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// kv_storage_engine.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.
*/
#pragma once
#include <map>
#include <string>
#include "mongo/db/storage/kv/kv_catalog.h"
#include "mongo/db/storage/record_store.h"
#include "mongo/db/storage/storage_engine.h"
#include "mongo/stdx/mutex.h"
namespace mongo {
class KVCatalog;
class KVEngine;
class KVDatabaseCatalogEntry;
struct KVStorageEngineOptions {
KVStorageEngineOptions() :
directoryPerDB(false),
directoryForIndexes(false),
forRepair(false) {}
bool directoryPerDB;
bool directoryForIndexes;
bool forRepair;
};
class KVStorageEngine : public StorageEngine {
public:
/**
* @param engine - owneership passes to me
*/
KVStorageEngine( KVEngine* engine,
const KVStorageEngineOptions& options = KVStorageEngineOptions() );
virtual ~KVStorageEngine();
virtual void finishInit();
virtual RecoveryUnit* newRecoveryUnit();
virtual void listDatabases( std::vector<std::string>* out ) const;
virtual DatabaseCatalogEntry* getDatabaseCatalogEntry( OperationContext* opCtx,
StringData db );
virtual bool supportsDocLocking() const { return _supportsDocLocking; }
virtual Status closeDatabase( OperationContext* txn, StringData db );
virtual Status dropDatabase( OperationContext* txn, StringData db );
virtual int flushAllFiles( bool sync );
virtual bool isDurable() const;
virtual Status repairRecordStore(OperationContext* txn, const std::string& ns);
virtual void cleanShutdown();
// ------ kv ------
KVEngine* getEngine() { return _engine.get(); }
const KVEngine* getEngine() const { return _engine.get(); }
KVCatalog* getCatalog() { return _catalog.get(); }
const KVCatalog* getCatalog() const { return _catalog.get(); }
private:
class RemoveDBChange;
KVStorageEngineOptions _options;
// This must be the first member so it is destroyed last.
std::unique_ptr<KVEngine> _engine;
const bool _supportsDocLocking;
std::unique_ptr<RecordStore> _catalogRecordStore;
std::unique_ptr<KVCatalog> _catalog;
typedef std::map<std::string,KVDatabaseCatalogEntry*> DBMap;
DBMap _dbs;
mutable stdx::mutex _dbsLock;
};
}
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