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