opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/LocalTransactionChain.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.sal.core.spi.data.AbstractSnapshotBackedTransactionChain;
  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.SnapshotBackedWriteTransaction;
  21 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTree;
  22 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeModification;
  23 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeSnapshot;
  24
  25 /**
  26  * Transaction chain instantiated on top of a locally-available DataTree. It does not instantiate
  27  * a transaction in the leader and rather chains transactions on top of themselves.
  28  */
  29 final class LocalTransactionChain extends AbstractSnapshotBackedTransactionChain<TransactionIdentifier>
  30         implements LocalTransactionFactory {
  31     private static final Throwable ABORTED = new Throwable("Transaction aborted");
  32     private final TransactionChainProxy parent;
  33     private final ActorSelection leader;
  34     private final DataTree tree;
  35
  36     LocalTransactionChain(final TransactionChainProxy parent, final ActorSelection leader, final DataTree tree) {
  37         this.parent = Preconditions.checkNotNull(parent);
  38         this.leader = Preconditions.checkNotNull(leader);
  39         this.tree = Preconditions.checkNotNull(tree);
  40     }
  41
  42     DataTree getDataTree() {
  43         return tree;
  44     }
  45
  46     @Override
  47     protected TransactionIdentifier nextTransactionIdentifier() {
  48         throw new UnsupportedOperationException();
  49     }
  50
  51     @Override
  52     protected boolean getDebugTransactions() {
  53         return false;
  54     }
  55
  56     @Override
  57     protected DataTreeSnapshot takeSnapshot() {
  58         return tree.takeSnapshot();
  59     }
  60
  61     @Override
  62     protected DOMStoreThreePhaseCommitCohort createCohort(final SnapshotBackedWriteTransaction<TransactionIdentifier> transaction, final DataTreeModification modification) {
  63         return new LocalChainThreePhaseCommitCohort(transaction, modification);
  64     }
  65
  66     @Override
  67     public DOMStoreReadTransaction newReadOnlyTransaction(TransactionIdentifier identifier) {
  68         return super.newReadOnlyTransaction(identifier);
  69     }
  70
  71     @Override
  72     public DOMStoreReadWriteTransaction newReadWriteTransaction(TransactionIdentifier identifier) {
  73         return super.newReadWriteTransaction(identifier);
  74     }
  75
  76     @Override
  77     public DOMStoreWriteTransaction newWriteOnlyTransaction(TransactionIdentifier identifier) {
  78         return super.newWriteOnlyTransaction(identifier);
  79     }
  80
  81     @SuppressWarnings("unchecked")
  82     @Override
  83     public LocalThreePhaseCommitCohort onTransactionReady(@Nonnull DOMStoreWriteTransaction tx,
  84             @Nullable Exception operationError) {
  85         if(operationError != null) {
  86             return new LocalChainThreePhaseCommitCohort((SnapshotBackedWriteTransaction<TransactionIdentifier>)tx,
  87                     operationError);
  88         }
  89
  90         try {
  91             return (LocalThreePhaseCommitCohort) tx.ready();
  92         } catch (Exception e) {
  93             // Unfortunately we need to cast to SnapshotBackedWriteTransaction here as it's required by
  94             // LocalThreePhaseCommitCohort and the base class.
  95             return new LocalChainThreePhaseCommitCohort((SnapshotBackedWriteTransaction<TransactionIdentifier>)tx, e);
  96         }
  97     }
  98
  99     private class LocalChainThreePhaseCommitCohort extends LocalThreePhaseCommitCohort {
 100
 101         protected LocalChainThreePhaseCommitCohort(SnapshotBackedWriteTransaction<TransactionIdentifier> transaction,
 102                 DataTreeModification modification) {
 103             super(parent.getActorContext(), leader, transaction, modification);
 104         }
 105
 106         protected LocalChainThreePhaseCommitCohort(SnapshotBackedWriteTransaction<TransactionIdentifier> transaction,
 107                 Exception operationError) {
 108             super(parent.getActorContext(), leader, transaction, operationError);
 109         }
 110
 111         @Override
 112         protected void transactionAborted(SnapshotBackedWriteTransaction<TransactionIdentifier> transaction) {
 113             onTransactionFailed(transaction, ABORTED);
 114         }
 115
 116         @Override
 117         protected void transactionCommitted(SnapshotBackedWriteTransaction<TransactionIdentifier> transaction) {
 118             onTransactionCommited(transaction);
 119         }
 120     }
 121 }