opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ThreePhaseCommitCohortProxy.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.ActorPath;
  12 import akka.actor.ActorSelection;
  13 import com.google.common.util.concurrent.ListenableFuture;
  14 import com.google.common.util.concurrent.ListenableFutureTask;
  15 import org.opendaylight.controller.cluster.datastore.messages.AbortTransaction;
  16 import org.opendaylight.controller.cluster.datastore.messages.AbortTransactionReply;
  17 import org.opendaylight.controller.cluster.datastore.messages.CanCommitTransaction;
  18 import org.opendaylight.controller.cluster.datastore.messages.CanCommitTransactionReply;
  19 import org.opendaylight.controller.cluster.datastore.messages.CommitTransaction;
  20 import org.opendaylight.controller.cluster.datastore.messages.CommitTransactionReply;
  21 import org.opendaylight.controller.cluster.datastore.messages.PreCommitTransaction;
  22 import org.opendaylight.controller.cluster.datastore.messages.PreCommitTransactionReply;
  23 import org.opendaylight.controller.cluster.datastore.utils.ActorContext;
  24 import org.opendaylight.controller.sal.core.spi.data.DOMStoreThreePhaseCommitCohort;
  25 import org.slf4j.Logger;
  26 import org.slf4j.LoggerFactory;
  27
  28 import java.util.Collections;
  29 import java.util.List;
  30 import java.util.concurrent.Callable;
  31 import java.util.concurrent.ExecutorService;
  32 import java.util.concurrent.Executors;
  33
  34 /**
  35  * ThreePhaseCommitCohortProxy represents a set of remote cohort proxies
  36  */
  37 public class ThreePhaseCommitCohortProxy implements
  38     DOMStoreThreePhaseCommitCohort{
  39
  40     private static final Logger
  41         LOG = LoggerFactory.getLogger(DistributedDataStore.class);
  42
  43     private final ActorContext actorContext;
  44     private final List<ActorPath> cohortPaths;
  45     //FIXME : Use a thread pool here
  46     private final ExecutorService executorService = Executors.newSingleThreadExecutor();
  47
  48
  49     public ThreePhaseCommitCohortProxy(ActorContext actorContext, List<ActorPath> cohortPaths) {
  50         this.actorContext = actorContext;
  51         this.cohortPaths = cohortPaths;
  52     }
  53
  54     @Override public ListenableFuture<Boolean> canCommit() {
  55         Callable<Boolean> call = new Callable() {
  56
  57             @Override public Boolean call() throws Exception {
  58             for(ActorPath actorPath : cohortPaths){
  59                 ActorSelection cohort = actorContext.actorSelection(actorPath);
  60
  61                 try {
  62                     Object response =
  63                         actorContext.executeRemoteOperation(cohort,
  64                             new CanCommitTransaction(),
  65                             ActorContext.ASK_DURATION);
  66
  67                     if (response instanceof CanCommitTransactionReply) {
  68                         CanCommitTransactionReply reply =
  69                             (CanCommitTransactionReply) response;
  70                         if (!reply.getCanCommit()) {
  71                             return false;
  72                         }
  73                     }
  74                 } catch(RuntimeException e){
  75                     LOG.error("Unexpected Exception", e);
  76                     return false;
  77                 }
  78
  79
  80             }
  81             return true;
  82             }
  83         };
  84
  85         ListenableFutureTask<Boolean>
  86             future = ListenableFutureTask.create(call);
  87
  88         executorService.submit(future);
  89
  90         return future;
  91     }
  92
  93     @Override public ListenableFuture<Void> preCommit() {
  94         return voidOperation(new PreCommitTransaction(), PreCommitTransactionReply.class);
  95     }
  96
  97     @Override public ListenableFuture<Void> abort() {
  98         return voidOperation(new AbortTransaction(), AbortTransactionReply.class);
  99     }
 100
 101     @Override public ListenableFuture<Void> commit() {
 102         return voidOperation(new CommitTransaction(), CommitTransactionReply.class);
 103     }
 104
 105     private ListenableFuture<Void> voidOperation(final Object message, final Class expectedResponseClass){
 106         Callable<Void> call = new Callable<Void>() {
 107
 108             @Override public Void call() throws Exception {
 109                 for(ActorPath actorPath : cohortPaths){
 110                     ActorSelection cohort = actorContext.actorSelection(actorPath);
 111
 112                     Object response = actorContext.executeRemoteOperation(cohort,
 113                         message,
 114                         ActorContext.ASK_DURATION);
 115
 116                     if(response != null && !response.getClass().equals(expectedResponseClass)){
 117                         throw new RuntimeException(
 118                             String.format(
 119                                 "did not get the expected response \n\t\t expected : %s \n\t\t actual   : %s",
 120                                 expectedResponseClass.toString(),
 121                                 response.getClass().toString()));
 122                     }
 123                 }
 124                 return null;
 125             }
 126         };
 127
 128         ListenableFutureTask<Void>
 129             future = ListenableFutureTask.create(call);
 130
 131         executorService.submit(future);
 132
 133         return future;
 134
 135     }
 136
 137     public List<ActorPath> getCohortPaths() {
 138         return Collections.unmodifiableList(this.cohortPaths);
 139     }
 140 }