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Diffstat (limited to '')
-rw-r--r-- | wsrep-lib/dbsim/db_storage_engine.cpp | 119 |
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()); + } +} |