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.exceptions.TimeoutException;
  16 import org.opendaylight.controller.cluster.datastore.messages.AbortTransaction;
  17 import org.opendaylight.controller.cluster.datastore.messages.AbortTransactionReply;
  18 import org.opendaylight.controller.cluster.datastore.messages.CanCommitTransaction;
  19 import org.opendaylight.controller.cluster.datastore.messages.CanCommitTransactionReply;
  20 import org.opendaylight.controller.cluster.datastore.messages.CommitTransaction;
  21 import org.opendaylight.controller.cluster.datastore.messages.CommitTransactionReply;
  22 import org.opendaylight.controller.cluster.datastore.messages.PreCommitTransaction;
  23 import org.opendaylight.controller.cluster.datastore.messages.PreCommitTransactionReply;
  24 import org.opendaylight.controller.cluster.datastore.utils.ActorContext;
  25 import org.opendaylight.controller.sal.core.spi.data.DOMStoreThreePhaseCommitCohort;
  26 import org.slf4j.Logger;
  27 import org.slf4j.LoggerFactory;
  28
  29 import java.util.Collections;
  30 import java.util.List;
  31 import java.util.concurrent.Callable;
  32 import java.util.concurrent.ExecutorService;
  33 import java.util.concurrent.Executors;
  34
  35 /**
  36  * ThreePhaseCommitCohortProxy represents a set of remote cohort proxies
  37  */
  38 public class ThreePhaseCommitCohortProxy implements
  39     DOMStoreThreePhaseCommitCohort{
  40
  41     private static final Logger
  42         LOG = LoggerFactory.getLogger(DistributedDataStore.class);
  43
  44     private final ActorContext actorContext;
  45     private final List<ActorPath> cohortPaths;
  46     //FIXME : Use a thread pool here
  47     private final ExecutorService executorService = Executors.newSingleThreadExecutor();
  48
  49
  50     public ThreePhaseCommitCohortProxy(ActorContext actorContext, List<ActorPath> cohortPaths) {
  51         this.actorContext = actorContext;
  52         this.cohortPaths = cohortPaths;
  53     }
  54
  55     @Override public ListenableFuture<Boolean> canCommit() {
  56         Callable<Boolean> call = new Callable() {
  57
  58             @Override public Boolean call() throws Exception {
  59             for(ActorPath actorPath : cohortPaths){
  60                 ActorSelection cohort = actorContext.actorSelection(actorPath);
  61
  62                 try {
  63                     Object response =
  64                         actorContext.executeRemoteOperation(cohort,
  65                             new CanCommitTransaction(),
  66                             ActorContext.ASK_DURATION);
  67
  68                     if (response instanceof CanCommitTransactionReply) {
  69                         CanCommitTransactionReply reply =
  70                             (CanCommitTransactionReply) response;
  71                         if (!reply.getCanCommit()) {
  72                             return false;
  73                         }
  74                     }
  75                 } catch(RuntimeException e){
  76                     LOG.error("Unexpected Exception", e);
  77                     return false;
  78                 }
  79
  80
  81             }
  82             return true;
  83             }
  84         };
  85
  86         ListenableFutureTask<Boolean>
  87             future = ListenableFutureTask.create(call);
  88
  89         executorService.submit(future);
  90
  91         return future;
  92     }
  93
  94     @Override public ListenableFuture<Void> preCommit() {
  95         return voidOperation(new PreCommitTransaction(), PreCommitTransactionReply.class);
  96     }
  97
  98     @Override public ListenableFuture<Void> abort() {
  99         return voidOperation(new AbortTransaction(), AbortTransactionReply.class);
 100     }
 101
 102     @Override public ListenableFuture<Void> commit() {
 103         return voidOperation(new CommitTransaction(), CommitTransactionReply.class);
 104     }
 105
 106     private ListenableFuture<Void> voidOperation(final Object message, final Class expectedResponseClass){
 107         Callable<Void> call = new Callable<Void>() {
 108
 109             @Override public Void call() throws Exception {
 110                 for(ActorPath actorPath : cohortPaths){
 111                     ActorSelection cohort = actorContext.actorSelection(actorPath);
 112
 113                     try {
 114                         Object response =
 115                             actorContext.executeRemoteOperation(cohort,
 116                                 message,
 117                                 ActorContext.ASK_DURATION);
 118
 119                         if (response != null && !response.getClass()
 120                             .equals(expectedResponseClass)) {
 121                             throw new RuntimeException(
 122                                 String.format(
 123                                     "did not get the expected response \n\t\t expected : %s \n\t\t actual   : %s",
 124                                     expectedResponseClass.toString(),
 125                                     response.getClass().toString())
 126                             );
 127                         }
 128                     } catch(TimeoutException e){
 129                         LOG.error(String.format("A timeout occurred when processing operation : %s", message));
 130                     }
 131                 }
 132                 return null;
 133             }
 134         };
 135
 136         ListenableFutureTask<Void>
 137             future = ListenableFutureTask.create(call);
 138
 139         executorService.submit(future);
 140
 141         return future;
 142
 143     }
 144
 145     public List<ActorPath> getCohortPaths() {
 146         return Collections.unmodifiableList(this.cohortPaths);
 147     }
 148 }