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