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/**
* Copyright (C) 2018 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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/storage/write_unit_of_work.h"
#include "mongo/db/operation_context.h"
namespace mongo {
WriteUnitOfWork::WriteUnitOfWork(OperationContext* opCtx)
: _opCtx(opCtx), _toplevel(opCtx->_ruState == RecoveryUnitState::kNotInUnitOfWork) {
uassert(ErrorCodes::IllegalOperation,
"Cannot execute a write operation in read-only mode",
!storageGlobalParams.readOnly);
_opCtx->lockState()->beginWriteUnitOfWork();
if (_toplevel) {
_opCtx->recoveryUnit()->beginUnitOfWork(_opCtx);
_opCtx->_ruState = RecoveryUnitState::kActiveUnitOfWork;
}
}
WriteUnitOfWork::~WriteUnitOfWork() {
dassert(!storageGlobalParams.readOnly);
if (!_released && !_committed) {
invariant(_opCtx->_ruState != RecoveryUnitState::kNotInUnitOfWork);
if (_toplevel) {
_opCtx->recoveryUnit()->abortUnitOfWork();
_opCtx->_ruState = RecoveryUnitState::kNotInUnitOfWork;
} else {
_opCtx->_ruState = RecoveryUnitState::kFailedUnitOfWork;
}
_opCtx->lockState()->endWriteUnitOfWork();
}
}
std::unique_ptr<WriteUnitOfWork> WriteUnitOfWork::createForSnapshotResume(
OperationContext* opCtx, RecoveryUnitState ruState) {
auto wuow = std::unique_ptr<WriteUnitOfWork>(new WriteUnitOfWork());
wuow->_opCtx = opCtx;
wuow->_toplevel = true;
wuow->_opCtx->_ruState = ruState;
return wuow;
}
WriteUnitOfWork::RecoveryUnitState WriteUnitOfWork::release() {
auto ruState = _opCtx->_ruState;
invariant(ruState == RecoveryUnitState::kActiveUnitOfWork ||
ruState == RecoveryUnitState::kFailedUnitOfWork);
invariant(!_committed);
invariant(_toplevel);
_released = true;
_opCtx->_ruState = RecoveryUnitState::kNotInUnitOfWork;
return ruState;
}
void WriteUnitOfWork::prepare() {
invariant(!_committed);
invariant(!_prepared);
invariant(_toplevel);
invariant(_opCtx->_ruState == RecoveryUnitState::kActiveUnitOfWork);
_opCtx->recoveryUnit()->prepareUnitOfWork();
_prepared = true;
}
void WriteUnitOfWork::commit() {
invariant(!_committed);
invariant(!_released);
invariant(_opCtx->_ruState == RecoveryUnitState::kActiveUnitOfWork);
if (_toplevel) {
_opCtx->recoveryUnit()->commitUnitOfWork();
_opCtx->_ruState = RecoveryUnitState::kNotInUnitOfWork;
}
_opCtx->lockState()->endWriteUnitOfWork();
_committed = true;
}
std::ostream& operator<<(std::ostream& os, WriteUnitOfWork::RecoveryUnitState state) {
switch (state) {
case WriteUnitOfWork::kNotInUnitOfWork:
return os << "NotInUnitOfWork";
case WriteUnitOfWork::kActiveUnitOfWork:
return os << "ActiveUnitOfWork";
case WriteUnitOfWork::kFailedUnitOfWork:
return os << "FailedUnitOfWork";
}
MONGO_UNREACHABLE;
}
} // namespace mongo
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