Check-in initial RsmEngine class

src/storage/v3/rsm_engine.hpp

@@ -0,0 +1,41 @@
+// Copyright 2022 Memgraph Ltd.
+//
+// Use of this software is governed by the Business Source License
+// included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
+// License, and you may not use this file except in compliance with the Business Source License.
+//
+// As of the Change Date specified in that file, in accordance with
+// the Business Source License, use of this software will be governed
+// by the Apache License, Version 2.0, included in the file
+// licenses/APL.txt.
+
+#pragma once
+
+#include <boost/uuid/uuid.hpp>
+#include "io/rsm/coordinator_rsm.hpp"
+#include "io/rsm/rsm_client.hpp"
+
+namespace memgraph::storage::v3 {
+
+using boost::uuids::uuid;
+using memgraph::coordinator;
+using memgraph::io::rsm::RsmClient;
+
+/// The RsmEngine is responsible for:
+/// * reconciling the storage engine's local configuration with the Coordinator's
+///   intentions for how it should participate in multiple raft clusters
+/// * replying to heartbeat requests to the Coordinator
+/// * routing incoming messages from the Io interface to the appropriate
+///   storage RSM
+///
+/// Every storage engine has exactly one RsmEngine.
+template <typename IoImpl>
+class RsmEngine {
+  Io<IoImpl> io_;
+  std::map<uuid, StorageRsm> rsm_map_;
+
+ public:
+  RsmEngine(Io<IoImpl> io) : io_(io) {}
+};
+
+}  // namespace memgraph::storage::v3