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// in_memory_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 "mongo/db/storage/kv/kv_engine.h"
#include "mongo/stdx/mutex.h"
#include "mongo/util/string_map.h"
namespace mongo {
class InMemoryEngine : public KVEngine {
public:
virtual RecoveryUnit* newRecoveryUnit();
virtual Status createRecordStore( OperationContext* opCtx,
StringData ns,
StringData ident,
const CollectionOptions& options );
virtual RecordStore* getRecordStore( OperationContext* opCtx,
StringData ns,
StringData ident,
const CollectionOptions& options );
virtual Status createSortedDataInterface( OperationContext* opCtx,
StringData ident,
const IndexDescriptor* desc );
virtual SortedDataInterface* getSortedDataInterface( OperationContext* opCtx,
StringData ident,
const IndexDescriptor* desc );
virtual Status dropIdent( OperationContext* opCtx,
StringData ident );
virtual bool supportsDocLocking() const { return false; }
virtual bool supportsDirectoryPerDB() const { return false; }
/**
* This is sort of strange since "durable" has no meaning...
*/
virtual bool isDurable() const { return true; }
virtual int64_t getIdentSize( OperationContext* opCtx,
StringData ident );
virtual Status repairIdent( OperationContext* opCtx,
StringData ident ) {
return Status::OK();
}
virtual void cleanShutdown() {};
virtual bool hasIdent(OperationContext* opCtx, StringData ident) const {
return _dataMap.find(ident) != _dataMap.end();;
}
std::vector<std::string> getAllIdents( OperationContext* opCtx ) const;
private:
typedef StringMap<std::shared_ptr<void> > DataMap;
mutable stdx::mutex _mutex;
DataMap _dataMap; // All actual data is owned in here
};
}
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