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-rw-r--r--wsrep-lib/dbsim/db_storage_engine.cpp119
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
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+++ b/wsrep-lib/dbsim/db_storage_engine.cpp
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+/*
+ * 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());
+ }
+}