opendaylight/md-sal/sal-dom-broker/src/main/java/org/opendaylight/controller/md/sal/dom/broker/impl/legacy/sharded/adapter/ShardedDOMDataBrokerDelegatingReadTransaction.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.controller.md.sal.dom.broker.impl.legacy.sharded.adapter;
  10
  11 import static com.google.common.base.Preconditions.checkNotNull;
  12
  13 import com.google.common.base.Optional;
  14 import com.google.common.util.concurrent.CheckedFuture;
  15 import com.google.common.util.concurrent.Futures;
  16 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  17 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
  18 import org.opendaylight.controller.md.sal.dom.api.DOMDataReadOnlyTransaction;
  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 /**
  24  * Read transaction that delegates calls to {@link org.opendaylight.mdsal.dom.broker.ShardedDOMReadTransactionAdapter},
  25  * which in turn translates calls to shard aware implementation of
  26  * {@link org.opendaylight.mdsal.dom.api.DOMDataTreeService}.
  27  *
  28  * <p>
  29  * Since reading data distributed on different subshards is not guaranteed to
  30  * return all relevant data, we cannot guarantee it neither. Best effort is to
  31  * return all data we get from first initial data change event received.
  32  */
  33 class ShardedDOMDataBrokerDelegatingReadTransaction implements DOMDataReadOnlyTransaction {
  34     private final DOMDataTreeReadTransaction delegateTx;
  35     private final Object txIdentifier;
  36
  37     ShardedDOMDataBrokerDelegatingReadTransaction(final Object txIdentifier,
  38                                                          final DOMDataTreeReadTransaction delegateTx) {
  39         this.delegateTx = checkNotNull(delegateTx);
  40         this.txIdentifier = checkNotNull(txIdentifier);
  41     }
  42
  43     @Override
  44     public CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> read(final LogicalDatastoreType store,
  45                                                                                    final YangInstanceIdentifier path) {
  46         return Futures.makeChecked(
  47                 delegateTx.read(LegacyShardedDOMDataBrokerAdapterUtils.translateDataStoreType(store), path),
  48                 ReadFailedException.MAPPER);
  49     }
  50
  51     @Override
  52     public CheckedFuture<Boolean, ReadFailedException> exists(final LogicalDatastoreType store,
  53                                                               final YangInstanceIdentifier path) {
  54         return Futures.makeChecked(
  55                 delegateTx.exists(LegacyShardedDOMDataBrokerAdapterUtils.translateDataStoreType(store), path),
  56                 ReadFailedException.MAPPER);
  57     }
  58
  59     @Override
  60     public Object getIdentifier() {
  61         return txIdentifier;
  62     }
  63
  64     @Override
  65     public void close() {
  66         delegateTx.close();
  67     }
  68 }