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.datastore.identifiers.TransactionIdentifier;
  15 import org.opendaylight.controller.cluster.datastore.utils.ActorContext;
  16 import org.opendaylight.controller.sal.core.spi.data.DOMStoreReadTransaction;
  17 import org.opendaylight.controller.sal.core.spi.data.DOMStoreReadWriteTransaction;
  18 import org.opendaylight.controller.sal.core.spi.data.DOMStoreThreePhaseCommitCohort;
  19 import org.opendaylight.controller.sal.core.spi.data.DOMStoreWriteTransaction;
  20 import org.opendaylight.controller.sal.core.spi.data.SnapshotBackedTransactions;
  21 import org.opendaylight.controller.sal.core.spi.data.SnapshotBackedWriteTransaction;
  22 import org.opendaylight.controller.sal.core.spi.data.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(final SnapshotBackedWriteTransaction<TransactionIdentifier> tx,
  70             final DataTreeModification tree) {
  71         return new LocalThreePhaseCommitCohort(actorContext, leader, tx, tree);
  72     }
  73
  74     @SuppressWarnings("unchecked")
  75     @Override
  76     public LocalThreePhaseCommitCohort onTransactionReady(@Nonnull DOMStoreWriteTransaction tx,
  77             @Nullable Exception operationError) {
  78         if(operationError != null) {
  79             return new LocalThreePhaseCommitCohort(actorContext, leader,
  80                     (SnapshotBackedWriteTransaction<TransactionIdentifier>)tx, operationError);
  81         }
  82
  83         try {
  84             return (LocalThreePhaseCommitCohort) tx.ready();
  85         } catch (Exception e) {
  86             // Unfortunately we need to cast to SnapshotBackedWriteTransaction here as it's required by
  87             // LocalThreePhaseCommitCohort.
  88             return new LocalThreePhaseCommitCohort(actorContext, leader,
  89                     (SnapshotBackedWriteTransaction<TransactionIdentifier>)tx, e);
  90         }
  91     }
  92 }