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         incrementModificationCount();
  48         getWriteDelegate().write(path, data);
  49         completer.onComplete(null, null);
  50     }
  51
  52     @Override
  53     public void mergeData(YangInstanceIdentifier path, NormalizedNode<?, ?> data) {
  54         incrementModificationCount();
  55         getWriteDelegate().merge(path, data);
  56         completer.onComplete(null, null);
  57     }
  58
  59     @Override
  60     public void deleteData(YangInstanceIdentifier path) {
  61         incrementModificationCount();
  62         getWriteDelegate().delete(path);
  63         completer.onComplete(null, null);
  64     }
  65
  66     @Override
  67     public void readData(YangInstanceIdentifier path, final SettableFuture<Optional<NormalizedNode<?, ?>>> proxyFuture) {
  68         Futures.addCallback(getReadDelegate().read(path), new FutureCallback<Optional<NormalizedNode<?, ?>>>() {
  69             @Override
  70             public void onSuccess(Optional<NormalizedNode<?, ?>> result) {
  71                 proxyFuture.set(result);
  72                 completer.onComplete(null, null);
  73             }
  74
  75             @Override
  76             public void onFailure(Throwable t) {
  77                 proxyFuture.setException(t);
  78                 completer.onComplete(null, null);
  79             }
  80         });
  81     }
  82
  83     @Override
  84     public void dataExists(YangInstanceIdentifier path, final SettableFuture<Boolean> proxyFuture) {
  85         Futures.addCallback(getReadDelegate().exists(path), new FutureCallback<Boolean>() {
  86             @Override
  87             public void onSuccess(Boolean result) {
  88                 proxyFuture.set(result);
  89                 completer.onComplete(null, null);
  90             }
  91
  92             @Override
  93             public void onFailure(Throwable t) {
  94                 proxyFuture.setException(t);
  95                 completer.onComplete(null, null);
  96             }
  97         });
  98     }
  99
 100     private LocalThreePhaseCommitCohort ready() {
 101         logModificationCount();
 102         LocalThreePhaseCommitCohort ready = (LocalThreePhaseCommitCohort) getWriteDelegate().ready();
 103         completer.onComplete(null, null);
 104         return ready;
 105     }
 106
 107     @Override
 108     public Future<ActorSelection> readyTransaction() {
 109         return ready().initiateCoordinatedCommit();
 110     }
 111
 112     @Override
 113     public Future<Object> directCommit() {
 114         return ready().initiateDirectCommit();
 115     }
 116
 117     @Override
 118     public boolean supportsDirectCommit() {
 119         return true;
 120     }
 121
 122     @Override
 123     public void closeTransaction() {
 124         txDelegate.close();
 125     }
 126 }