opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/shardmanager/ShardManagerGetSnapshotReplyActor.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.shardmanager;
   9
  10 import akka.actor.ActorRef;
  11 import akka.actor.PoisonPill;
  12 import akka.actor.Props;
  13 import akka.actor.ReceiveTimeout;
  14 import akka.actor.Status.Failure;
  15 import akka.actor.UntypedActor;
  16 import java.util.ArrayList;
  17 import java.util.Collection;
  18 import java.util.HashSet;
  19 import java.util.List;
  20 import java.util.Set;
  21 import java.util.concurrent.TimeoutException;
  22 import org.opendaylight.controller.cluster.datastore.identifiers.ShardIdentifier;
  23 import org.opendaylight.controller.cluster.datastore.persisted.DatastoreSnapshot;
  24 import org.opendaylight.controller.cluster.datastore.persisted.DatastoreSnapshot.ShardSnapshot;
  25 import org.opendaylight.controller.cluster.datastore.persisted.ShardManagerSnapshot;
  26 import org.opendaylight.controller.cluster.raft.client.messages.GetSnapshotReply;
  27 import org.slf4j.Logger;
  28 import org.slf4j.LoggerFactory;
  29 import scala.concurrent.duration.Duration;
  30
  31 /**
  32  * Temporary actor used by the ShardManager to compile GetSnapshot replies from the Shard actors and return
  33  * a DatastoreSnapshot instance reply.
  34  *
  35  * @author Thomas Pantelis
  36  */
  37 class ShardManagerGetSnapshotReplyActor extends UntypedActor {
  38     private static final Logger LOG = LoggerFactory.getLogger(ShardManagerGetSnapshotReplyActor.class);
  39
  40     private final Set<String> remainingShardNames;
  41     private final Params params;
  42     private final List<ShardSnapshot> shardSnapshots = new ArrayList<>();
  43
  44     private ShardManagerGetSnapshotReplyActor(Params params) {
  45         this.params = params;
  46         remainingShardNames = new HashSet<>(params.shardNames);
  47
  48         LOG.debug("{}: Expecting {} shard snapshot replies", params.id, params.shardNames.size());
  49
  50         getContext().setReceiveTimeout(params.receiveTimeout);
  51     }
  52
  53     @Override
  54     public void onReceive(Object message) {
  55         if (message instanceof GetSnapshotReply) {
  56             onGetSnapshotReply((GetSnapshotReply)message);
  57         } else if (message instanceof Failure) {
  58             LOG.debug("{}: Received {}", params.id, message);
  59
  60             params.replyToActor.tell(message, getSelf());
  61             getSelf().tell(PoisonPill.getInstance(), getSelf());
  62         } else if (message instanceof ReceiveTimeout) {
  63             String msg = String.format(
  64                     "Timed out after %s ms while waiting for snapshot replies from %d shard(s). %d shard(s) %s "
  65                     + "did not respond.", params.receiveTimeout.toMillis(), params.shardNames.size(),
  66                     remainingShardNames.size(), remainingShardNames);
  67             LOG.warn("{}: {}", params.id, msg);
  68             params.replyToActor.tell(new Failure(new TimeoutException(msg)), getSelf());
  69             getSelf().tell(PoisonPill.getInstance(), getSelf());
  70         }
  71     }
  72
  73     private void onGetSnapshotReply(GetSnapshotReply getSnapshotReply) {
  74         LOG.debug("{}: Received {}", params.id, getSnapshotReply);
  75
  76         ShardIdentifier shardId = ShardIdentifier.fromShardIdString(getSnapshotReply.getId());
  77         shardSnapshots.add(new ShardSnapshot(shardId.getShardName(), getSnapshotReply.getSnapshot()));
  78
  79         remainingShardNames.remove(shardId.getShardName());
  80         if (remainingShardNames.isEmpty()) {
  81             LOG.debug("{}: All shard snapshots received", params.id);
  82
  83             DatastoreSnapshot datastoreSnapshot = new DatastoreSnapshot(params.datastoreType,
  84                     params.shardManagerSnapshot, shardSnapshots);
  85             params.replyToActor.tell(datastoreSnapshot, getSelf());
  86             getSelf().tell(PoisonPill.getInstance(), getSelf());
  87         }
  88     }
  89
  90     public static Props props(Collection<String> shardNames, String datastoreType,
  91             ShardManagerSnapshot shardManagerSnapshot, ActorRef replyToActor, String id, Duration receiveTimeout) {
  92         return Props.create(ShardManagerGetSnapshotReplyActor.class, new Params(shardNames, datastoreType,
  93                 shardManagerSnapshot, replyToActor, id, receiveTimeout));
  94     }
  95
  96     private static final class Params {
  97         final Collection<String> shardNames;
  98         final String datastoreType;
  99         final ShardManagerSnapshot shardManagerSnapshot;
 100         final ActorRef replyToActor;
 101         final String id;
 102         final Duration receiveTimeout;
 103
 104         Params(Collection<String> shardNames, String datastoreType, ShardManagerSnapshot shardManagerSnapshot,
 105                 ActorRef replyToActor, String id, Duration receiveTimeout) {
 106             this.shardNames = shardNames;
 107             this.datastoreType = datastoreType;
 108             this.shardManagerSnapshot = shardManagerSnapshot;
 109             this.replyToActor = replyToActor;
 110             this.id = id;
 111             this.receiveTimeout = receiveTimeout;
 112         }
 113     }
 114 }