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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 <memory>
#include <string>
#include "mongo/db/catalog/collection_options.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/storage/mobile/mobile_sqlite_statement.h"
#include "mongo/db/storage/record_store.h"
#include "mongo/platform/atomic_word.h"
namespace mongo {
/**
* A RecordStore that stores all data in SQLite.
*/
class MobileRecordStore : public RecordStore {
public:
explicit MobileRecordStore(OperationContext* opCtx,
StringData ns,
const std::string& path,
const std::string& ident,
const CollectionOptions& options);
const char* name() const override;
const std::string& getIdent() const override;
bool findRecord(OperationContext* opCtx, const RecordId& recId, RecordData* rd) const override;
void deleteRecord(OperationContext* opCtx, const RecordId& dl) override;
Status insertRecords(OperationContext* opCtx,
std::vector<Record>* inOutRecords,
const std::vector<Timestamp>& timestamps) override;
Status insertRecordsWithDocWriter(OperationContext* opCtx,
const DocWriter* const* docs,
const Timestamp* timestamps,
size_t nDocs,
RecordId* idsOut) override;
Status updateRecord(OperationContext* opCtx,
const RecordId& oldLocation,
const char* data,
int len) override;
bool updateWithDamagesSupported() const override;
StatusWith<RecordData> updateWithDamages(OperationContext* opCtx,
const RecordId& recId,
const RecordData& oldRec,
const char* damageSource,
const mutablebson::DamageVector& damages) override;
std::unique_ptr<SeekableRecordCursor> getCursor(OperationContext* opCtx,
bool forward) const override;
Status truncate(OperationContext* opCtx) override;
void cappedTruncateAfter(OperationContext* opCtx, RecordId end, bool inclusive) override {
// Capped Collections are not supported, do nothing
}
bool compactSupported() const override {
return false;
}
bool compactsInPlace() const override {
return false;
}
Status validate(OperationContext* opCtx,
ValidateCmdLevel level,
ValidateAdaptor* adaptor,
ValidateResults* results,
BSONObjBuilder* output) override;
void appendCustomStats(OperationContext* opCtx,
BSONObjBuilder* result,
double scale) const override {
// No custom stats to add
}
Status touch(OperationContext* opCtx, BSONObjBuilder* output) const override;
int64_t storageSize(OperationContext* opCtx,
BSONObjBuilder* extraInfo = NULL,
int infoLevel = 0) const override;
long long dataSize(OperationContext* opCtx) const override;
long long numRecords(OperationContext* opCtx) const override;
boost::optional<RecordId> oplogStartHack(OperationContext* opCtx,
const RecordId& startingPosition) const override;
void waitForAllEarlierOplogWritesToBeVisible(OperationContext* opCtx) const override {}
void updateStatsAfterRepair(OperationContext* opCtx,
long long numRecords,
long long dataSize) override {}
bool isCapped() const override {
// Capped Collections are not supported
return false;
}
void setCappedCallback(CappedCallback* cb) override {
// Capped Collections are not supported, do nothing
}
// Not in record store API.
/**
* Creates a new record store inside SQLite.
* Transational semantics are handled by the caller.
*/
static void create(OperationContext* opCtx, const std::string& ident);
private:
class InsertChange;
class RemoveChange;
class TruncateChange;
class NumRecsChange;
class DataSizeChange;
class Cursor;
RecordId _nextId();
const std::string _path;
const std::string _ident;
AtomicWord<long long> _nextIdNum;
/**
* Fetches the number of records from the database. _numRecsMutex should be locked before this
* is called.
*/
void _initNumRecsIfNeeded_inlock(OperationContext* opCtx) const;
/**
* Updates _numRecords. This must be called before the actual change is made to the database.
*/
void _changeNumRecs(OperationContext* opCtx, int64_t diff);
/**
* Resets _numRecords to the new value. Returns true if _numRecs was reset; returns false
* otherwise.
*/
bool _resetNumRecsIfNeeded(OperationContext* opCtx, int64_t newNumRecs);
mutable int64_t _numRecs;
mutable stdx::mutex _numRecsMutex;
mutable bool _isNumRecsInitialized = false;
/**
* Fetches the data size from the database. _dataSizeMutex should be locked before this is
* called.
*/
void _initDataSizeIfNeeded_inlock(OperationContext* opCtx) const;
/**
* Updates _dataSize. This must be called before the actual change is made to the database.
*/
void _changeDataSize(OperationContext* opCtx, int64_t diff);
/**
* Resets _dataSize to the new value. Returns true if _dataSize was reset; returns false
* otherwise.
*/
bool _resetDataSizeIfNeeded(OperationContext* opCtx, int64_t newDataSize);
mutable int64_t _dataSize;
mutable stdx::mutex _dataSizeMutex;
mutable bool _isDataSizeInitialized = false;
};
} // namespace mongo
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