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 static final YangInstanceIdentifier DATASTORE_ROOT = YangInstanceIdentifier.builder().build();
  29
  30     private final AbstractShardDataTreeTransaction<?> transaction;
  31
  32     public ShardReadTransaction(AbstractShardDataTreeTransaction<?> transaction, ActorRef shardActor,
  33             ShardStats shardStats, String transactionID, short clientTxVersion) {
  34         super(shardActor, shardStats, transactionID, clientTxVersion);
  35         this.transaction = transaction;
  36     }
  37
  38     @Override
  39     public void handleReceive(Object message) throws Exception {
  40         if (message instanceof CreateSnapshot) {
  41             createSnapshot();
  42         } else if(ReadData.isSerializedType(message)) {
  43             readData(transaction, ReadData.fromSerializable(message));
  44         } else if(DataExists.isSerializedType(message)) {
  45             dataExists(transaction, DataExists.fromSerializable(message));
  46
  47         } else {
  48             super.handleReceive(message);
  49         }
  50     }
  51
  52     private void createSnapshot() {
  53
  54         // This is a special message sent by the shard to send back a serialized snapshot of the whole
  55         // data store tree. This transaction was created for that purpose only so we can
  56         // self-destruct after sending the reply.
  57
  58         final ActorRef sender = getSender();
  59         final ActorRef self = getSelf();
  60         final Optional<NormalizedNode<?, ?>> result = transaction.getSnapshot().readNode(DATASTORE_ROOT);
  61
  62         byte[] serialized = SerializationUtils.serializeNormalizedNode(result.get());
  63         sender.tell(new CaptureSnapshotReply(serialized), self);
  64
  65         self.tell(PoisonPill.getInstance(), self);
  66     }
  67
  68     @Override
  69     protected AbstractShardDataTreeTransaction<?> getDOMStoreTransaction() {
  70         return transaction;
  71     }
  72
  73     @Override
  74     protected boolean returnCloseTransactionReply() {
  75         return false;
  76     }
  77 }