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

   1 /*
   2  * Copyright (c) 2014 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.cluster.datastore;
  10
  11 import akka.actor.ActorRef;
  12 import akka.actor.PoisonPill;
  13 import akka.actor.Props;
  14 import akka.event.Logging;
  15 import akka.event.LoggingAdapter;
  16 import akka.japi.Creator;
  17
  18 import com.google.common.util.concurrent.FutureCallback;
  19 import com.google.common.util.concurrent.Futures;
  20 import com.google.common.util.concurrent.ListenableFuture;
  21 import org.opendaylight.controller.cluster.common.actor.AbstractUntypedActor;
  22
  23 import org.opendaylight.controller.cluster.datastore.jmx.mbeans.shard.ShardStats;
  24 import org.opendaylight.controller.cluster.datastore.messages.AbortTransaction;
  25 import org.opendaylight.controller.cluster.datastore.messages.AbortTransactionReply;
  26 import org.opendaylight.controller.cluster.datastore.messages.CanCommitTransaction;
  27 import org.opendaylight.controller.cluster.datastore.messages.CanCommitTransactionReply;
  28 import org.opendaylight.controller.cluster.datastore.messages.CommitTransaction;
  29 import org.opendaylight.controller.cluster.datastore.messages.ForwardedCommitTransaction;
  30 import org.opendaylight.controller.cluster.datastore.messages.PreCommitTransaction;
  31 import org.opendaylight.controller.cluster.datastore.messages.PreCommitTransactionReply;
  32 import org.opendaylight.controller.cluster.datastore.modification.CompositeModification;
  33 import org.opendaylight.controller.sal.core.spi.data.DOMStoreThreePhaseCommitCohort;
  34
  35 public class ThreePhaseCommitCohort extends AbstractUntypedActor {
  36     private final DOMStoreThreePhaseCommitCohort cohort;
  37     private final ActorRef shardActor;
  38     private final CompositeModification modification;
  39     private final ShardStats shardStats;
  40
  41     public ThreePhaseCommitCohort(DOMStoreThreePhaseCommitCohort cohort,
  42         ActorRef shardActor, CompositeModification modification, ShardStats shardStats) {
  43
  44         this.cohort = cohort;
  45         this.shardActor = shardActor;
  46         this.modification = modification;
  47         this.shardStats = shardStats;
  48     }
  49
  50     private final LoggingAdapter log =
  51         Logging.getLogger(getContext().system(), this);
  52
  53     public static Props props(final DOMStoreThreePhaseCommitCohort cohort,
  54             final ActorRef shardActor, final CompositeModification modification,
  55             ShardStats shardStats) {
  56         return Props.create(new ThreePhaseCommitCohortCreator(cohort, shardActor, modification,
  57                 shardStats));
  58     }
  59
  60     @Override
  61     public void handleReceive(Object message) throws Exception {
  62         if (message.getClass()
  63             .equals(CanCommitTransaction.SERIALIZABLE_CLASS)) {
  64             canCommit(new CanCommitTransaction());
  65         } else if (message.getClass()
  66             .equals(PreCommitTransaction.SERIALIZABLE_CLASS)) {
  67             preCommit(new PreCommitTransaction());
  68         } else if (message.getClass()
  69             .equals(CommitTransaction.SERIALIZABLE_CLASS)) {
  70             commit(new CommitTransaction());
  71         } else if (message.getClass()
  72             .equals(AbortTransaction.SERIALIZABLE_CLASS)) {
  73             abort(new AbortTransaction());
  74         } else {
  75             unknownMessage(message);
  76         }
  77     }
  78
  79     private void abort(AbortTransaction message) {
  80         final ListenableFuture<Void> future = cohort.abort();
  81         final ActorRef sender = getSender();
  82         final ActorRef self = getSelf();
  83
  84         Futures.addCallback(future, new FutureCallback<Void>() {
  85             @Override
  86             public void onSuccess(Void v) {
  87                 shardStats.incrementAbortTransactionsCount();
  88                 sender
  89                     .tell(new AbortTransactionReply().toSerializable(),
  90                     self);
  91             }
  92
  93             @Override
  94             public void onFailure(Throwable t) {
  95                 LOG.error(t, "An exception happened during abort");
  96                 sender
  97                     .tell(new akka.actor.Status.Failure(t), self);
  98             }
  99         });
 100     }
 101
 102     private void commit(CommitTransaction message) {
 103         // Forward the commit to the shard
 104         log.debug("Forward commit transaction to Shard {} ", shardActor);
 105         shardActor.forward(new ForwardedCommitTransaction(cohort, modification),
 106             getContext());
 107
 108         getContext().parent().tell(PoisonPill.getInstance(), getSelf());
 109
 110     }
 111
 112     private void preCommit(PreCommitTransaction message) {
 113         final ListenableFuture<Void> future = cohort.preCommit();
 114         final ActorRef sender = getSender();
 115         final ActorRef self = getSelf();
 116         Futures.addCallback(future, new FutureCallback<Void>() {
 117             @Override
 118             public void onSuccess(Void v) {
 119                 sender
 120                     .tell(new PreCommitTransactionReply().toSerializable(),
 121                         self);
 122             }
 123
 124             @Override
 125             public void onFailure(Throwable t) {
 126                 LOG.error(t, "An exception happened during pre-commit");
 127                 sender
 128                     .tell(new akka.actor.Status.Failure(t), self);
 129             }
 130         });
 131
 132     }
 133
 134     private void canCommit(CanCommitTransaction message) {
 135         final ListenableFuture<Boolean> future = cohort.canCommit();
 136         final ActorRef sender = getSender();
 137         final ActorRef self = getSelf();
 138         Futures.addCallback(future, new FutureCallback<Boolean>() {
 139             @Override
 140             public void onSuccess(Boolean canCommit) {
 141                 sender.tell(new CanCommitTransactionReply(canCommit)
 142                     .toSerializable(), self);
 143             }
 144
 145             @Override
 146             public void onFailure(Throwable t) {
 147                 LOG.error(t, "An exception happened during canCommit");
 148                 sender
 149                     .tell(new akka.actor.Status.Failure(t), self);
 150             }
 151         });
 152     }
 153
 154     private static class ThreePhaseCommitCohortCreator implements Creator<ThreePhaseCommitCohort> {
 155         final DOMStoreThreePhaseCommitCohort cohort;
 156         final ActorRef shardActor;
 157         final CompositeModification modification;
 158         final ShardStats shardStats;
 159
 160         ThreePhaseCommitCohortCreator(DOMStoreThreePhaseCommitCohort cohort,
 161             ActorRef shardActor, CompositeModification modification, ShardStats shardStats) {
 162             this.cohort = cohort;
 163             this.shardActor = shardActor;
 164             this.modification = modification;
 165             this.shardStats = shardStats;
 166         }
 167
 168         @Override
 169         public ThreePhaseCommitCohort create() throws Exception {
 170             return new ThreePhaseCommitCohort(cohort, shardActor, modification, shardStats);
 171         }
 172     }
 173 }