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 static java.util.Objects.requireNonNull;
  12
  13 import com.google.common.util.concurrent.Futures;
  14 import com.google.common.util.concurrent.ListenableFuture;
  15 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
  16 import org.opendaylight.mdsal.dom.spi.shard.ForeignShardModificationContext;
  17 import org.opendaylight.mdsal.dom.spi.store.DOMStoreThreePhaseCommitCohort;
  18 import org.slf4j.Logger;
  19 import org.slf4j.LoggerFactory;
  20
  21 public class ForeignShardThreePhaseCommitCohort implements DOMStoreThreePhaseCommitCohort {
  22
  23     private static final Logger LOG = LoggerFactory.getLogger(ForeignShardThreePhaseCommitCohort.class);
  24
  25     private static final ListenableFuture<Boolean> SUCCESS_VALIDATE = Futures.immediateFuture(Boolean.TRUE);
  26     private static final ListenableFuture<Void> SUCCESS_FUTURE = Futures.immediateFuture(null);
  27
  28     private final DOMDataTreeIdentifier prefix;
  29     private final ForeignShardModificationContext shard;
  30
  31     public ForeignShardThreePhaseCommitCohort(final DOMDataTreeIdentifier prefix,
  32             final ForeignShardModificationContext shard) {
  33         this.prefix = requireNonNull(prefix);
  34         this.shard = requireNonNull(shard);
  35     }
  36
  37     @Override
  38     public ListenableFuture<Boolean> canCommit() {
  39         LOG.debug("Validating transaction on foreign shard {}", prefix);
  40         return shard.isModified() ? shard.validate() : SUCCESS_VALIDATE;
  41     }
  42
  43     @Override
  44     public ListenableFuture<Void> preCommit() {
  45         LOG.debug("Preparing transaction on foreign shard {}", prefix);
  46         return shard.isModified() ? shard.prepare() : SUCCESS_FUTURE;
  47     }
  48
  49     @Override
  50     public ListenableFuture<Void> abort() {
  51         LOG.debug("Aborting transaction of foreign shard {}", prefix);
  52         shard.closeForeignTransaction();
  53         return SUCCESS_FUTURE;
  54     }
  55
  56     @Override
  57     public ListenableFuture<Void> commit() {
  58         LOG.debug("Submitting transaction on foreign shard {}", prefix);
  59         return shard.isModified() ? shard.submit() : SUCCESS_FUTURE;
  60     }
  61 }