class DistributedImmutableMap<K : Any, V : Any>A distributed map state machine that doesnt allow overriding values. The state machine is replicated across a Copycat Raft cluster.
The map contents are backed by a JDBC table. State re-synchronisation is achieved by periodically persisting snapshots to disk, and sharing them across the cluster. A new node joining the cluster will have to obtain and install a snapshot containing the entire JDBC table contents.
| Commands |
object Commands |
| <init> |
DistributedImmutableMap(db: <ERROR CLASS>, tableName: String)A distributed map state machine that doesnt allow overriding values. The state machine is replicated across a Copycat Raft cluster. |
| db |
val db: <ERROR CLASS> |
| get |
fun get(commit: <ERROR CLASS><Get<K, V>>): V?Gets a value for the given Commands.Get.key |
| install |
fun install(reader: <ERROR CLASS>): UnitReads entries from disk and adds them to map. |
| put |
fun put(commit: <ERROR CLASS><PutAll<K, V>>): Map<K, V>Stores the given Commands.PutAll.entries if no entry key already exists. |
| size |
fun size(commit: <ERROR CLASS><Size>): Int |
| snapshot |
fun snapshot(writer: <ERROR CLASS>): UnitWrites out all map entries to disk. Note that this operation does not load all entries into memory, as the SnapshotWriter is using a disk-backed buffer internally, and iterating map entries results in only a fixed number of recently accessed entries to ever be kept in memory. |