1 files changed, 119 insertions, 0 deletions
diff --git a/wsrep-lib/dbsim/db_storage_engine.cpp b/wsrep-lib/dbsim/db_storage_engine.cpp
new file mode 100644
index 00000000..c102783a
--- /dev/null
+++ b/wsrep-lib/dbsim/db_storage_engine.cpp
@@ -0,0 +1,119 @@
+/*
+ * Copyright (C) 2018 Codership Oy <info@codership.com>
+ *
+ * This file is part of wsrep-lib.
+ *
+ * Wsrep-lib is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Wsrep-lib is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with wsrep-lib.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "db_storage_engine.hpp"
+#include "db_client.hpp"
+
+void db::storage_engine::transaction::start(db::client* cc)
+{
+    wsrep::unique_lock<wsrep::mutex> lock(se_.mutex_);
+    if (se_.transactions_.insert(cc).second == false)
+    {
+        ::abort();
+    }
+    cc_ = cc;
+}
+
+void db::storage_engine::transaction::apply(
+    const wsrep::transaction& transaction)
+{
+    assert(cc_);
+    se_.bf_abort_some(transaction);
+}
+
+void db::storage_engine::transaction::commit(const wsrep::gtid& gtid)
+{
+    if (cc_)
+    {
+        wsrep::unique_lock<wsrep::mutex> lock(se_.mutex_);
+        se_.transactions_.erase(cc_);
+        se_.store_position(gtid);
+    }
+    cc_ = nullptr;
+}
+
+
+void db::storage_engine::transaction::rollback()
+{
+    if (cc_)
+    {
+        wsrep::unique_lock<wsrep::mutex> lock(se_.mutex_);
+        se_.transactions_.erase(cc_);
+    }
+    cc_ = nullptr;
+}
+
+void db::storage_engine::bf_abort_some(const wsrep::transaction& txc)
+{
+    std::uniform_int_distribution<size_t> uniform_dist(0, alg_freq_);
+    wsrep::unique_lock<wsrep::mutex> lock(mutex_);
+    if (alg_freq_ && uniform_dist(random_engine_) == 0)
+    {
+        if (transactions_.empty() == false)
+        {
+            for (auto victim : transactions_)
+            {
+                wsrep::client_state& cc(victim->client_state());
+                if (cc.mode() == wsrep::client_state::m_local)
+                {
+                    if (victim->bf_abort(txc.seqno()))
+                    {
+                        ++bf_aborts_;
+                    }
+                    break;
+                }
+            }
+        }
+    }
+}
+
+void db::storage_engine::store_position(const wsrep::gtid& gtid)
+{
+    validate_position(gtid);
+    position_ = gtid;
+}
+
+wsrep::gtid db::storage_engine::get_position() const
+{
+    return position_;
+}
+
+void db::storage_engine::store_view(const wsrep::view& view)
+{
+    view_ = view;
+}
+
+wsrep::view db::storage_engine::get_view() const
+{
+    return view_;
+}
+
+void db::storage_engine::validate_position(const wsrep::gtid& gtid) const
+{
+    using std::rel_ops::operator<=;
+    if (position_.id() == gtid.id() && gtid.seqno() <= position_.seqno())
+    {
+        std::ostringstream os;
+        os << "Invalid position submitted, position seqno "
+           << position_.seqno()
+           << " is greater than submitted seqno "
+           << gtid.seqno();
+        throw wsrep::runtime_error(os.str());
+    }
+}