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