2 * Copyright (c) 2014 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
9 package org.opendaylight.controller.cluster.datastore;
11 import akka.actor.ActorRef;
12 import akka.actor.Props;
13 import akka.actor.UntypedActor;
14 import akka.event.Logging;
15 import akka.event.LoggingAdapter;
16 import akka.japi.Creator;
17 import com.google.common.base.Optional;
18 import com.google.common.util.concurrent.ListenableFuture;
19 import org.opendaylight.controller.cluster.datastore.messages.CloseTransaction;
20 import org.opendaylight.controller.cluster.datastore.messages.CloseTransactionReply;
21 import org.opendaylight.controller.cluster.datastore.messages.DeleteData;
22 import org.opendaylight.controller.cluster.datastore.messages.DeleteDataReply;
23 import org.opendaylight.controller.cluster.datastore.messages.MergeData;
24 import org.opendaylight.controller.cluster.datastore.messages.MergeDataReply;
25 import org.opendaylight.controller.cluster.datastore.messages.ReadData;
26 import org.opendaylight.controller.cluster.datastore.messages.ReadDataReply;
27 import org.opendaylight.controller.cluster.datastore.messages.ReadyTransaction;
28 import org.opendaylight.controller.cluster.datastore.messages.ReadyTransactionReply;
29 import org.opendaylight.controller.cluster.datastore.messages.WriteData;
30 import org.opendaylight.controller.cluster.datastore.messages.WriteDataReply;
31 import org.opendaylight.controller.cluster.datastore.modification.CompositeModification;
32 import org.opendaylight.controller.cluster.datastore.modification.DeleteModification;
33 import org.opendaylight.controller.cluster.datastore.modification.ImmutableCompositeModification;
34 import org.opendaylight.controller.cluster.datastore.modification.MergeModification;
35 import org.opendaylight.controller.cluster.datastore.modification.MutableCompositeModification;
36 import org.opendaylight.controller.cluster.datastore.modification.WriteModification;
37 import org.opendaylight.controller.sal.core.spi.data.DOMStoreReadWriteTransaction;
38 import org.opendaylight.controller.sal.core.spi.data.DOMStoreThreePhaseCommitCohort;
39 import org.opendaylight.yangtools.yang.data.api.InstanceIdentifier;
40 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
42 import java.util.concurrent.ExecutionException;
45 * The ShardTransaction Actor represents a remote transaction
47 * The ShardTransaction Actor delegates all actions to DOMDataReadWriteTransaction
50 * Even though the DOMStore and the DOMStoreTransactionChain implement multiple types of transactions
51 * the ShardTransaction Actor only works with read-write transactions. This is just to keep the logic simple. At this
52 * time there are no known advantages for creating a read-only or write-only transaction which may change over time
53 * at which point we can optimize things in the distributed store as well.
56 * Handles Messages <br/>
57 * ---------------- <br/>
58 * <li> {@link org.opendaylight.controller.cluster.datastore.messages.ReadData}
59 * <li> {@link org.opendaylight.controller.cluster.datastore.messages.WriteData}
60 * <li> {@link org.opendaylight.controller.cluster.datastore.messages.MergeData}
61 * <li> {@link org.opendaylight.controller.cluster.datastore.messages.DeleteData}
62 * <li> {@link org.opendaylight.controller.cluster.datastore.messages.ReadyTransaction}
63 * <li> {@link org.opendaylight.controller.cluster.datastore.messages.CloseTransaction}
66 public class ShardTransaction extends UntypedActor {
68 private final DOMStoreReadWriteTransaction transaction;
70 private final MutableCompositeModification modification = new MutableCompositeModification();
72 private final LoggingAdapter log = Logging.getLogger(getContext().system(), this);
74 public ShardTransaction(DOMStoreReadWriteTransaction transaction) {
75 this.transaction = transaction;
79 public static Props props(final DOMStoreReadWriteTransaction transaction){
80 return Props.create(new Creator<ShardTransaction>(){
83 public ShardTransaction create() throws Exception {
84 return new ShardTransaction(transaction);
90 public void onReceive(Object message) throws Exception {
91 if(message instanceof ReadData){
92 readData((ReadData) message);
93 } else if(message instanceof WriteData){
94 writeData((WriteData) message);
95 } else if(message instanceof MergeData){
96 mergeData((MergeData) message);
97 } else if(message instanceof DeleteData){
98 deleteData((DeleteData) message);
99 } else if(message instanceof ReadyTransaction){
100 readyTransaction((ReadyTransaction) message);
101 } else if(message instanceof CloseTransaction){
102 closeTransaction((CloseTransaction) message);
103 } else if(message instanceof GetCompositedModification){
104 // This is here for testing only
105 getSender().tell(new GetCompositeModificationReply(new ImmutableCompositeModification(modification)), getSelf());
109 private void readData(ReadData message) {
110 final ActorRef sender = getSender();
111 final ActorRef self = getSelf();
112 final InstanceIdentifier path = message.getPath();
113 final ListenableFuture<Optional<NormalizedNode<?, ?>>> future = transaction.read(path);
115 future.addListener(new Runnable() {
119 Optional<NormalizedNode<?, ?>> optional = future.get();
120 if(optional.isPresent()){
121 sender.tell(new ReadDataReply(optional.get()), self);
123 //TODO : Need to decide what to do here
125 } catch (InterruptedException | ExecutionException e) {
126 log.error(e, "An exception happened when reading data from path : " + path.toString());
130 }, getContext().dispatcher());
134 private void writeData(WriteData message){
135 modification.addModification(new WriteModification(message.getPath(), message.getData()));
136 transaction.write(message.getPath(), message.getData());
137 getSender().tell(new WriteDataReply(), getSelf());
140 private void mergeData(MergeData message){
141 modification.addModification(new MergeModification(message.getPath(), message.getData()));
142 transaction.merge(message.getPath(), message.getData());
143 getSender().tell(new MergeDataReply(), getSelf());
146 private void deleteData(DeleteData message){
147 modification.addModification(new DeleteModification(message.getPath()));
148 transaction.delete(message.getPath());
149 getSender().tell(new DeleteDataReply(), getSelf());
152 private void readyTransaction(ReadyTransaction message){
153 DOMStoreThreePhaseCommitCohort cohort = transaction.ready();
154 ActorRef cohortActor = getContext().actorOf(ThreePhaseCommitCohort.props(cohort));
155 getSender().tell(new ReadyTransactionReply(cohortActor.path()), getSelf());
159 private void closeTransaction(CloseTransaction message){
161 getSender().tell(new CloseTransactionReply(), getSelf());
165 // These classes are in here for test purposes only
167 static class GetCompositedModification {
171 static class GetCompositeModificationReply {
172 private final CompositeModification modification;
175 GetCompositeModificationReply(CompositeModification modification) {
176 this.modification = modification;
180 public CompositeModification getModification() {