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