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// biggie_recovery_unit.cpp
/**
* Copyright (C) 2018-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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kStorage
#include "mongo/platform/basic.h"
#include <mutex>
#include "mongo/db/concurrency/write_conflict_exception.h"
#include "mongo/db/storage/biggie/biggie_recovery_unit.h"
#include "mongo/util/log.h"
namespace mongo {
namespace biggie {
RecoveryUnit::RecoveryUnit(KVEngine* parentKVEngine, stdx::function<void()> cb)
: _waitUntilDurableCallback(cb), _KVEngine(parentKVEngine) {}
void RecoveryUnit::beginUnitOfWork(OperationContext* opCtx) {}
void RecoveryUnit::commitUnitOfWork() {
if (_dirty && _workingCopy) {
while (true) {
std::shared_ptr<StringStore> master = _KVEngine->getMaster();
try {
_workingCopy->merge3(*_mergeBase, *master);
} catch (const merge_conflict_exception&) {
throw WriteConflictException();
}
if (_KVEngine->compareAndSwapMaster(master, _workingCopy)) {
// Merged successfully
_mergeBase.reset();
break;
} else {
// Retry the merge, but update the mergeBase since some progress was made merging.
_mergeBase = master;
}
}
_dirty = false;
}
try {
for (Changes::iterator it = _changes.begin(), end = _changes.end(); it != end; ++it) {
(*it)->commit(boost::none);
}
_changes.clear();
} catch (...) {
std::terminate();
}
}
void RecoveryUnit::abortUnitOfWork() {
_workingCopy.reset();
_mergeBase.reset();
try {
for (Changes::reverse_iterator it = _changes.rbegin(), end = _changes.rend(); it != end;
++it) {
ChangePtr change = *it;
LOG(2) << "CUSTOM ROLLBACK " << demangleName(typeid(*change));
change->rollback();
}
_changes.clear();
} catch (...) {
std::terminate();
}
}
bool RecoveryUnit::waitUntilDurable() {
return true; // This is an in-memory storage engine.
}
void RecoveryUnit::abandonSnapshot() {
_mergeBase.reset();
_workingCopy.reset();
_dirty = false;
}
void RecoveryUnit::registerChange(Change* change) {
_changes.push_back(ChangePtr(change));
}
SnapshotId RecoveryUnit::getSnapshotId() const {
return SnapshotId();
}
bool RecoveryUnit::forkIfNeeded() {
// _workingCopy and _mergeBase either both exist or both don't.
invariant((_workingCopy && _mergeBase) || (!_workingCopy && !_mergeBase));
if (_mergeBase) {
return false;
}
_mergeBase = _KVEngine->getMaster();
_workingCopy = std::make_unique<StringStore>(*_mergeBase);
return true;
}
void RecoveryUnit::setOrderedCommit(bool orderedCommit) {}
} // namespace biggie
} // namespace mongo
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