dom/mdsal-dom-spi/src/main/java/org/opendaylight/mdsal/dom/spi/shard/ForeignShardThreePhaseCommitCohort.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 package org.opendaylight.mdsal.dom.spi.shard;
   9
  10 import static java.util.Objects.requireNonNull;
  11
  12 import com.google.common.annotations.Beta;
  13 import com.google.common.util.concurrent.ListenableFuture;
  14 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
  15 import org.opendaylight.mdsal.dom.spi.store.DOMStoreThreePhaseCommitCohort;
  16 import org.opendaylight.yangtools.util.concurrent.FluentFutures;
  17 import org.slf4j.Logger;
  18 import org.slf4j.LoggerFactory;
  19
  20 @Beta
  21 public class ForeignShardThreePhaseCommitCohort implements DOMStoreThreePhaseCommitCohort {
  22     private static final Logger LOG = LoggerFactory.getLogger(ForeignShardThreePhaseCommitCohort.class);
  23
  24     private final DOMDataTreeIdentifier prefix;
  25     private final ForeignShardModificationContext shard;
  26
  27     public ForeignShardThreePhaseCommitCohort(final DOMDataTreeIdentifier prefix,
  28             final ForeignShardModificationContext shard) {
  29         this.prefix = requireNonNull(prefix);
  30         this.shard = requireNonNull(shard);
  31     }
  32
  33     @Override
  34     public ListenableFuture<Boolean> canCommit() {
  35         LOG.debug("Validating transaction on foreign shard {}", prefix);
  36         return shard.isModified() ? shard.validate() : FluentFutures.immediateTrueFluentFuture();
  37     }
  38
  39     @Override
  40     public ListenableFuture<Void> preCommit() {
  41         LOG.debug("Preparing transaction on foreign shard {}", prefix);
  42         return shard.isModified() ? shard.prepare() : FluentFutures.immediateNullFluentFuture();
  43     }
  44
  45     @Override
  46     public ListenableFuture<Void> abort() {
  47         LOG.debug("Aborting transaction of foreign shard {}", prefix);
  48         shard.closeForeignTransaction();
  49         return FluentFutures.immediateNullFluentFuture();
  50     }
  51
  52     @Override
  53     public ListenableFuture<Void> commit() {
  54         LOG.debug("Submitting transaction on foreign shard {}", prefix);
  55         return shard.isModified() ? shard.submit() : FluentFutures.immediateNullFluentFuture();
  56     }
  57 }