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// rocks_sorted_data_impl.h
/**
* Copyright (C) 2014 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/sorted_data_interface.h"
#include <atomic>
#include <rocksdb/db.h>
#include "mongo/bson/ordering.h"
#include "mongo/db/storage/index_entry_comparison.h"
#pragma once
namespace rocksdb {
class ColumnFamilyHandle;
class DB;
}
namespace mongo {
class RocksRecoveryUnit;
class RocksSortedDataBuilderImpl : public SortedDataBuilderInterface {
public:
virtual Status addKey(const BSONObj& key, const DiskLoc& loc) = 0;
};
/**
* Rocks implementation of the SortedDataInterface. Each index is stored as a single column
* family. Each mapping from a BSONObj to a DiskLoc is stored as the key of a key-value pair
* in the column family. Consequently, each value in the database is simply an empty string.
* This is done because RocksDB only supports unique keys, and because RocksDB can take a custom
* comparator to use when ordering keys. We use a custom comparator which orders keys based
* first upon the BSONObj in the key, and uses the DiskLoc as a tiebreaker.
*/
class RocksSortedDataImpl : public SortedDataInterface {
MONGO_DISALLOW_COPYING( RocksSortedDataImpl );
public:
RocksSortedDataImpl(rocksdb::DB* db, boost::shared_ptr<rocksdb::ColumnFamilyHandle> cf,
std::string ident, Ordering order);
virtual SortedDataBuilderInterface* getBulkBuilder(OperationContext* txn, bool dupsAllowed);
virtual Status insert(OperationContext* txn,
const BSONObj& key,
const DiskLoc& loc,
bool dupsAllowed);
virtual void unindex(OperationContext* txn, const BSONObj& key, const DiskLoc& loc,
bool dupsAllowed);
virtual Status dupKeyCheck(OperationContext* txn, const BSONObj& key, const DiskLoc& loc);
virtual void fullValidate(OperationContext* txn, bool full, long long* numKeysOut,
BSONObjBuilder* output) const;
virtual bool isEmpty(OperationContext* txn);
virtual Status touch(OperationContext* txn) const;
virtual long long numEntries(OperationContext* txn) const;
virtual Cursor* newCursor(OperationContext* txn, int direction) const;
virtual Status initAsEmpty(OperationContext* txn);
virtual long long getSpaceUsedBytes( OperationContext* txn ) const;
//rocks specific
// ownership passes to caller. Bare because we need to pass the bare pointer to the
// rocksdb::Options class
static rocksdb::Comparator* newRocksComparator( const Ordering& order );
private:
typedef DiskLoc RecordId;
rocksdb::DB* _db; // not owned
// Each index is stored as a single column family, so this stores the handle to the
// relevant column family
boost::shared_ptr<rocksdb::ColumnFamilyHandle> _columnFamily;
std::string _ident;
// used to construct RocksCursors
const Ordering _order;
std::atomic<long long> _numEntries;
const std::string _numEntriesKey;
};
} // namespace mongo
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