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 import static org.opendaylight.controller.md.sal.dom.broker.impl.legacy.sharded.adapter.LegacyShardedDOMDataBrokerAdapterUtils.translateDataStoreType;
  13
  14 import com.google.common.base.Optional;
  15 import com.google.common.util.concurrent.CheckedFuture;
  16 import com.google.common.util.concurrent.Futures;
  17 import com.google.common.util.concurrent.MoreExecutors;
  18 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  19 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
  20 import org.opendaylight.controller.md.sal.dom.api.DOMDataReadOnlyTransaction;
  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 /**
  26  * Read transaction that delegates calls to {@link org.opendaylight.mdsal.dom.broker.ShardedDOMReadTransactionAdapter},
  27  * which in turn translates calls to shard aware implementation of
  28  * {@link org.opendaylight.mdsal.dom.api.DOMDataTreeService}.
  29  *
  30  * <p>
  31  * Since reading data distributed on different subshards is not guaranteed to
  32  * return all relevant data, we cannot guarantee it neither. Best effort is to
  33  * return all data we get from first initial data change event received.
  34  */
  35 class ShardedDOMDataBrokerDelegatingReadTransaction implements DOMDataReadOnlyTransaction {
  36     private final DOMDataTreeReadTransaction delegateTx;
  37     private final Object txIdentifier;
  38
  39     ShardedDOMDataBrokerDelegatingReadTransaction(final Object txIdentifier,
  40                                                          final DOMDataTreeReadTransaction delegateTx) {
  41         this.delegateTx = checkNotNull(delegateTx);
  42         this.txIdentifier = checkNotNull(txIdentifier);
  43     }
  44
  45     @Override
  46     public CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> read(final LogicalDatastoreType store,
  47                                                                                    final YangInstanceIdentifier path) {
  48         return Futures.makeChecked(delegateTx.read(translateDataStoreType(store), path).transformAsync(
  49             optional -> Futures.immediateFuture(Optional.fromJavaUtil(optional)), MoreExecutors.directExecutor()),
  50             ReadFailedException.MAPPER);
  51     }
  52
  53     @Override
  54     public CheckedFuture<Boolean, ReadFailedException> exists(final LogicalDatastoreType store,
  55                                                               final YangInstanceIdentifier path) {
  56         return Futures.makeChecked(
  57                 delegateTx.exists(LegacyShardedDOMDataBrokerAdapterUtils.translateDataStoreType(store), path),
  58                 ReadFailedException.MAPPER);
  59     }
  60
  61     @Override
  62     public Object getIdentifier() {
  63         return txIdentifier;
  64     }
  65
  66     @Override
  67     public void close() {
  68         delegateTx.close();
  69     }
  70 }