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/**
* 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.
*/
#pragma once
#include <atomic>
#include <map>
#include "mongo/db/concurrency/d_concurrency.h"
#include "mongo/db/storage/biggie/biggie_visibility_manager.h"
#include "mongo/db/storage/biggie/store.h"
#include "mongo/db/storage/capped_callback.h"
#include "mongo/db/storage/record_store.h"
#include "mongo/platform/atomic_word.h"
#include "mongo/platform/mutex.h"
namespace mongo {
namespace biggie {
/**
* A RecordStore that stores all data in-memory.
*/
class RecordStore final : public ::mongo::RecordStore {
public:
explicit RecordStore(StringData ns,
StringData ident,
bool isCapped = false,
int64_t cappedMaxSize = -1,
int64_t cappedMaxDocs = -1,
CappedCallback* cappedCallback = nullptr,
VisibilityManager* visibilityManager = nullptr);
~RecordStore() = default;
virtual const char* name() const;
virtual const std::string& getIdent() const;
virtual long long dataSize(OperationContext* opCtx) const;
virtual long long numRecords(OperationContext* opCtx) const;
virtual bool isCapped() const;
virtual void setCappedCallback(CappedCallback*);
virtual int64_t storageSize(OperationContext* opCtx,
BSONObjBuilder* extraInfo = nullptr,
int infoLevel = 0) const;
virtual bool findRecord(OperationContext* opCtx, const RecordId& loc, RecordData* rd) const;
virtual void deleteRecord(OperationContext* opCtx, const RecordId& dl);
virtual Status insertRecords(OperationContext* opCtx,
std::vector<Record>* inOutRecords,
const std::vector<Timestamp>& timestamps);
virtual Status updateRecord(OperationContext* opCtx,
const RecordId& oldLocation,
const char* data,
int len);
virtual bool updateWithDamagesSupported() const;
virtual StatusWith<RecordData> updateWithDamages(OperationContext* opCtx,
const RecordId& loc,
const RecordData& oldRec,
const char* damageSource,
const mutablebson::DamageVector& damages);
std::unique_ptr<SeekableRecordCursor> getCursor(OperationContext* opCtx,
bool forward) const final;
virtual Status truncate(OperationContext* opCtx);
StatusWith<int64_t> truncateWithoutUpdatingCount(OperationContext* opCtx);
virtual void cappedTruncateAfter(OperationContext* opCtx, RecordId end, bool inclusive);
virtual void appendCustomStats(OperationContext* opCtx,
BSONObjBuilder* result,
double scale) const;
virtual Status touch(OperationContext* opCtx, BSONObjBuilder* output) const;
virtual boost::optional<RecordId> oplogStartHack(OperationContext* opCtx,
const RecordId& startingPosition) const;
void waitForAllEarlierOplogWritesToBeVisible(OperationContext* opCtx) const override;
virtual void updateStatsAfterRepair(OperationContext* opCtx,
long long numRecords,
long long dataSize);
private:
friend class VisibilityManagerChange;
/**
* This gets the next (guaranteed) unique record id.
*/
inline int64_t _nextRecordId() {
return _highestRecordId.fetchAndAdd(1);
}
/**
* Two helper functions for deleting excess records in capped record stores.
* The caller should not have an active SizeAdjuster.
*/
bool _cappedAndNeedDelete(OperationContext* opCtx, StringStore* workingCopy);
void _cappedDeleteAsNeeded(OperationContext* opCtx, StringStore* workingCopy);
const bool _isCapped;
const int64_t _cappedMaxSize;
const int64_t _cappedMaxDocs;
std::string _identStr;
StringData _ident;
std::string _prefix;
std::string _postfix;
mutable Mutex _cappedCallbackMutex =
MONGO_MAKE_LATCH("RecordStore::_cappedCallbackMutex"); // Guards _cappedCallback
CappedCallback* _cappedCallback;
mutable Mutex _cappedDeleterMutex = MONGO_MAKE_LATCH("RecordStore::_cappedDeleterMutex");
AtomicWord<long long> _highestRecordId{1};
AtomicWord<long long> _numRecords{0};
AtomicWord<long long> _dataSize{0};
std::string generateKey(const uint8_t* key, size_t key_len) const;
bool _isOplog;
VisibilityManager* _visibilityManager;
/**
* Automatically adjust the record count and data size based on the size in change of the
* underlying radix store during the life time of the SizeAdjuster.
*/
friend class SizeAdjuster;
class SizeAdjuster {
public:
SizeAdjuster(OperationContext* opCtx, RecordStore* rs);
~SizeAdjuster();
private:
OperationContext* const _opCtx;
RecordStore* const _rs;
const StringStore* _workingCopy;
const int64_t _origNumRecords;
const int64_t _origDataSize;
};
class Cursor final : public SeekableRecordCursor {
OperationContext* opCtx;
StringData _ident;
std::string _prefix;
std::string _postfix;
StringStore::const_iterator it;
boost::optional<std::string> _savedPosition;
bool _needFirstSeek = true;
bool _lastMoveWasRestore = false;
bool _isCapped;
bool _isOplog;
VisibilityManager* _visibilityManager;
public:
Cursor(OperationContext* opCtx,
const RecordStore& rs,
VisibilityManager* visibilityManager);
boost::optional<Record> next() final;
boost::optional<Record> seekExact(const RecordId& id) final override;
void save() final;
void saveUnpositioned() final override;
bool restore() final;
void detachFromOperationContext() final;
void reattachToOperationContext(OperationContext* opCtx) final;
private:
bool inPrefix(const std::string& key_string);
};
class ReverseCursor final : public SeekableRecordCursor {
OperationContext* opCtx;
StringData _ident;
std::string _prefix;
std::string _postfix;
StringStore::const_reverse_iterator it;
boost::optional<std::string> _savedPosition;
bool _needFirstSeek = true;
bool _lastMoveWasRestore = false;
bool _isCapped;
bool _isOplog;
VisibilityManager* _visibilityManager;
public:
ReverseCursor(OperationContext* opCtx,
const RecordStore& rs,
VisibilityManager* visibilityManager);
boost::optional<Record> next() final;
boost::optional<Record> seekExact(const RecordId& id) final override;
void save() final;
void saveUnpositioned() final override;
bool restore() final;
void detachFromOperationContext() final;
void reattachToOperationContext(OperationContext* opCtx) final;
private:
bool inPrefix(const std::string& key_string);
};
};
} // namespace biggie
} // namespace mongo
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