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     private final LocalTransactionReadySupport readySupport;
  33     private Exception operationError;
  34
  35     LocalTransactionContext(DOMStoreTransaction txDelegate, TransactionIdentifier identifier,
  36             LocalTransactionReadySupport readySupport) {
  37         super(identifier);
  38         this.txDelegate = Preconditions.checkNotNull(txDelegate);
  39         this.readySupport = readySupport;
  40     }
  41
  42     protected abstract DOMStoreWriteTransaction getWriteDelegate();
  43
  44     protected abstract DOMStoreReadTransaction getReadDelegate();
  45
  46     @Override
  47     public void writeData(YangInstanceIdentifier path, NormalizedNode<?, ?> data) {
  48         incrementModificationCount();
  49         if(operationError == null) {
  50             try {
  51                 getWriteDelegate().write(path, data);
  52             } catch (Exception e) {
  53                 operationError = e;
  54             }
  55         }
  56
  57     }
  58
  59     @Override
  60     public void mergeData(YangInstanceIdentifier path, NormalizedNode<?, ?> data) {
  61         incrementModificationCount();
  62         if(operationError == null) {
  63             try {
  64                 getWriteDelegate().merge(path, data);
  65             } catch (Exception e) {
  66                 operationError = e;
  67             }
  68         }
  69     }
  70
  71     @Override
  72     public void deleteData(YangInstanceIdentifier path) {
  73         incrementModificationCount();
  74         if(operationError == null) {
  75             try {
  76                 getWriteDelegate().delete(path);
  77             } catch (Exception e) {
  78                 operationError = e;
  79             }
  80         }
  81     }
  82
  83     @Override
  84     public void readData(YangInstanceIdentifier path, final SettableFuture<Optional<NormalizedNode<?, ?>>> proxyFuture) {
  85         Futures.addCallback(getReadDelegate().read(path), new FutureCallback<Optional<NormalizedNode<?, ?>>>() {
  86             @Override
  87             public void onSuccess(final Optional<NormalizedNode<?, ?>> result) {
  88                 proxyFuture.set(result);
  89             }
  90
  91             @Override
  92             public void onFailure(final Throwable t) {
  93                 proxyFuture.setException(t);
  94             }
  95         });
  96     }
  97
  98     @Override
  99     public void dataExists(YangInstanceIdentifier path, final SettableFuture<Boolean> proxyFuture) {
 100         Futures.addCallback(getReadDelegate().exists(path), new FutureCallback<Boolean>() {
 101             @Override
 102             public void onSuccess(final Boolean result) {
 103                 proxyFuture.set(result);
 104             }
 105
 106             @Override
 107             public void onFailure(final Throwable t) {
 108                 proxyFuture.setException(t);
 109             }
 110         });
 111     }
 112
 113     private LocalThreePhaseCommitCohort ready() {
 114         logModificationCount();
 115         LocalThreePhaseCommitCohort cohort = readySupport.onTransactionReady(getWriteDelegate());
 116         cohort.setOperationError(operationError);
 117         return cohort;
 118     }
 119
 120     @Override
 121     public Future<ActorSelection> readyTransaction() {
 122         final LocalThreePhaseCommitCohort cohort = ready();
 123         return cohort.initiateCoordinatedCommit();
 124     }
 125
 126     @Override
 127     public Future<Object> directCommit() {
 128         final LocalThreePhaseCommitCohort cohort = ready();
 129         return cohort.initiateDirectCommit();
 130     }
 131
 132     @Override
 133     public boolean supportsDirectCommit() {
 134         return true;
 135     }
 136
 137     @Override
 138     public void closeTransaction() {
 139         txDelegate.close();
 140     }
 141 }