opendaylight/md-sal/cds-access-client/src/main/java/org/opendaylight/controller/cluster/access/client/RecoveringClientActorBehavior.java

   1 /*
   2  * Copyright (c) 2016 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 package org.opendaylight.controller.cluster.access.client;
   9
  10 import akka.persistence.RecoveryCompleted;
  11 import akka.persistence.SnapshotOffer;
  12 import com.google.common.base.Preconditions;
  13 import org.opendaylight.controller.cluster.access.concepts.ClientIdentifier;
  14 import org.opendaylight.controller.cluster.access.concepts.FrontendIdentifier;
  15 import org.slf4j.Logger;
  16 import org.slf4j.LoggerFactory;
  17
  18 /**
  19  * Transient behavior handling messages during initial actor recovery.
  20  *
  21  * @author Robert Varga
  22  */
  23 final class RecoveringClientActorBehavior extends AbstractClientActorBehavior<InitialClientActorContext> {
  24     private static final Logger LOG = LoggerFactory.getLogger(RecoveringClientActorBehavior.class);
  25     private final FrontendIdentifier currentFrontend;
  26     private ClientIdentifier lastId = null;
  27
  28     RecoveringClientActorBehavior(final InitialClientActorContext context, final FrontendIdentifier frontendId) {
  29         super(context);
  30         currentFrontend = Preconditions.checkNotNull(frontendId);
  31     }
  32
  33     @Override
  34     AbstractClientActorBehavior<?> onReceiveCommand(final Object command) {
  35         throw new IllegalStateException("Frontend is recovering");
  36     }
  37
  38     @Override
  39     AbstractClientActorBehavior<?> onReceiveRecover(final Object recover) {
  40         if (recover instanceof RecoveryCompleted) {
  41             final ClientIdentifier nextId;
  42             if (lastId != null) {
  43                 if (!currentFrontend.equals(lastId.getFrontendId())) {
  44                     LOG.error("{}: Mismatched frontend identifier, shutting down. Current: {} Saved: {}",
  45                         persistenceId(), currentFrontend, lastId.getFrontendId());
  46                     return null;
  47                 }
  48
  49                 nextId = ClientIdentifier.create(currentFrontend, lastId.getGeneration() + 1);
  50             } else {
  51                 nextId = ClientIdentifier.create(currentFrontend, 0);
  52             }
  53
  54             LOG.debug("{}: persisting new identifier {}", persistenceId(), nextId);
  55             context().saveSnapshot(nextId);
  56             return new SavingClientActorBehavior(context(), nextId);
  57         } else if (recover instanceof SnapshotOffer) {
  58             lastId = (ClientIdentifier) ((SnapshotOffer)recover).snapshot();
  59             LOG.debug("{}: recovered identifier {}", persistenceId(), lastId);
  60         } else {
  61             LOG.warn("{}: ignoring recovery message {}", persistenceId(), recover);
  62         }
  63
  64         return this;
  65     }
  66 }