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 static com.google.common.base.Preconditions.checkArgument;
  11 import static java.util.Objects.requireNonNull;
  12
  13 import akka.actor.ActorSelection;
  14 import javax.annotation.Nonnull;
  15 import javax.annotation.Nullable;
  16 import org.opendaylight.controller.cluster.access.concepts.TransactionIdentifier;
  17 import org.opendaylight.controller.cluster.datastore.utils.ActorUtils;
  18 import org.opendaylight.mdsal.dom.spi.store.DOMStoreReadTransaction;
  19 import org.opendaylight.mdsal.dom.spi.store.DOMStoreReadWriteTransaction;
  20 import org.opendaylight.mdsal.dom.spi.store.DOMStoreThreePhaseCommitCohort;
  21 import org.opendaylight.mdsal.dom.spi.store.DOMStoreWriteTransaction;
  22 import org.opendaylight.mdsal.dom.spi.store.SnapshotBackedTransactions;
  23 import org.opendaylight.mdsal.dom.spi.store.SnapshotBackedWriteTransaction;
  24 import org.opendaylight.mdsal.dom.spi.store.SnapshotBackedWriteTransaction.TransactionReadyPrototype;
  25 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTree;
  26 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeModification;
  27
  28 /**
  29  * {@link LocalTransactionFactory} for instantiating backing transactions which are
  30  * disconnected from each other, ie not chained. These are used by {@link AbstractTransactionContextFactory}
  31  * to instantiate transactions on shards which are co-located with the shard leader.
  32  */
  33 final class LocalTransactionFactoryImpl extends TransactionReadyPrototype<TransactionIdentifier>
  34         implements LocalTransactionFactory {
  35
  36     private final ActorSelection leader;
  37     private final DataTree dataTree;
  38     private final ActorUtils actorUtils;
  39
  40     LocalTransactionFactoryImpl(final ActorUtils actorUtils, final ActorSelection leader, final DataTree dataTree) {
  41         this.leader = requireNonNull(leader);
  42         this.dataTree = requireNonNull(dataTree);
  43         this.actorUtils = actorUtils;
  44     }
  45
  46     DataTree getDataTree() {
  47         return dataTree;
  48     }
  49
  50     @Override
  51     public DOMStoreReadTransaction newReadOnlyTransaction(TransactionIdentifier identifier) {
  52         return SnapshotBackedTransactions.newReadTransaction(identifier, false, dataTree.takeSnapshot());
  53     }
  54
  55     @Override
  56     public DOMStoreReadWriteTransaction newReadWriteTransaction(TransactionIdentifier identifier) {
  57         return SnapshotBackedTransactions.newReadWriteTransaction(identifier, false, dataTree.takeSnapshot(), this);
  58     }
  59
  60     @Override
  61     public DOMStoreWriteTransaction newWriteOnlyTransaction(TransactionIdentifier identifier) {
  62         return SnapshotBackedTransactions.newWriteTransaction(identifier, false, dataTree.takeSnapshot(), this);
  63     }
  64
  65     @Override
  66     protected void transactionAborted(final SnapshotBackedWriteTransaction<TransactionIdentifier> tx) {
  67         // No-op
  68     }
  69
  70     @Override
  71     protected DOMStoreThreePhaseCommitCohort transactionReady(
  72             final SnapshotBackedWriteTransaction<TransactionIdentifier> tx,
  73             final DataTreeModification tree,
  74             final Exception readyError) {
  75         return new LocalThreePhaseCommitCohort(actorUtils, leader, tx, tree, readyError);
  76     }
  77
  78     @SuppressWarnings({"unchecked", "checkstyle:IllegalCatch"})
  79     @Override
  80     public LocalThreePhaseCommitCohort onTransactionReady(@Nonnull DOMStoreWriteTransaction tx,
  81             @Nullable Exception operationError) {
  82         checkArgument(tx instanceof SnapshotBackedWriteTransaction);
  83         if (operationError != null) {
  84             return new LocalThreePhaseCommitCohort(actorUtils, leader,
  85                     (SnapshotBackedWriteTransaction<TransactionIdentifier>)tx, operationError);
  86         }
  87
  88         return (LocalThreePhaseCommitCohort) tx.ready();
  89     }
  90 }