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/**
* 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.
*/
#pragma once
#include <list>
#include <map>
#include <string>
#include <memory>
#include <boost/optional.hpp>
#include <boost/scoped_ptr.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/thread/mutex.hpp>
#include <rocksdb/cache.h>
#include <rocksdb/status.h>
#include "mongo/base/disallow_copying.h"
#include "mongo/bson/ordering.h"
#include "mongo/db/storage/kv/kv_engine.h"
#include "mongo/db/storage/rocks/rocks_transaction.h"
#include "mongo/util/string_map.h"
namespace rocksdb {
class ColumnFamilyHandle;
struct ColumnFamilyDescriptor;
struct ColumnFamilyOptions;
class DB;
class Comparator;
class Iterator;
struct Options;
struct ReadOptions;
}
namespace mongo {
struct CollectionOptions;
class RocksEngine : public KVEngine {
MONGO_DISALLOW_COPYING( RocksEngine );
public:
RocksEngine(const std::string& path, bool durable);
virtual ~RocksEngine();
virtual RecoveryUnit* newRecoveryUnit() override;
virtual Status createRecordStore(OperationContext* opCtx,
const StringData& ns,
const StringData& ident,
const CollectionOptions& options) override;
virtual RecordStore* getRecordStore(OperationContext* opCtx, const StringData& ns,
const StringData& ident,
const CollectionOptions& options) override;
virtual Status createSortedDataInterface(OperationContext* opCtx, const StringData& ident,
const IndexDescriptor* desc) override;
virtual SortedDataInterface* getSortedDataInterface(OperationContext* opCtx,
const StringData& ident,
const IndexDescriptor* desc) override;
virtual Status dropIdent(OperationContext* opCtx, const StringData& ident) override;
virtual bool hasIdent(OperationContext* opCtx, const StringData& ident) const {
return _identColumnFamilyMap.find(ident) != _identColumnFamilyMap.end();;
}
virtual std::vector<std::string> getAllIdents( OperationContext* opCtx ) const override;
virtual bool supportsDocLocking() const override {
return true;
}
virtual bool supportsDirectoryPerDB() const override {
return false;
}
virtual bool isDurable() const override { return _durable; }
virtual int64_t getIdentSize(OperationContext* opCtx,
const StringData& ident) {
// TODO: return correct size.
return 1;
}
virtual Status repairIdent(OperationContext* opCtx,
const StringData& ident) {
return Status::OK();
}
virtual void cleanShutdown() {}
// rocks specific api
rocksdb::DB* getDB() { return _db.get(); }
const rocksdb::DB* getDB() const { return _db.get(); }
private:
bool _existsColumnFamily(const StringData& ident);
Status _createColumnFamily(const rocksdb::ColumnFamilyOptions& options,
const StringData& ident);
Status _dropColumnFamily(const StringData& ident);
boost::shared_ptr<rocksdb::ColumnFamilyHandle> _getColumnFamily(const StringData& ident);
std::unordered_map<std::string, Ordering> _loadOrderingMetaData(rocksdb::Iterator* itr);
std::set<std::string> _loadCollections(rocksdb::Iterator* itr);
std::vector<std::string> _loadColumnFamilies();
rocksdb::ColumnFamilyOptions _collectionOptions();
rocksdb::ColumnFamilyOptions _indexOptions(const Ordering& order);
rocksdb::Options _dbOptions();
rocksdb::ColumnFamilyOptions _defaultCFOptions();
std::string _path;
boost::scoped_ptr<rocksdb::DB> _db;
std::shared_ptr<rocksdb::Cache> _block_cache;
const bool _durable;
// Default column family is owned by the rocksdb::DB instance.
rocksdb::ColumnFamilyHandle* _defaultHandle;
mutable boost::mutex _identColumnFamilyMapMutex;
typedef StringMap<boost::shared_ptr<rocksdb::ColumnFamilyHandle> > IdentColumnFamilyMap;
IdentColumnFamilyMap _identColumnFamilyMap;
// This is for concurrency control
RocksTransactionEngine _transactionEngine;
static const std::string kOrderingPrefix;
static const std::string kCollectionPrefix;
};
Status toMongoStatus( rocksdb::Status s );
}
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