Refactoring dbms simulator. Intermediate commit.

dbsim/db_storage_engine.hpp

@@ -0,0 +1,60 @@
+//
+// Copyright (C) 2018 Codership Oy <info@codership.com>
+//
+
+#ifndef WSREP_DB_STORAGE_ENGINE_HPP
+#define WSREP_DB_STORAGE_ENGINE_HPP
+
+#include "db_params.hpp"
+
+#include "wsrep/mutex.hpp"
+#include "wsrep/client_context.hpp"
+
+#include <atomic>
+#include <unordered_set>
+
+namespace db
+{
+    class client;
+    class storage_engine
+    {
+    public:
+        storage_engine(const params& params)
+            : mutex_()
+            , transactions_()
+            , alg_freq_(params.alg_freq)
+            , bf_aborts_()
+        { }
+
+        class transaction
+        {
+        public:
+            transaction(storage_engine& se)
+                : se_(se)
+                , cc_()
+            { }
+            ~transaction()
+            {
+                rollback();
+            }
+            bool active() const { return cc_ != nullptr; }
+            void start(client* cc);
+            void commit();
+            void rollback();
+            transaction(const transaction&) = delete;
+            transaction& operator=(const transaction&) = delete;
+        private:
+            storage_engine& se_;
+            client* cc_;
+        };
+        void bf_abort_some(const wsrep::transaction_context& tc);
+        long long bf_aborts() const { return bf_aborts_; }
+    private:
+        wsrep::default_mutex mutex_;
+        std::unordered_set<db::client*> transactions_;
+        size_t alg_freq_;
+        std::atomic<long long> bf_aborts_;
+    };
+}
+
+#endif // WSREP_DB_STORAGE_ENGINE_HPP