Use YangInstanceIdentifier.EMPTY
[controller.git] / opendaylight / md-sal / sal-distributed-datastore / src / main / java / org / opendaylight / controller / cluster / datastore / ShardReadTransaction.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.PoisonPill;
13 import com.google.common.base.Optional;
14 import org.opendaylight.controller.cluster.datastore.jmx.mbeans.shard.ShardStats;
15 import org.opendaylight.controller.cluster.datastore.messages.CreateSnapshot;
16 import org.opendaylight.controller.cluster.datastore.messages.DataExists;
17 import org.opendaylight.controller.cluster.datastore.messages.ReadData;
18 import org.opendaylight.controller.cluster.datastore.utils.SerializationUtils;
19 import org.opendaylight.controller.cluster.raft.base.messages.CaptureSnapshotReply;
20 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
21 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
22
23 /**
24  * @author: syedbahm
25  * Date: 8/6/14
26  */
27 public class ShardReadTransaction extends ShardTransaction {
28     private final AbstractShardDataTreeTransaction<?> transaction;
29
30     public ShardReadTransaction(AbstractShardDataTreeTransaction<?> transaction, ActorRef shardActor,
31             ShardStats shardStats, String transactionID) {
32         super(shardActor, shardStats, transactionID);
33         this.transaction = transaction;
34     }
35
36     @Override
37     public void handleReceive(Object message) throws Exception {
38         if (message instanceof CreateSnapshot) {
39             createSnapshot();
40         } else if(ReadData.isSerializedType(message)) {
41             readData(transaction, ReadData.fromSerializable(message));
42         } else if(DataExists.isSerializedType(message)) {
43             dataExists(transaction, DataExists.fromSerializable(message));
44
45         } else {
46             super.handleReceive(message);
47         }
48     }
49
50     private void createSnapshot() {
51
52         // This is a special message sent by the shard to send back a serialized snapshot of the whole
53         // data store tree. This transaction was created for that purpose only so we can
54         // self-destruct after sending the reply.
55
56         final ActorRef sender = getSender();
57         final ActorRef self = getSelf();
58         final Optional<NormalizedNode<?, ?>> result = transaction.getSnapshot().readNode(YangInstanceIdentifier.EMPTY);
59
60         byte[] serialized = SerializationUtils.serializeNormalizedNode(result.get());
61         sender.tell(new CaptureSnapshotReply(serialized), self);
62
63         self.tell(PoisonPill.getInstance(), self);
64     }
65
66     @Override
67     protected AbstractShardDataTreeTransaction<?> getDOMStoreTransaction() {
68         return transaction;
69     }
70
71     @Override
72     protected boolean returnCloseTransactionReply() {
73         return false;
74     }
75 }

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