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.databroker.actors.dds;
10 import static java.util.Objects.requireNonNull;
12 import com.google.common.util.concurrent.FluentFuture;
13 import java.util.Optional;
14 import java.util.function.Consumer;
15 import org.eclipse.jdt.annotation.NonNull;
16 import org.eclipse.jdt.annotation.Nullable;
17 import org.opendaylight.controller.cluster.access.commands.AbortLocalTransactionRequest;
18 import org.opendaylight.controller.cluster.access.commands.AbstractLocalTransactionRequest;
19 import org.opendaylight.controller.cluster.access.commands.CommitLocalTransactionRequest;
20 import org.opendaylight.controller.cluster.access.commands.ExistsTransactionRequest;
21 import org.opendaylight.controller.cluster.access.commands.ExistsTransactionSuccess;
22 import org.opendaylight.controller.cluster.access.commands.IncrementTransactionSequenceRequest;
23 import org.opendaylight.controller.cluster.access.commands.ModifyTransactionRequest;
24 import org.opendaylight.controller.cluster.access.commands.ReadTransactionRequest;
25 import org.opendaylight.controller.cluster.access.commands.ReadTransactionSuccess;
26 import org.opendaylight.controller.cluster.access.commands.TransactionPurgeRequest;
27 import org.opendaylight.controller.cluster.access.commands.TransactionRequest;
28 import org.opendaylight.controller.cluster.access.concepts.Response;
29 import org.opendaylight.controller.cluster.access.concepts.TransactionIdentifier;
30 import org.opendaylight.controller.cluster.datastore.util.AbstractDataTreeModificationCursor;
31 import org.opendaylight.yangtools.util.concurrent.FluentFutures;
32 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
33 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
34 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
35 import org.opendaylight.yangtools.yang.data.tree.api.DataTreeModification;
36 import org.opendaylight.yangtools.yang.data.tree.api.DataTreeSnapshot;
37 import org.slf4j.Logger;
38 import org.slf4j.LoggerFactory;
41 * An {@link AbstractProxyTransaction} for dispatching a transaction towards a shard leader which is co-located with
42 * the client instance. This class is NOT thread-safe.
45 * It requires a {@link DataTreeSnapshot}, which is used to instantiated a new {@link DataTreeModification}. Operations
46 * are then performed on this modification and once the transaction is submitted, the modification is sent to the shard
50 * This class is not thread-safe as usual with transactions. Since it does not interact with the backend until the
51 * transaction is submitted, at which point this class gets out of the picture, this is not a cause for concern.
53 * @author Robert Varga
55 abstract class LocalProxyTransaction extends AbstractProxyTransaction {
56 private static final Logger LOG = LoggerFactory.getLogger(LocalProxyTransaction.class);
58 private final TransactionIdentifier identifier;
60 LocalProxyTransaction(final ProxyHistory parent, final TransactionIdentifier identifier, final boolean isDone) {
61 super(parent, isDone);
62 this.identifier = requireNonNull(identifier);
66 public final TransactionIdentifier getIdentifier() {
70 abstract @NonNull DataTreeSnapshot readOnlyView();
72 abstract void applyForwardedModifyTransactionRequest(ModifyTransactionRequest request,
73 @Nullable Consumer<Response<?, ?>> callback);
75 abstract void replayModifyTransactionRequest(ModifyTransactionRequest request,
76 @Nullable Consumer<Response<?, ?>> callback, long enqueuedTicks);
79 final FluentFuture<Boolean> doExists(final YangInstanceIdentifier path) {
80 return FluentFutures.immediateBooleanFluentFuture(readOnlyView().readNode(path).isPresent());
84 final FluentFuture<Optional<NormalizedNode>> doRead(final YangInstanceIdentifier path) {
85 return FluentFutures.immediateFluentFuture(readOnlyView().readNode(path));
89 final AbortLocalTransactionRequest abortRequest() {
90 return new AbortLocalTransactionRequest(identifier, localActor());
94 void handleReplayedLocalRequest(final AbstractLocalTransactionRequest<?> request,
95 final Consumer<Response<?, ?>> callback, final long enqueuedTicks) {
96 if (request instanceof AbortLocalTransactionRequest) {
97 enqueueAbort(request, callback, enqueuedTicks);
99 throw unhandledRequest(request);
103 private boolean handleReadRequest(final TransactionRequest<?> request, final Consumer<Response<?, ?>> callback) {
104 // Note we delay completion of read requests to limit the scope at which the client can run, as they have
105 // listeners, which we do not want to execute while we are reconnecting.
