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