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 com.google.common.util.concurrent.FutureCallback;
  17 import com.google.common.util.concurrent.Futures;
  18 import com.google.common.util.concurrent.ListenableFuture;
  19 import org.opendaylight.controller.cluster.datastore.jmx.mbeans.shard.ShardStats;
  20 import org.opendaylight.controller.cluster.datastore.messages.CreateSnapshot;
  21 import org.opendaylight.controller.cluster.datastore.messages.DataExists;
  22 import org.opendaylight.controller.cluster.datastore.messages.ReadData;
  23 import org.opendaylight.controller.cluster.datastore.utils.SerializationUtils;
  24 import org.opendaylight.controller.cluster.raft.base.messages.CaptureSnapshotReply;
  25 import org.opendaylight.controller.sal.core.spi.data.DOMStoreReadTransaction;
  26 import org.opendaylight.controller.sal.core.spi.data.DOMStoreTransaction;
  27 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  28 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  29 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  30
  31 /**
  32  * @author: syedbahm
  33  * Date: 8/6/14
  34  */
  35 public class ShardReadTransaction extends ShardTransaction {
  36     private static final YangInstanceIdentifier DATASTORE_ROOT = YangInstanceIdentifier.builder().build();
  37
  38     private final DOMStoreReadTransaction transaction;
  39
  40     public ShardReadTransaction(DOMStoreReadTransaction transaction, ActorRef shardActor,
  41             SchemaContext schemaContext, ShardStats shardStats, String transactionID,
  42             short clientTxVersion) {
  43         super(shardActor, schemaContext, shardStats, transactionID, clientTxVersion);
  44         this.transaction = transaction;
  45     }
  46
  47     @Override
  48     public void handleReceive(Object message) throws Exception {
  49         if(message instanceof ReadData) {
  50             readData(transaction, (ReadData) message, !SERIALIZED_REPLY);
  51
  52         } else if (message instanceof DataExists) {
  53             dataExists(transaction, (DataExists) message, !SERIALIZED_REPLY);
  54         } else if (message instanceof CreateSnapshot) {
  55             createSnapshot();
  56         } else if(ReadData.SERIALIZABLE_CLASS.equals(message.getClass())) {
  57             readData(transaction, ReadData.fromSerializable(message), SERIALIZED_REPLY);
  58
  59         } else if(DataExists.SERIALIZABLE_CLASS.equals(message.getClass())) {
  60             dataExists(transaction, DataExists.fromSerializable(message), SERIALIZED_REPLY);
  61
  62         } else {
  63             super.handleReceive(message);
  64         }
  65     }
  66
  67     private void createSnapshot() {
  68
  69         // This is a special message sent by the shard to send back a serialized snapshot of the whole
  70         // data store tree. This transaction was created for that purpose only so we can
  71         // self-destruct after sending the reply.
  72
  73         final ActorRef sender = getSender();
  74         final ActorRef self = getSelf();
  75         final ListenableFuture<Optional<NormalizedNode<?, ?>>> future = transaction.read(DATASTORE_ROOT);
  76
  77         Futures.addCallback(future, new FutureCallback<Optional<NormalizedNode<?, ?>>>() {
  78             @Override
  79             public void onSuccess(Optional<NormalizedNode<?, ?>> result) {
  80                 byte[] serialized = SerializationUtils.serializeNormalizedNode(result.get());
  81                 sender.tell(new CaptureSnapshotReply(serialized), self);
  82
  83                 self.tell(PoisonPill.getInstance(), self);
  84             }
  85
  86             @Override
  87             public void onFailure(Throwable t) {
  88                 sender.tell(new akka.actor.Status.Failure(t), self);
  89
  90                 self.tell(PoisonPill.getInstance(), self);
  91             }
  92         });
  93     }
  94
  95     @Override
  96     protected DOMStoreTransaction getDOMStoreTransaction() {
  97         return transaction;
  98     }
  99
 100     @Override
 101     protected boolean returnCloseTransactionReply() {
 102         return false;
 103     }
 104 }