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

   1 /*
   2  * Copyright (c) 2015 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 package org.opendaylight.controller.cluster.datastore;
   9
  10 import akka.actor.ActorSelection;
  11 import com.google.common.base.Preconditions;
  12 import org.opendaylight.controller.cluster.datastore.identifiers.TransactionIdentifier;
  13 import org.opendaylight.controller.cluster.datastore.utils.ActorContext;
  14 import org.opendaylight.controller.sal.core.spi.data.DOMStoreReadTransaction;
  15 import org.opendaylight.controller.sal.core.spi.data.DOMStoreReadWriteTransaction;
  16 import org.opendaylight.controller.sal.core.spi.data.DOMStoreThreePhaseCommitCohort;
  17 import org.opendaylight.controller.sal.core.spi.data.DOMStoreWriteTransaction;
  18 import org.opendaylight.controller.sal.core.spi.data.SnapshotBackedTransactions;
  19 import org.opendaylight.controller.sal.core.spi.data.SnapshotBackedWriteTransaction;
  20 import org.opendaylight.controller.sal.core.spi.data.SnapshotBackedWriteTransaction.TransactionReadyPrototype;
  21 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTree;
  22 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeModification;
  23
  24 /**
  25  * {@link LocalTransactionFactory} for instantiating backing transactions which are
  26  * disconnected from each other, ie not chained. These are used by {@link AbstractTransactionContextFactory}
  27  * to instantiate transactions on shards which are co-located with the shard leader.
  28  */
  29 final class LocalTransactionFactoryImpl extends TransactionReadyPrototype<TransactionIdentifier>
  30         implements LocalTransactionFactory {
  31
  32     private final ActorSelection leader;
  33     private final DataTree dataTree;
  34     private final ActorContext actorContext;
  35
  36     LocalTransactionFactoryImpl(final ActorContext actorContext, final ActorSelection leader, final DataTree dataTree) {
  37         this.leader = Preconditions.checkNotNull(leader);
  38         this.dataTree = Preconditions.checkNotNull(dataTree);
  39         this.actorContext = actorContext;
  40     }
  41
  42     DataTree getDataTree() {
  43         return dataTree;
  44     }
  45
  46     @Override
  47     public DOMStoreReadTransaction newReadOnlyTransaction(TransactionIdentifier identifier) {
  48         return SnapshotBackedTransactions.newReadTransaction(identifier, false, dataTree.takeSnapshot());
  49     }
  50
  51     @Override
  52     public DOMStoreReadWriteTransaction newReadWriteTransaction(TransactionIdentifier identifier) {
  53         return SnapshotBackedTransactions.newReadWriteTransaction(identifier, false, dataTree.takeSnapshot(), this);
  54     }
  55
  56     @Override
  57     public DOMStoreWriteTransaction newWriteOnlyTransaction(TransactionIdentifier identifier) {
  58         return SnapshotBackedTransactions.newWriteTransaction(identifier, false, dataTree.takeSnapshot(), this);
  59     }
  60
  61     @Override
  62     protected void transactionAborted(final SnapshotBackedWriteTransaction<TransactionIdentifier> tx) {
  63         // No-op
  64     }
  65
  66     @Override
  67     protected DOMStoreThreePhaseCommitCohort transactionReady(final SnapshotBackedWriteTransaction<TransactionIdentifier> tx,
  68             final DataTreeModification tree) {
  69         return new LocalThreePhaseCommitCohort(actorContext, leader, tx, tree);
  70     }
  71
  72     @SuppressWarnings("unchecked")
  73     @Override
  74     public LocalThreePhaseCommitCohort onTransactionReady(DOMStoreWriteTransaction tx) {
  75         try {
  76             return (LocalThreePhaseCommitCohort) tx.ready();
  77         } catch (Exception e) {
  78             // Unfortunately we need to cast to SnapshotBackedWriteTransaction here as it's required by
  79             // LocalThreePhaseCommitCohort.
  80             return new LocalThreePhaseCommitCohort(actorContext, leader,
  81                     (SnapshotBackedWriteTransaction<TransactionIdentifier>)tx, e);
  82         }
  83     }
  84 }