opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/entityownership/DistributedEntityOwnershipService.java

   1 /*
   2  * Copyright (c) 2015 Brocade Communications 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 package org.opendaylight.controller.cluster.datastore.entityownership;
   9
  10 import akka.actor.ActorRef;
  11 import akka.dispatch.OnComplete;
  12 import akka.util.Timeout;
  13 import java.util.concurrent.ConcurrentHashMap;
  14 import java.util.concurrent.ConcurrentMap;
  15 import java.util.concurrent.TimeUnit;
  16 import org.opendaylight.controller.cluster.datastore.DistributedDataStore;
  17 import org.opendaylight.controller.cluster.datastore.entityownership.messages.RegisterCandidateLocal;
  18 import org.opendaylight.controller.cluster.datastore.entityownership.messages.UnregisterCandidateLocal;
  19 import org.opendaylight.controller.cluster.datastore.messages.CreateShard;
  20 import org.opendaylight.controller.md.sal.common.api.clustering.CandidateAlreadyRegisteredException;
  21 import org.opendaylight.controller.md.sal.common.api.clustering.Entity;
  22 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipCandidate;
  23 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipCandidateRegistration;
  24 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipListener;
  25 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipListenerRegistration;
  26 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipService;
  27 import org.slf4j.Logger;
  28 import org.slf4j.LoggerFactory;
  29 import scala.concurrent.Future;
  30
  31 /**
  32  * The distributed implementation of the EntityOwnershipService.
  33  *
  34  * @author Thomas Pantelis
  35  */
  36 public class DistributedEntityOwnershipService implements EntityOwnershipService, AutoCloseable {
  37     private static final Logger LOG = LoggerFactory.getLogger(DistributedEntityOwnershipService.class);
  38     static final String ENTITY_OWNERSHIP_SHARD_NAME = "entity-ownership";
  39     private static final Timeout MESSAGE_TIMEOUT = new Timeout(1, TimeUnit.MINUTES);
  40
  41     private final DistributedDataStore datastore;
  42     private final ConcurrentMap<Entity, EntityOwnershipCandidate> registeredEntities = new ConcurrentHashMap<>();
  43     private volatile ActorRef localEntityOwnershipShard;
  44
  45     public DistributedEntityOwnershipService(DistributedDataStore datastore) {
  46         this.datastore = datastore;
  47     }
  48
  49     public void start() {
  50         ActorRef shardManagerActor = datastore.getActorContext().getShardManager();
  51
  52         CreateShard createShard = new CreateShard(ENTITY_OWNERSHIP_SHARD_NAME,
  53                 datastore.getActorContext().getConfiguration().getUniqueMemberNamesForAllShards(),
  54                 newShardPropsCreator(), null);
  55
  56         Future<Object> createFuture = datastore.getActorContext().executeOperationAsync(shardManagerActor,
  57                 createShard, MESSAGE_TIMEOUT);
  58
  59         createFuture.onComplete(new OnComplete<Object>() {
  60             @Override
  61             public void onComplete(Throwable failure, Object response) {
  62                 if(failure != null) {
  63                     LOG.error("Failed to create {} shard", ENTITY_OWNERSHIP_SHARD_NAME);
  64                 } else {
  65                     LOG.info("Successfully created {} shard", ENTITY_OWNERSHIP_SHARD_NAME);
  66                 }
  67             }
  68         }, datastore.getActorContext().getClientDispatcher());
  69     }
  70
  71     private void executeEntityOwnershipShardOperation(final ActorRef shardActor, final Object message) {
  72         Future<Object> future = datastore.getActorContext().executeOperationAsync(shardActor, message, MESSAGE_TIMEOUT);
  73         future.onComplete(new OnComplete<Object>() {
  74             @Override
  75             public void onComplete(Throwable failure, Object response) {
  76                 if(failure != null) {
  77                     LOG.debug("Error sending message {} to {}", message, shardActor, failure);
  78                     // TODO - queue for retry
  79                 } else {
  80                     LOG.debug("{} message to {} succeeded", message, shardActor, failure);
  81                 }
  82             }
  83         }, datastore.getActorContext().getClientDispatcher());
  84     }
  85
  86     private void executeLocalEntityOwnershipShardOperation(final Object message) {
  87         if(localEntityOwnershipShard == null) {
  88             Future<ActorRef> future = datastore.getActorContext().findLocalShardAsync(ENTITY_OWNERSHIP_SHARD_NAME);
  89             future.onComplete(new OnComplete<ActorRef>() {
  90                 @Override
  91                 public void onComplete(Throwable failure, ActorRef shardActor) {
  92                     if(failure != null) {
  93                         LOG.error("Failed to find local {} shard", ENTITY_OWNERSHIP_SHARD_NAME, failure);
  94                     } else {
  95                         localEntityOwnershipShard = shardActor;
  96                         executeEntityOwnershipShardOperation(localEntityOwnershipShard, message);
  97                     }
  98                 }
  99             }, datastore.getActorContext().getClientDispatcher());
 100
 101         } else {
 102             executeEntityOwnershipShardOperation(localEntityOwnershipShard, message);
 103         }
 104     }
 105
 106     @Override
 107     public EntityOwnershipCandidateRegistration registerCandidate(Entity entity, EntityOwnershipCandidate candidate)
 108             throws CandidateAlreadyRegisteredException {
 109
 110         EntityOwnershipCandidate currentCandidate = registeredEntities.putIfAbsent(entity, candidate);
 111         if(currentCandidate != null) {
 112             throw new CandidateAlreadyRegisteredException(entity, currentCandidate);
 113         }
 114
 115         RegisterCandidateLocal registerCandidate = new RegisterCandidateLocal(candidate, entity);
 116
 117         LOG.debug("Registering candidate with message: {}", registerCandidate);
 118
 119         executeLocalEntityOwnershipShardOperation(registerCandidate);
 120         return new DistributedEntityOwnershipCandidateRegistration(candidate, entity, this);
 121     }
 122
 123     void unregisterCandidate(Entity entity) {
 124         LOG.debug("Unregistering candidate for {}", entity);
 125
 126         executeLocalEntityOwnershipShardOperation(new UnregisterCandidateLocal(entity));
 127         registeredEntities.remove(entity);
 128     }
 129
 130     @Override
 131     public EntityOwnershipListenerRegistration registerListener(Entity entity, EntityOwnershipListener listener) {
 132         // TODO Auto-generated method stub
 133         return null;
 134     }
 135
 136     @Override
 137     public void close() {
 138     }
 139
 140     protected EntityOwnershipShardPropsCreator newShardPropsCreator() {
 141         return new EntityOwnershipShardPropsCreator();
 142     }
 143 }