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/**
* Copyright (C) 2022-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/db/repl/split_prepare_session_manager.h"
namespace mongo {
namespace repl {
SplitPrepareSessionManager::SplitPrepareSessionManager(InternalSessionPool* sessionPool)
: _sessionPool(sessionPool) {}
const std::vector<PooledSession>& SplitPrepareSessionManager::splitSession(
const LogicalSessionId& sessionId, TxnNumber txnNumber, uint32_t numSplits) {
invariant(numSplits > 0);
stdx::lock_guard<Latch> lk(_mutex);
auto [it, succ] =
_splitSessionMap.try_emplace(sessionId, txnNumber, std::vector<PooledSession>());
// The session must not be split before.
invariant(succ);
auto& sessions = it->second.second;
sessions.reserve(numSplits);
for (uint32_t i = 0; i < numSplits; ++i) {
sessions.push_back(_sessionPool->acquireSystemSession());
}
return sessions;
}
boost::optional<const std::vector<PooledSession>&> SplitPrepareSessionManager::getSplitSessions(
const LogicalSessionId& sessionId, TxnNumber txnNumber) const {
stdx::lock_guard<Latch> lk(_mutex);
auto it = _splitSessionMap.find(sessionId);
if (it == _splitSessionMap.end()) {
return boost::none;
}
// The txnNumber must not change after the session was split.
invariant(txnNumber == it->second.first);
return it->second.second;
}
bool SplitPrepareSessionManager::isSessionSplit(const LogicalSessionId& sessionId,
TxnNumber txnNumber) const {
stdx::lock_guard<Latch> lk(_mutex);
auto it = _splitSessionMap.find(sessionId);
if (it == _splitSessionMap.end()) {
return false;
}
// The txnNumber must not change after the session was split.
invariant(txnNumber == it->second.first);
return true;
}
void SplitPrepareSessionManager::releaseSplitSessions(const LogicalSessionId& sessionId,
TxnNumber txnNumber) {
stdx::lock_guard<Latch> lk(_mutex);
auto it = _splitSessionMap.find(sessionId);
// The session must already be split and tracked.
invariant(it != _splitSessionMap.end());
// The txnNumber must not change after the session was split.
invariant(txnNumber == it->second.first);
auto& sessions = it->second.second;
for (const auto& sess : sessions) {
_sessionPool->release(sess);
}
_splitSessionMap.erase(it);
}
} // namespace repl
} // namespace mongo
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