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