106 if (request instanceof ReadTransactionRequest) {
107 if (callback != null) {
108 final YangInstanceIdentifier path = ((ReadTransactionRequest) request).getPath();
109 final Optional<NormalizedNode> result = readOnlyView().readNode(path);
110 executeInActor(() -> callback.accept(new ReadTransactionSuccess(request.getTarget(),
111 request.getSequence(), result)));
114 } else if (request instanceof ExistsTransactionRequest) {
115 if (callback != null) {
116 final YangInstanceIdentifier path = ((ExistsTransactionRequest) request).getPath();
117 final boolean result = readOnlyView().readNode(path).isPresent();
118 executeInActor(() -> callback.accept(new ExistsTransactionSuccess(request.getTarget(),
119 request.getSequence(), result)));
128 void handleReplayedRemoteRequest(final TransactionRequest<?> request, final Consumer<Response<?, ?>> callback,
129 final long enqueuedTicks) {
130 if (request instanceof ModifyTransactionRequest) {
131 replayModifyTransactionRequest((ModifyTransactionRequest) request, callback, enqueuedTicks);
132 } else if (handleReadRequest(request, callback)) {
134 } else if (request instanceof TransactionPurgeRequest) {
135 enqueuePurge(callback, enqueuedTicks);
136 } else if (request instanceof IncrementTransactionSequenceRequest) {
137 // Local transactions do not have non-replayable requests which would be visible to the backend,
138 // hence we can skip sequence increments.
139 LOG.debug("Not replaying {}", request);
141 throw unhandledRequest(request);
146 * Remote-to-local equivalent of {@link #handleReplayedRemoteRequest(TransactionRequest, Consumer, long)},
147 * except it is invoked in the forwarding path from
148 * {@link RemoteProxyTransaction#forwardToLocal(LocalProxyTransaction, TransactionRequest, Consumer)}.
150 * @param request Forwarded request
151 * @param callback Callback to be invoked once the request completes
153 void handleForwardedRemoteRequest(final TransactionRequest<?> request, final Consumer<Response<?, ?>> callback) {
154 if (request instanceof ModifyTransactionRequest) {
155 applyForwardedModifyTransactionRequest((ModifyTransactionRequest) request, callback);
156 } else if (handleReadRequest(request, callback)) {
158 } else if (request instanceof TransactionPurgeRequest) {
159 enqueuePurge(callback);
161 throw unhandledRequest(request);
166 final void forwardToRemote(final RemoteProxyTransaction successor, final TransactionRequest<?> request,
167 final Consumer<Response<?, ?>> callback) {
168 if (request instanceof CommitLocalTransactionRequest) {
169 final CommitLocalTransactionRequest req = (CommitLocalTransactionRequest) request;
170 final DataTreeModification mod = req.getModification();
172 LOG.debug("Applying modification {} to successor {}", mod, successor);
173 mod.applyToCursor(new AbstractDataTreeModificationCursor() {
175 public void write(final PathArgument child, final NormalizedNode data) {
176 successor.write(current().node(child), data);
180 public void merge(final PathArgument child, final NormalizedNode data) {
181 successor.merge(current().node(child), data);
185 public void delete(final PathArgument child) {
186 successor.delete(current().node(child));
190 successor.sealOnly();
191 final ModifyTransactionRequest successorReq = successor.commitRequest(req.isCoordinated());
192 successor.sendRequest(successorReq, callback);
193 } else if (request instanceof AbortLocalTransactionRequest) {
194 LOG.debug("Forwarding abort {} to successor {}", request, successor);
196 } else if (request instanceof TransactionPurgeRequest) {
197 LOG.debug("Forwarding purge {} to successor {}", request, successor);
198 successor.enqueuePurge(callback);
199 } else if (request instanceof ModifyTransactionRequest) {
200 successor.handleForwardedRequest(request, callback);
202 throw unhandledRequest(request);
207 void forwardToLocal(final LocalProxyTransaction successor, final TransactionRequest<?> request,
208 final Consumer<Response<?, ?>> callback) {
209 if (request instanceof AbortLocalTransactionRequest) {
210 successor.sendAbort(request, callback);
211 } else if (request instanceof TransactionPurgeRequest) {
212 successor.enqueuePurge(callback);
214 throw unhandledRequest(request);
217 LOG.debug("Forwarded request {} to successor {}", request, successor);
220 void sendAbort(final TransactionRequest<?> request, final Consumer<Response<?, ?>> callback) {
221 sendRequest(request, callback);
224 void enqueueAbort(final TransactionRequest<?> request, final Consumer<Response<?, ?>> callback,
225 final long enqueuedTicks) {
226 enqueueRequest(request, callback, enqueuedTicks);