2 * Copyright (c) 2015 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 akka.actor.ActorSelection;
11 import akka.dispatch.Futures;
12 import akka.dispatch.OnComplete;
13 import com.google.common.base.Preconditions;
14 import com.google.common.util.concurrent.ListenableFuture;
15 import org.opendaylight.controller.cluster.datastore.identifiers.TransactionIdentifier;
16 import org.opendaylight.controller.cluster.datastore.messages.CommitTransactionReply;
17 import org.opendaylight.controller.cluster.datastore.messages.ReadyLocalTransaction;
18 import org.opendaylight.controller.cluster.datastore.utils.ActorContext;
19 import org.opendaylight.controller.sal.core.spi.data.DOMStoreThreePhaseCommitCohort;
20 import org.opendaylight.controller.sal.core.spi.data.SnapshotBackedWriteTransaction;
21 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeModification;
22 import org.slf4j.Logger;
23 import org.slf4j.LoggerFactory;
24 import scala.concurrent.Future;
27 * Fake {@link DOMStoreThreePhaseCommitCohort} instantiated for local transactions to conform with the DOM
28 * transaction APIs. It is only used to hold the data from a local DOM transaction ready operation and to
29 * initiate direct or coordinated commits from the front-end by sending the ReadyLocalTransaction message.
30 * It is not actually called by the front-end to perform 3PC thus the canCommit/preCommit/commit methods
33 class LocalThreePhaseCommitCohort implements DOMStoreThreePhaseCommitCohort {
34 private static final Logger LOG = LoggerFactory.getLogger(LocalThreePhaseCommitCohort.class);
36 private final SnapshotBackedWriteTransaction<TransactionIdentifier> transaction;
37 private final DataTreeModification modification;
38 private final ActorContext actorContext;
39 private final ActorSelection leader;
40 private final Exception operationError;
42 protected LocalThreePhaseCommitCohort(final ActorContext actorContext, final ActorSelection leader,
43 final SnapshotBackedWriteTransaction<TransactionIdentifier> transaction, final DataTreeModification modification) {
44 this.actorContext = Preconditions.checkNotNull(actorContext);
45 this.leader = Preconditions.checkNotNull(leader);
46 this.transaction = Preconditions.checkNotNull(transaction);
47 this.modification = Preconditions.checkNotNull(modification);
48 this.operationError = null;
51 protected LocalThreePhaseCommitCohort(final ActorContext actorContext, final ActorSelection leader,
52 final SnapshotBackedWriteTransaction<TransactionIdentifier> transaction, final Exception operationError) {
53 this.actorContext = Preconditions.checkNotNull(actorContext);
54 this.leader = Preconditions.checkNotNull(leader);
55 this.transaction = Preconditions.checkNotNull(transaction);
56 this.operationError = Preconditions.checkNotNull(operationError);
57 this.modification = null;
60 private Future<Object> initiateCommit(final boolean immediate) {
61 if(operationError != null) {
62 return Futures.failed(operationError);
65 final ReadyLocalTransaction message = new ReadyLocalTransaction(transaction.getIdentifier().toString(),
66 modification, immediate);
67 return actorContext.executeOperationAsync(leader, message, actorContext.getTransactionCommitOperationTimeout());
70 Future<ActorSelection> initiateCoordinatedCommit() {
71 final Future<Object> messageFuture = initiateCommit(false);
72 final Future<ActorSelection> ret = TransactionReadyReplyMapper.transform(messageFuture, actorContext,
73 transaction.getIdentifier());
74 ret.onComplete(new OnComplete<ActorSelection>() {
76 public void onComplete(final Throwable failure, final ActorSelection success) throws Throwable {
77 if (failure != null) {
78 LOG.info("Failed to prepare transaction {} on backend", transaction.getIdentifier(), failure);
79 transactionAborted(transaction);
83 LOG.debug("Transaction {} resolved to actor {}", transaction.getIdentifier(), success);
85 }, actorContext.getClientDispatcher());
90 Future<Object> initiateDirectCommit() {
91 final Future<Object> messageFuture = initiateCommit(true);
92 messageFuture.onComplete(new OnComplete<Object>() {
94 public void onComplete(final Throwable failure, final Object message) throws Throwable {
95 if (failure != null) {
96 LOG.error("Failed to prepare transaction {} on backend", transaction.getIdentifier(), failure);
97 transactionAborted(transaction);
98 } else if (CommitTransactionReply.isSerializedType(message)) {
99 LOG.debug("Transaction {} committed successfully", transaction.getIdentifier());
100 transactionCommitted(transaction);
102 LOG.error("Transaction {} resulted in unhandled message type {}, aborting", message.getClass());
103 transactionAborted(transaction);
106 }, actorContext.getClientDispatcher());
108 return messageFuture;
112 public final ListenableFuture<Boolean> canCommit() {
114 throw new UnsupportedOperationException();
118 public final ListenableFuture<Void> preCommit() {
120 throw new UnsupportedOperationException();
124 public final ListenableFuture<Void> abort() {
126 throw new UnsupportedOperationException();
130 public final ListenableFuture<Void> commit() {
132 throw new UnsupportedOperationException();
135 protected void transactionAborted(SnapshotBackedWriteTransaction<TransactionIdentifier> transaction) {
138 protected void transactionCommitted(SnapshotBackedWriteTransaction<TransactionIdentifier> transaction) {