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