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 static java.util.Objects.requireNonNull;
  11
  12 import akka.persistence.RecoveryCompleted;
  13 import akka.persistence.SnapshotOffer;
  14 import org.opendaylight.controller.cluster.access.concepts.ClientIdentifier;
  15 import org.opendaylight.controller.cluster.access.concepts.FrontendIdentifier;
  16 import org.slf4j.Logger;
  17 import org.slf4j.LoggerFactory;
  18
  19 /**
  20  * Transient behavior handling messages during initial actor recovery.
  21  *
  22  * @author Robert Varga
  23  */
  24 final class RecoveringClientActorBehavior extends AbstractClientActorBehavior<InitialClientActorContext> {
  25     private static final Logger LOG = LoggerFactory.getLogger(RecoveringClientActorBehavior.class);
  26     private final FrontendIdentifier currentFrontend;
  27     private ClientIdentifier lastId = null;
  28
  29     RecoveringClientActorBehavior(final InitialClientActorContext context, final FrontendIdentifier frontendId) {
  30         super(context);
  31         currentFrontend = requireNonNull(frontendId);
  32     }
  33
  34     @Override
  35     AbstractClientActorBehavior<?> onReceiveCommand(final Object command) {
  36         throw new IllegalStateException("Frontend is recovering");
  37     }
  38
  39     @Override
  40     AbstractClientActorBehavior<?> onReceiveRecover(final Object recover) {
  41         if (recover instanceof RecoveryCompleted) {
  42             final ClientIdentifier nextId;
  43             if (lastId != null) {
  44                 if (!currentFrontend.equals(lastId.getFrontendId())) {
  45                     LOG.error("{}: Mismatched frontend identifier, shutting down. Current: {} Saved: {}",
  46                         persistenceId(), currentFrontend, lastId.getFrontendId());
  47                     return null;
  48                 }
  49
  50                 nextId = ClientIdentifier.create(currentFrontend, lastId.getGeneration() + 1);
  51             } else {
  52                 nextId = ClientIdentifier.create(currentFrontend, 0);
  53             }
  54
  55             LOG.debug("{}: persisting new identifier {}", persistenceId(), nextId);
  56             context().saveSnapshot(nextId);
  57             return new SavingClientActorBehavior(context(), nextId);
  58         } else if (recover instanceof SnapshotOffer) {
  59             lastId = (ClientIdentifier) ((SnapshotOffer)recover).snapshot();
  60             LOG.debug("{}: recovered identifier {}", persistenceId(), lastId);
  61         } else {
  62             LOG.warn("{}: ignoring recovery message {}", persistenceId(), recover);
  63         }
  64
  65         return this;
  66     }
  67 }