Raft Notary: remove snapshotting

node/src/main/kotlin/net/corda/node/services/transactions/DistributedImmutableMap.kt

@@ -19,7 +19,7 @@ import java.util.LinkedHashMap
  * 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.
  */
-class DistributedImmutableMap<K : Any, V : Any, E, EK>(val db: CordaPersistence, createMap: () -> AppendOnlyPersistentMap<K, V, E, EK>) : StateMachine(), Snapshottable {
+class DistributedImmutableMap<K : Any, V : Any, E, EK>(val db: CordaPersistence, createMap: () -> AppendOnlyPersistentMap<K, V, E, EK>) : StateMachine() {
     companion object {
         private val log = loggerFor<DistributedImmutableMap<*, *, *, *>>()
     }
@@ -70,29 +70,4 @@ class DistributedImmutableMap<K : Any, V : Any, E, EK>(val db: CordaPersistence,
             return db.transaction { map.size }
         }
     }
-
-    /**
-     * Writes 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.
-     */
-    override fun snapshot(writer: SnapshotWriter) {
-        db.transaction {
-            writer.writeInt(map.size)
-            map.allPersisted().forEach { writer.writeObject(it.first to it.second) }
-        }
-    }
-
-    /** Reads entries from disk and adds them to [map]. */
-    override fun install(reader: SnapshotReader) {
-        val size = reader.readInt()
-        db.transaction {
-            map.clear()
-            // TODO: read & put entries in batches
-            for (i in 1..size) {
-                val (key, value) = reader.readObject<Pair<K, V>>()
-                map[key] = value
-            }
-        }
-    }
 }