dom/mdsal-dom-broker/src/main/java/org/opendaylight/mdsal/dom/broker/TransactionChainReadTransaction.java

   1 /*
   2  * Copyright (c) 2016 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
   9 package org.opendaylight.mdsal.dom.broker;
  10
  11 import com.google.common.util.concurrent.FluentFuture;
  12 import com.google.common.util.concurrent.FutureCallback;
  13 import com.google.common.util.concurrent.MoreExecutors;
  14 import com.google.common.util.concurrent.SettableFuture;
  15 import java.util.Optional;
  16 import javax.annotation.Nullable;
  17 import org.opendaylight.mdsal.common.api.CommitInfo;
  18 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
  19 import org.opendaylight.mdsal.dom.api.DOMDataTreeReadTransaction;
  20 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  21 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  22
  23 public class TransactionChainReadTransaction implements DOMDataTreeReadTransaction {
  24
  25     private final DOMDataTreeReadTransaction delegateReadTx;
  26     private final FluentFuture<? extends CommitInfo> previousWriteTxFuture;
  27     private final Object identifier;
  28     private final ShardedDOMTransactionChainAdapter txChain;
  29
  30     TransactionChainReadTransaction(final Object txIdentifier, final DOMDataTreeReadTransaction delegateReadTx,
  31                                     final FluentFuture<? extends CommitInfo> previousWriteTxFuture,
  32                                     final ShardedDOMTransactionChainAdapter txChain) {
  33         this.delegateReadTx = delegateReadTx;
  34         this.previousWriteTxFuture = previousWriteTxFuture;
  35         this.identifier = txIdentifier;
  36         this.txChain = txChain;
  37     }
  38
  39     @Override
  40     public FluentFuture<Optional<NormalizedNode<?, ?>>> read(final LogicalDatastoreType store,
  41             final YangInstanceIdentifier path) {
  42         final SettableFuture<Optional<NormalizedNode<?, ?>>> readResult = SettableFuture.create();
  43
  44         previousWriteTxFuture.addCallback(new FutureCallback<CommitInfo>() {
  45             @Override
  46             public void onSuccess(@Nullable final CommitInfo result) {
  47                 delegateReadTx.read(store, path).addCallback(new FutureCallback<Optional<NormalizedNode<?, ?>>>() {
  48                     @Override
  49                     public void onSuccess(@Nullable final Optional<NormalizedNode<?, ?>> result) {
  50                         readResult.set(result);
  51                     }
  52
  53                     @Override
  54                     public void onFailure(final Throwable throwable) {
  55                         txChain.transactionFailed(TransactionChainReadTransaction.this, throwable);
  56                         readResult.setException(throwable);
  57                     }
  58                 }, MoreExecutors.directExecutor());
  59             }
  60
  61             @Override
  62             public void onFailure(final Throwable throwable) {
  63                 // we don't have to notify txchain about this failure
  64                 // failed write transaction should do this
  65                 readResult.setException(throwable);
  66             }
  67         }, MoreExecutors.directExecutor());
  68
  69         return readResult;
  70     }
  71
  72     @Override
  73     public FluentFuture<Boolean> exists(final LogicalDatastoreType store, final YangInstanceIdentifier path) {
  74         return read(store, path).transform(Optional::isPresent, MoreExecutors.directExecutor());
  75     }
  76
  77     @Override
  78     public void close() {
  79         delegateReadTx.close();
  80         txChain.closeReadTransaction();
  81     }
  82
  83     @Override
  84     public Object getIdentifier() {
  85         return identifier;
  86     }
  87 }