opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/NoOpDOMStoreThreePhaseCommitCohort.java

   1 /*
   2  * Copyright (c) 2015 Brocade Communications 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.controller.cluster.datastore;
   9
  10 import com.google.common.util.concurrent.ListenableFuture;
  11 import java.util.Collections;
  12 import java.util.List;
  13 import org.opendaylight.mdsal.common.api.CommitInfo;
  14 import org.opendaylight.yangtools.yang.common.Empty;
  15 import scala.concurrent.Future;
  16
  17 /**
  18  * A {@link org.opendaylight.controller.sal.core.spi.data.DOMStoreThreePhaseCommitCohort}
  19  * instance given out for empty transactions.
  20  */
  21 final class NoOpDOMStoreThreePhaseCommitCohort extends AbstractThreePhaseCommitCohort<Object> {
  22     static final NoOpDOMStoreThreePhaseCommitCohort INSTANCE = new NoOpDOMStoreThreePhaseCommitCohort();
  23
  24     private NoOpDOMStoreThreePhaseCommitCohort() {
  25         // Hidden to prevent instantiation
  26     }
  27
  28     @Override
  29     public ListenableFuture<Boolean> canCommit() {
  30         return IMMEDIATE_BOOLEAN_SUCCESS;
  31     }
  32
  33     @Override
  34     public ListenableFuture<Empty> preCommit() {
  35         return IMMEDIATE_EMPTY_SUCCESS;
  36     }
  37
  38     @Override
  39     public ListenableFuture<Empty> abort() {
  40         return IMMEDIATE_EMPTY_SUCCESS;
  41     }
  42
  43     @Override
  44     public ListenableFuture<CommitInfo> commit() {
  45         return CommitInfo.emptyFluentFuture();
  46     }
  47
  48     @Override
  49     List<Future<Object>> getCohortFutures() {
  50         return Collections.emptyList();
  51     }
  52 }