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.base.Function;
  12 import com.google.common.base.Optional;
  13 import com.google.common.util.concurrent.CheckedFuture;
  14 import com.google.common.util.concurrent.FutureCallback;
  15 import com.google.common.util.concurrent.Futures;
  16 import com.google.common.util.concurrent.ListenableFuture;
  17 import com.google.common.util.concurrent.MoreExecutors;
  18 import com.google.common.util.concurrent.SettableFuture;
  19 import javax.annotation.Nullable;
  20 import org.opendaylight.mdsal.common.api.CommitInfo;
  21 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
  22 import org.opendaylight.mdsal.common.api.ReadFailedException;
  23 import org.opendaylight.mdsal.dom.api.DOMDataTreeReadTransaction;
  24 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  25 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  26
  27 public class TransactionChainReadTransaction implements DOMDataTreeReadTransaction {
  28
  29     private final DOMDataTreeReadTransaction delegateReadTx;
  30     private final ListenableFuture<? extends CommitInfo> previousWriteTxFuture;
  31     private final Object identifier;
  32     private final ShardedDOMTransactionChainAdapter txChain;
  33
  34     TransactionChainReadTransaction(final Object txIdentifier, final DOMDataTreeReadTransaction delegateReadTx,
  35                                     final ListenableFuture<? extends CommitInfo> previousWriteTxFuture,
  36                                     final ShardedDOMTransactionChainAdapter txChain) {
  37         this.delegateReadTx = delegateReadTx;
  38         this.previousWriteTxFuture = previousWriteTxFuture;
  39         this.identifier = txIdentifier;
  40         this.txChain = txChain;
  41     }
  42
  43     @Override
  44     public CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> read(final LogicalDatastoreType store,
  45             final YangInstanceIdentifier path) {
  46         final SettableFuture<Optional<NormalizedNode<?, ?>>> readResult = SettableFuture.create();
  47
  48         Futures.addCallback(previousWriteTxFuture, new FutureCallback<CommitInfo>() {
  49             @Override
  50             public void onSuccess(@Nullable final CommitInfo result) {
  51                 Futures.addCallback(delegateReadTx.read(store, path),
  52                     new FutureCallback<Optional<NormalizedNode<?, ?>>>() {
  53
  54                         @Override
  55                         public void onSuccess(@Nullable final Optional<NormalizedNode<?, ?>> result) {
  56                             readResult.set(result);
  57                         }
  58
  59                         @Override
  60                         public void onFailure(final Throwable throwable) {
  61                             txChain.transactionFailed(TransactionChainReadTransaction.this, throwable);
  62                             readResult.setException(throwable);
  63                         }
  64                     }, MoreExecutors.directExecutor());
  65             }
  66
  67             @Override
  68             public void onFailure(final Throwable throwable) {
  69                 // we don't have to notify txchain about this failure
  70                 // failed write transaction should do this
  71                 readResult.setException(throwable);
  72             }
  73         }, MoreExecutors.directExecutor());
  74
  75         return Futures.makeChecked(readResult, ReadFailedException.MAPPER);
  76     }
  77
  78     @Override
  79     public CheckedFuture<Boolean, ReadFailedException> exists(final LogicalDatastoreType store,
  80                                                               final YangInstanceIdentifier path) {
  81         final Function<Optional<NormalizedNode<?, ?>>, Boolean> transform =
  82             optionalNode -> optionalNode.isPresent() ? Boolean.TRUE : Boolean.FALSE;
  83         final ListenableFuture<Boolean> existsResult = Futures.transform(read(store, path), transform,
  84             MoreExecutors.directExecutor());
  85         return Futures.makeChecked(existsResult, ReadFailedException.MAPPER);
  86     }
  87
  88     @Override
  89     public void close() {
  90         delegateReadTx.close();
  91         txChain.closeReadTransaction();
  92     }
  93
  94     @Override
  95     public Object getIdentifier() {
  96         return identifier;
  97     }
  98 }