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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"
#include <cassert>
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
{
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());
}
}
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