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 javax.annotation.Nonnull;
  13 import javax.annotation.Nullable;
  14 import org.opendaylight.controller.cluster.access.concepts.TransactionIdentifier;
  15 import org.opendaylight.controller.cluster.datastore.utils.ActorContext;
  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.DataTree;
  24 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeModification;
  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 DataTree dataTree;
  36     private final ActorContext actorContext;
  37
  38     LocalTransactionFactoryImpl(final ActorContext actorContext, final ActorSelection leader, final DataTree dataTree) {
  39         this.leader = Preconditions.checkNotNull(leader);
  40         this.dataTree = Preconditions.checkNotNull(dataTree);
  41         this.actorContext = actorContext;
  42     }
  43
  44     DataTree getDataTree() {
  45         return dataTree;
  46     }
  47
  48     @Override
  49     public DOMStoreReadTransaction newReadOnlyTransaction(TransactionIdentifier identifier) {
  50         return SnapshotBackedTransactions.newReadTransaction(identifier, false, dataTree.takeSnapshot());
  51     }
  52
  53     @Override
  54     public DOMStoreReadWriteTransaction newReadWriteTransaction(TransactionIdentifier identifier) {
  55         return SnapshotBackedTransactions.newReadWriteTransaction(identifier, false, dataTree.takeSnapshot(), this);
  56     }
  57
  58     @Override
  59     public DOMStoreWriteTransaction newWriteOnlyTransaction(TransactionIdentifier identifier) {
  60         return SnapshotBackedTransactions.newWriteTransaction(identifier, false, dataTree.takeSnapshot(), this);
  61     }
  62
  63     @Override
  64     protected void transactionAborted(final SnapshotBackedWriteTransaction<TransactionIdentifier> tx) {
  65         // No-op
  66     }
  67
  68     @Override
  69     protected DOMStoreThreePhaseCommitCohort transactionReady(
  70             final SnapshotBackedWriteTransaction<TransactionIdentifier> tx,
  71             final DataTreeModification tree,
  72             final Exception readyError) {
  73         return new LocalThreePhaseCommitCohort(actorContext, leader, tx, tree, readyError);
  74     }
  75
  76     @SuppressWarnings({"unchecked", "checkstyle:IllegalCatch"})
  77     @Override
  78     public LocalThreePhaseCommitCohort onTransactionReady(@Nonnull DOMStoreWriteTransaction tx,
  79             @Nullable Exception operationError) {
  80         Preconditions.checkArgument(tx instanceof SnapshotBackedWriteTransaction);
  81         if (operationError != null) {
  82             return new LocalThreePhaseCommitCohort(actorContext, leader,
  83                     (SnapshotBackedWriteTransaction<TransactionIdentifier>)tx, operationError);
  84         }
  85
  86         return (LocalThreePhaseCommitCohort) tx.ready();
  87     }
  88 }