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
  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     private final ExecutorService executor;
  46     private final String transactionId;
  47
  48
  49     public ThreePhaseCommitCohortProxy(ActorContext actorContext,
  50         List<ActorPath> cohortPaths,
  51         String transactionId,
  52         ExecutorService executor) {
  53
  54         this.actorContext = actorContext;
  55         this.cohortPaths = cohortPaths;
  56         this.transactionId = transactionId;
  57         this.executor = executor;
  58     }
  59
  60     @Override public ListenableFuture<Boolean> canCommit() {
  61         Callable<Boolean> call = new Callable() {
  62
  63             @Override public Boolean call() throws Exception {
  64             for(ActorPath actorPath : cohortPaths){
  65                 ActorSelection cohort = actorContext.actorSelection(actorPath);
  66
  67                 try {
  68                     Object response =
  69                         actorContext.executeRemoteOperation(cohort,
  70                             new CanCommitTransaction().toSerializable(),
  71                             ActorContext.ASK_DURATION);
  72
  73                     if (response.getClass().equals(CanCommitTransactionReply.SERIALIZABLE_CLASS)) {
  74                         CanCommitTransactionReply reply =
  75                             CanCommitTransactionReply.fromSerializable(response);
  76                         if (!reply.getCanCommit()) {
  77                             return false;
  78                         }
  79                     }
  80                 } catch(RuntimeException e){
  81                     LOG.error("Unexpected Exception", e);
  82                     return false;
  83                 }
  84
  85
  86             }
  87             return true;
  88             }
  89         };
  90
  91         ListenableFutureTask<Boolean>
  92             future = ListenableFutureTask.create(call);
  93
  94         executor.submit(future);
  95
  96         return future;
  97     }
  98
  99     @Override public ListenableFuture<Void> preCommit() {
 100         return voidOperation(new PreCommitTransaction().toSerializable(), PreCommitTransactionReply.SERIALIZABLE_CLASS);
 101     }
 102
 103     @Override public ListenableFuture<Void> abort() {
 104         return voidOperation(new AbortTransaction().toSerializable(), AbortTransactionReply.SERIALIZABLE_CLASS);
 105     }
 106
 107     @Override public ListenableFuture<Void> commit() {
 108         return voidOperation(new CommitTransaction().toSerializable(), CommitTransactionReply.SERIALIZABLE_CLASS);
 109     }
 110
 111     private ListenableFuture<Void> voidOperation(final Object message, final Class expectedResponseClass){
 112         Callable<Void> call = new Callable<Void>() {
 113
 114             @Override public Void call() throws Exception {
 115                 for(ActorPath actorPath : cohortPaths){
 116                     ActorSelection cohort = actorContext.actorSelection(actorPath);
 117
 118                     try {
 119                         Object response =
 120                             actorContext.executeRemoteOperation(cohort,
 121                                 message,
 122                                 ActorContext.ASK_DURATION);
 123
 124                         if (response != null && !response.getClass()
 125                             .equals(expectedResponseClass)) {
 126                             throw new RuntimeException(
 127                                 String.format(
 128                                     "did not get the expected response \n\t\t expected : %s \n\t\t actual   : %s",
 129                                     expectedResponseClass.toString(),
 130                                     response.getClass().toString())
 131                             );
 132                         }
 133                     } catch(TimeoutException e){
 134                         LOG.error(String.format("A timeout occurred when processing operation : %s", message));
 135                     }
 136                 }
 137                 return null;
 138             }
 139         };
 140
 141         ListenableFutureTask<Void>
 142             future = ListenableFutureTask.create(call);
 143
 144         executor.submit(future);
 145
 146         return future;
 147
 148     }
 149
 150     public List<ActorPath> getCohortPaths() {
 151         return Collections.unmodifiableList(this.cohortPaths);
 152     }
 153 }