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/**
* Copyright (C) 2019-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 <algorithm>
#include "mongo/db/storage/biggie/biggie_record_store.h"
#include "mongo/db/storage/biggie/biggie_visibility_manager.h"
#include "mongo/db/storage/recovery_unit.h"
namespace mongo {
namespace biggie {
/**
* Used by the visibility manager to register changes when the RecoveryUnit either commits or
* rolls back changes.
*/
class VisibilityManagerChange : public RecoveryUnit::Change {
public:
VisibilityManagerChange(VisibilityManager* visibilityManager, RecordStore* rs, RecordId rid)
: _visibilityManager(visibilityManager), _rs(rs), _rid(rid) {}
~VisibilityManagerChange() = default;
virtual void commit(boost::optional<Timestamp>) {
_visibilityManager->dealtWithRecord(_rid);
}
virtual void rollback() {
_visibilityManager->dealtWithRecord(_rid);
stdx::lock_guard<stdx::mutex> lk(_rs->_cappedCallbackMutex);
if (_rs->_cappedCallback)
_rs->_cappedCallback->notifyCappedWaitersIfNeeded();
}
private:
VisibilityManager* _visibilityManager;
const RecordStore* const _rs;
const RecordId _rid;
};
void VisibilityManager::dealtWithRecord(RecordId rid) {
stdx::lock_guard<stdx::mutex> lock(_stateLock);
_uncommittedRecords.erase(rid);
_opsBecameVisibleCV.notify_all();
}
void VisibilityManager::addUncommittedRecord(OperationContext* opCtx,
RecordStore* rs,
RecordId rid) {
stdx::lock_guard<stdx::mutex> lock(_stateLock);
_uncommittedRecords.insert(rid);
opCtx->recoveryUnit()->registerChange(new VisibilityManagerChange(this, rs, rid));
if (rid > _highestSeen)
_highestSeen = rid;
}
RecordId VisibilityManager::getAllCommittedRecord() {
stdx::lock_guard<stdx::mutex> lock(_stateLock);
return _uncommittedRecords.empty() ? _highestSeen
: RecordId(_uncommittedRecords.begin()->repr() - 1);
}
bool VisibilityManager::isFirstHidden(RecordId rid) {
stdx::lock_guard<stdx::mutex> lock(_stateLock);
if (_uncommittedRecords.empty())
return false;
return *_uncommittedRecords.begin() == rid;
}
void VisibilityManager::waitForAllEarlierOplogWritesToBeVisible(OperationContext* opCtx) {
invariant(opCtx->lockState()->isNoop() || !opCtx->lockState()->inAWriteUnitOfWork());
stdx::unique_lock<stdx::mutex> lock(_stateLock);
const RecordId waitFor = _highestSeen;
opCtx->waitForConditionOrInterrupt(_opsBecameVisibleCV, lock, [&] {
return _uncommittedRecords.empty() || *_uncommittedRecords.begin() > waitFor;
});
}
} // namespace biggie
} // namespace mongo
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