opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ShardReadTransaction.java

   1 /*
   2  *
   3  *  Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
   4  *
   5  *  This program and the accompanying materials are made available under the
   6  *  terms of the Eclipse Public License v1.0 which accompanies this distribution,
   7  *  and is available at http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  */
  10
  11 package org.opendaylight.controller.cluster.datastore;
  12
  13 import akka.actor.ActorRef;
  14 import akka.actor.PoisonPill;
  15 import com.google.common.base.Optional;
  16 import org.opendaylight.controller.cluster.datastore.jmx.mbeans.shard.ShardStats;
  17 import org.opendaylight.controller.cluster.datastore.messages.CreateSnapshot;
  18 import org.opendaylight.controller.cluster.datastore.messages.DataExists;
  19 import org.opendaylight.controller.cluster.datastore.messages.ReadData;
  20 import org.opendaylight.controller.cluster.datastore.utils.SerializationUtils;
  21 import org.opendaylight.controller.cluster.raft.base.messages.CaptureSnapshotReply;
  22 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  23 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  24
  25 /**
  26  * @author: syedbahm
  27  * Date: 8/6/14
  28  */
  29 public class ShardReadTransaction extends ShardTransaction {
  30     private static final YangInstanceIdentifier DATASTORE_ROOT = YangInstanceIdentifier.builder().build();
  31
  32     private final AbstractShardDataTreeTransaction<?> transaction;
  33
  34     public ShardReadTransaction(AbstractShardDataTreeTransaction<?> transaction, ActorRef shardActor,
  35             ShardStats shardStats, String transactionID, short clientTxVersion) {
  36         super(shardActor, shardStats, transactionID, clientTxVersion);
  37         this.transaction = transaction;
  38     }
  39
  40     @Override
  41     public void handleReceive(Object message) throws Exception {
  42         if(message instanceof ReadData) {
  43             readData(transaction, (ReadData) message, !SERIALIZED_REPLY);
  44
  45         } else if (message instanceof DataExists) {
  46             dataExists(transaction, (DataExists) message, !SERIALIZED_REPLY);
  47         } else if (message instanceof CreateSnapshot) {
  48             createSnapshot();
  49         } else if(ReadData.SERIALIZABLE_CLASS.equals(message.getClass())) {
  50             readData(transaction, ReadData.fromSerializable(message), SERIALIZED_REPLY);
  51
  52         } else if(DataExists.SERIALIZABLE_CLASS.equals(message.getClass())) {
  53             dataExists(transaction, DataExists.fromSerializable(message), SERIALIZED_REPLY);
  54
  55         } else {
  56             super.handleReceive(message);
  57         }
  58     }
  59
  60     private void createSnapshot() {
  61
  62         // This is a special message sent by the shard to send back a serialized snapshot of the whole
  63         // data store tree. This transaction was created for that purpose only so we can
  64         // self-destruct after sending the reply.
  65
  66         final ActorRef sender = getSender();
  67         final ActorRef self = getSelf();
  68         final Optional<NormalizedNode<?, ?>> result = transaction.getSnapshot().readNode(DATASTORE_ROOT);
  69
  70         byte[] serialized = SerializationUtils.serializeNormalizedNode(result.get());
  71         sender.tell(new CaptureSnapshotReply(serialized), self);
  72
  73         self.tell(PoisonPill.getInstance(), self);
  74     }
  75
  76     @Override
  77     protected AbstractShardDataTreeTransaction<?> getDOMStoreTransaction() {
  78         return transaction;
  79     }
  80
  81     @Override
  82     protected boolean returnCloseTransactionReply() {
  83         return false;
  84     }
  85 }