opendaylight/md-sal/sal-inmemory-datastore/src/main/java/org/opendaylight/controller/md/sal/dom/store/impl/SnapshotBackedReadWriteTransaction.java

   1 /*
   2  * Copyright (c) 2014 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 package org.opendaylight.controller.md.sal.dom.store.impl;
   9
  10 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeSnapshot;
  11 import org.opendaylight.controller.sal.core.spi.data.DOMStoreReadWriteTransaction;
  12 import org.opendaylight.yangtools.yang.data.api.InstanceIdentifier;
  13 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  14 import org.slf4j.Logger;
  15 import org.slf4j.LoggerFactory;
  16
  17 import com.google.common.base.Optional;
  18 import com.google.common.util.concurrent.Futures;
  19 import com.google.common.util.concurrent.ListenableFuture;
  20
  21 /**
  22  * Implementation of Read-Write transaction which is backed by {@link DataTreeSnapshot}
  23  * and executed according to {@link TransactionReadyPrototype}.
  24  *
  25  */
  26 class SnapshotBackedReadWriteTransaction extends SnapshotBackedWriteTransaction implements
  27 DOMStoreReadWriteTransaction {
  28
  29     private static final Logger LOG = LoggerFactory.getLogger(SnapshotBackedReadWriteTransaction.class);
  30
  31     /**
  32      * Creates new read-write transaction.
  33      *
  34      * @param identifier transaction Identifier
  35      * @param snapshot Snapshot which will be modified.
  36      * @param readyImpl Implementation of ready method.
  37      */
  38     protected SnapshotBackedReadWriteTransaction(final Object identifier, final DataTreeSnapshot snapshot,
  39             final TransactionReadyPrototype store) {
  40         super(identifier, snapshot, store);
  41     }
  42
  43     @Override
  44     public ListenableFuture<Optional<NormalizedNode<?, ?>>> read(final InstanceIdentifier path) {
  45         LOG.debug("Tx: {} Read: {}", getIdentifier(), path);
  46         try {
  47             return Futures.immediateFuture(getMutatedView().readNode(path));
  48         } catch (Exception e) {
  49             LOG.error("Tx: {} Failed Read of {}", getIdentifier(), path, e);
  50             throw e;
  51         }
  52     }
  53 }