Ensure that modifications are tracked by ShardTransaction
[controller.git] / opendaylight / md-sal / sal-distributed-datastore / src / main / java / org / opendaylight / controller / cluster / datastore / ShardTransaction.java
1 /*
2  * Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
3  *
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
7  */
8
9 package org.opendaylight.controller.cluster.datastore;
10
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;
41
42 import java.util.concurrent.ExecutionException;
43
44 /**
45  * The ShardTransaction Actor represents a remote transaction
46  *<p>
47  * The ShardTransaction Actor delegates all actions to DOMDataReadWriteTransaction
48  *</p>
49  *<p>
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.
54  *</p>
55  *<p>
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}
64  * </p>
65  */
66 public class ShardTransaction extends UntypedActor {
67
68   private final DOMStoreReadWriteTransaction transaction;
69
70   private final MutableCompositeModification modification = new MutableCompositeModification();
71
72   private final LoggingAdapter log = Logging.getLogger(getContext().system(), this);
73
74   public ShardTransaction(DOMStoreReadWriteTransaction transaction) {
75     this.transaction = transaction;
76   }
77
78
79   public static Props props(final DOMStoreReadWriteTransaction transaction){
80     return Props.create(new Creator<ShardTransaction>(){
81
82       @Override
83       public ShardTransaction create() throws Exception {
84         return new ShardTransaction(transaction);
85       }
86     });
87   }
88
89   @Override
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());
106     }
107   }
108
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);
114
115     future.addListener(new Runnable() {
116       @Override
117       public void run() {
118         try {
119           Optional<NormalizedNode<?, ?>> optional = future.get();
120           if(optional.isPresent()){
121             sender.tell(new ReadDataReply(optional.get()), self);
122           } else {
123             //TODO : Need to decide what to do here
124           }
125         } catch (InterruptedException | ExecutionException e) {
126           log.error(e, "An exception happened when reading data from path : " + path.toString());
127         }
128
129       }
130     }, getContext().dispatcher());
131   }
132
133
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());
138   }
139
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());
144   }
145
146   private void deleteData(DeleteData message){
147     modification.addModification(new DeleteModification(message.getPath()));
148     transaction.delete(message.getPath());
149     getSender().tell(new DeleteDataReply(), getSelf());
150   }
151
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());
156
157   }
158
159   private void closeTransaction(CloseTransaction message){
160     transaction.close();
161     getSender().tell(new CloseTransactionReply(), getSelf());
162   }
163
164
165   // These classes are in here for test purposes only
166
167   static class GetCompositedModification {
168
169   }
170
171   static class GetCompositeModificationReply {
172     private final CompositeModification modification;
173
174
175     GetCompositeModificationReply(CompositeModification modification) {
176       this.modification = modification;
177     }
178
179
180     public CompositeModification getModification() {
181       return modification;
182     }
183   }
184 }