opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/LocalTransactionContext.java

   1 /*
   2  * Copyright (c) 2015 Brocade Communications 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.Optional;
  12 import com.google.common.base.Preconditions;
  13 import com.google.common.util.concurrent.FutureCallback;
  14 import com.google.common.util.concurrent.Futures;
  15 import com.google.common.util.concurrent.SettableFuture;
  16 import org.opendaylight.controller.cluster.datastore.identifiers.TransactionIdentifier;
  17 import org.opendaylight.controller.sal.core.spi.data.DOMStoreReadTransaction;
  18 import org.opendaylight.controller.sal.core.spi.data.DOMStoreTransaction;
  19 import org.opendaylight.controller.sal.core.spi.data.DOMStoreWriteTransaction;
  20 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  21 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  22 import scala.concurrent.Future;
  23
  24 /**
  25  * Processes front-end transaction operations locally before being committed to the destination shard.
  26  * Instances of this class are used when the destination shard is local to the caller.
  27  *
  28  * @author Thomas Pantelis
  29  */
  30 abstract class LocalTransactionContext extends AbstractTransactionContext {
  31     private final DOMStoreTransaction txDelegate;
  32
  33     LocalTransactionContext(DOMStoreTransaction txDelegate, TransactionIdentifier identifier) {
  34         super(identifier);
  35         this.txDelegate = Preconditions.checkNotNull(txDelegate);
  36     }
  37
  38     protected abstract DOMStoreWriteTransaction getWriteDelegate();
  39
  40     protected abstract DOMStoreReadTransaction getReadDelegate();
  41
  42     @Override
  43     public void writeData(YangInstanceIdentifier path, NormalizedNode<?, ?> data) {
  44         incrementModificationCount();
  45         getWriteDelegate().write(path, data);
  46     }
  47
  48     @Override
  49     public void mergeData(YangInstanceIdentifier path, NormalizedNode<?, ?> data) {
  50         incrementModificationCount();
  51         getWriteDelegate().merge(path, data);
  52     }
  53
  54     @Override
  55     public void deleteData(YangInstanceIdentifier path) {
  56         incrementModificationCount();
  57         getWriteDelegate().delete(path);
  58     }
  59
  60     @Override
  61     public void readData(YangInstanceIdentifier path, final SettableFuture<Optional<NormalizedNode<?, ?>>> proxyFuture) {
  62         Futures.addCallback(getReadDelegate().read(path), new FutureCallback<Optional<NormalizedNode<?, ?>>>() {
  63             @Override
  64             public void onSuccess(final Optional<NormalizedNode<?, ?>> result) {
  65                 proxyFuture.set(result);
  66             }
  67
  68             @Override
  69             public void onFailure(final Throwable t) {
  70                 proxyFuture.setException(t);
  71             }
  72         });
  73     }
  74
  75     @Override
  76     public void dataExists(YangInstanceIdentifier path, final SettableFuture<Boolean> proxyFuture) {
  77         Futures.addCallback(getReadDelegate().exists(path), new FutureCallback<Boolean>() {
  78             @Override
  79             public void onSuccess(final Boolean result) {
  80                 proxyFuture.set(result);
  81             }
  82
  83             @Override
  84             public void onFailure(final Throwable t) {
  85                 proxyFuture.setException(t);
  86             }
  87         });
  88     }
  89
  90     private LocalThreePhaseCommitCohort ready() {
  91         logModificationCount();
  92         return (LocalThreePhaseCommitCohort) getWriteDelegate().ready();
  93     }
  94
  95     @Override
  96     public Future<ActorSelection> readyTransaction() {
  97         final LocalThreePhaseCommitCohort cohort = ready();
  98         return cohort.initiateCoordinatedCommit();
  99     }
 100
 101     @Override
 102     public Future<Object> directCommit() {
 103         final LocalThreePhaseCommitCohort cohort = ready();
 104         return cohort.initiateDirectCommit();
 105     }
 106
 107     @Override
 108     public boolean supportsDirectCommit() {
 109         return true;
 110     }
 111
 112     @Override
 113     public void closeTransaction() {
 114         txDelegate.close();
 115     }
 116 }