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