opendaylight/md-sal/cds-access-client/src/main/java/org/opendaylight/controller/cluster/access/client/SavingClientActorBehavior.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.DeleteSnapshotsFailure;
  13 import akka.persistence.DeleteSnapshotsSuccess;
  14 import akka.persistence.SaveSnapshotFailure;
  15 import akka.persistence.SaveSnapshotSuccess;
  16 import akka.persistence.SnapshotSelectionCriteria;
  17 import org.opendaylight.controller.cluster.access.concepts.ClientIdentifier;
  18 import org.slf4j.Logger;
  19 import org.slf4j.LoggerFactory;
  20
  21 /**
  22  * Transient behavior handling messages while the new generation is being persisted.
  23  *
  24  * @author Robert Varga
  25  */
  26 final class SavingClientActorBehavior extends RecoveredClientActorBehavior<InitialClientActorContext> {
  27     private static final Logger LOG = LoggerFactory.getLogger(SavingClientActorBehavior.class);
  28     private final ClientIdentifier myId;
  29
  30     SavingClientActorBehavior(final InitialClientActorContext context, final ClientIdentifier nextId) {
  31         super(context);
  32         this.myId = requireNonNull(nextId);
  33     }
  34
  35     @Override
  36     AbstractClientActorBehavior<?> onReceiveCommand(final Object command) {
  37         if (command instanceof SaveSnapshotFailure) {
  38             LOG.error("{}: failed to persist state", persistenceId(), ((SaveSnapshotFailure) command).cause());
  39             return null;
  40         } else if (command instanceof SaveSnapshotSuccess) {
  41             LOG.debug("{}: got command: {}", persistenceId(), command);
  42             SaveSnapshotSuccess saved = (SaveSnapshotSuccess)command;
  43             context().deleteSnapshots(new SnapshotSelectionCriteria(scala.Long.MaxValue(),
  44                     saved.metadata().timestamp() - 1, 0L, 0L));
  45             return this;
  46         } else if (command instanceof DeleteSnapshotsSuccess) {
  47             LOG.debug("{}: got command: {}", persistenceId(), command);
  48         } else if (command instanceof DeleteSnapshotsFailure) {
  49             // Not treating this as a fatal error.
  50             LOG.warn("{}: failed to delete prior snapshots", persistenceId(),
  51                     ((DeleteSnapshotsFailure) command).cause());
  52         } else {
  53             LOG.debug("{}: stashing command {}", persistenceId(), command);
  54             context().stash();
  55             return this;
  56         }
  57
  58         context().unstash();
  59         return context().createBehavior(myId);
  60     }
  61 }