| package org.onlab.onos.store.flow; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| import java.util.Collection; |
| import java.util.Collections; |
| |
| import org.onlab.onos.cluster.NodeId; |
| |
| import com.google.common.base.Optional; |
| |
| /** |
| * Class to represent placement information about Master/Backup copy. |
| */ |
| public final class ReplicaInfo { |
| |
| private final Optional<NodeId> master; |
| private final Collection<NodeId> backups; |
| |
| /** |
| * Creates a ReplicaInfo instance. |
| * |
| * @param master NodeId of the node where the master copy should be |
| * @param backups collection of NodeId, where backup copies should be placed |
| */ |
| public ReplicaInfo(NodeId master, Collection<NodeId> backups) { |
| this.master = Optional.fromNullable(master); |
| this.backups = checkNotNull(backups); |
| } |
| |
| /** |
| * Returns the NodeId, if there is a Node where the master copy should be. |
| * |
| * @return NodeId, where the master copy should be placed |
| */ |
| public Optional<NodeId> master() { |
| return master; |
| } |
| |
| /** |
| * Returns the collection of NodeId, where backup copies should be placed. |
| * |
| * @return collection of NodeId, where backup copies should be placed |
| */ |
| public Collection<NodeId> backups() { |
| return backups; |
| } |
| |
| // for Serializer |
| private ReplicaInfo() { |
| this.master = Optional.absent(); |
| this.backups = Collections.emptyList(); |
| } |
| } |