dom/mdsal-dom-inmemory-datastore/src/main/java/org/opendaylight/mdsal/dom/store/inmemory/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
   9 package org.opendaylight.mdsal.dom.store.inmemory;
  10
  11 import com.google.common.base.Preconditions;
  12 import com.google.common.util.concurrent.Futures;
  13 import com.google.common.util.concurrent.ListenableFuture;
  14 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
  15 import org.opendaylight.mdsal.dom.spi.shard.ForeignShardModificationContext;
  16 import org.opendaylight.mdsal.dom.spi.store.DOMStoreThreePhaseCommitCohort;
  17 import org.slf4j.Logger;
  18 import org.slf4j.LoggerFactory;
  19
  20 public class ForeignShardThreePhaseCommitCohort implements DOMStoreThreePhaseCommitCohort {
  21
  22     private static final Logger LOG = LoggerFactory.getLogger(ForeignShardThreePhaseCommitCohort.class);
  23
  24     private static final ListenableFuture<Boolean> SUCCESS_VALIDATE = Futures.immediateFuture(Boolean.TRUE);
  25     private static final ListenableFuture<Void> SUCCESS_FUTURE = Futures.immediateFuture(null);
  26
  27     private final DOMDataTreeIdentifier prefix;
  28     private final ForeignShardModificationContext shard;
  29
  30     public ForeignShardThreePhaseCommitCohort(final DOMDataTreeIdentifier prefix,
  31             final ForeignShardModificationContext shard) {
  32         this.prefix = Preconditions.checkNotNull(prefix);
  33         this.shard = Preconditions.checkNotNull(shard);
  34     }
  35
  36     @Override
  37     public ListenableFuture<Boolean> canCommit() {
  38         LOG.debug("Validating transaction on foreign shard {}", prefix);
  39         return shard.isModified() ? shard.validate() : SUCCESS_VALIDATE;
  40     }
  41
  42     @Override
  43     public ListenableFuture<Void> preCommit() {
  44         LOG.debug("Preparing transaction on foreign shard {}", prefix);
  45         return shard.isModified() ? shard.prepare() : SUCCESS_FUTURE;
  46     }
  47
  48     @Override
  49     public ListenableFuture<Void> abort() {
  50         LOG.debug("Aborting transaction of foreign shard {}", prefix);
  51         shard.closeForeignTransaction();
  52         return Futures.immediateFuture(null);
  53     }
  54
  55     @Override
  56     public ListenableFuture<Void> commit() {
  57         LOG.debug("Submitting transaction on foreign shard {}", prefix);
  58         return shard.isModified() ? shard.submit() : SUCCESS_FUTURE;
  59     }
  60 }