super(history, transaction.getIdentifier());
41 this.openTransaction = Preconditions.checkNotNull(transaction);
44 static FrontendReadOnlyTransaction create(final AbstractFrontendHistory history,
45 final ReadOnlyShardDataTreeTransaction transaction) {
46 return new FrontendReadOnlyTransaction(history, transaction);
49 // Sequence has already been checked
51 @Nullable TransactionSuccess<?> handleRequest(final TransactionRequest<?> request, final RequestEnvelope envelope,
52 final long now) throws RequestException {
53 if (request instanceof ExistsTransactionRequest) {
54 return handleExistsTransaction((ExistsTransactionRequest) request);
55 } else if (request instanceof ReadTransactionRequest) {
56 return handleReadTransaction((ReadTransactionRequest) request);
57 } else if (request instanceof TransactionAbortRequest) {
58 return handleTransactionAbort((TransactionAbortRequest) request, envelope, now);
59 } else if (request instanceof TransactionPurgeRequest) {
61 return new TransactionPurgeResponse(request.getTarget(), request.getSequence());
63 throw new UnsupportedRequestException(request);
67 private TransactionSuccess<?> handleTransactionAbort(final TransactionAbortRequest request,
68 final RequestEnvelope envelope, final long now) throws RequestException {
69 openTransaction.abort();
70 return new TransactionAbortSuccess(openTransaction.getIdentifier(), request.getSequence());
73 private ExistsTransactionSuccess handleExistsTransaction(final ExistsTransactionRequest request)
74 throws RequestException {
75 final Optional<NormalizedNode<?, ?>> data = openTransaction.getSnapshot().readNode(request.getPath());
76 return recordSuccess(request.getSequence(), new ExistsTransactionSuccess(openTransaction.getIdentifier(),
77 request.getSequence(), data.isPresent()));
80 private ReadTransactionSuccess handleReadTransaction(final ReadTransactionRequest request)
81 throws RequestException {
82 final Optional<NormalizedNode<?, ?>> data = openTransaction.getSnapshot().readNode(request.getPath());
83 return recordSuccess(request.getSequence(), new ReadTransactionSuccess(openTransaction.getIdentifier(),
84 request.getSequence(), data));