text: // mmap_v1_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 <boost/thread/mutex.hpp>
  
  #include "mongo/db/storage/storage_engine.h"
  
  namespace mongo {
  
      class MMAPV1DatabaseCatalogEntry;
  
      class MMAPV1Engine : public StorageEngine {
      public:
          MMAPV1Engine();
          virtual ~MMAPV1Engine();
  
          void finishInit();
  
          RecoveryUnit* newRecoveryUnit( OperationContext* opCtx );
          void listDatabases( std::vector<std::string>* out ) const;
          int flushAllFiles( bool sync );
  
          Status repairDatabase( OperationContext* tnx,
                                 const std::string& dbName,
                                 bool preserveClonedFilesOnFailure,
                                 bool backupOriginalFiles );
  
          DatabaseCatalogEntry* getDatabaseCatalogEntry( OperationContext* opCtx,
                                                         const StringData& db );
  
          virtual bool supportsDocLocking() const { return false; }
          virtual bool isMmapV1() const { return true; }
  
          virtual bool isDurable() const;
  
          virtual Status closeDatabase(OperationContext* txn, const StringData& db);
  
          virtual Status dropDatabase(OperationContext* txn, const StringData& db);
  
          virtual void cleanShutdown();
  
      private:
          static void _listDatabases( const std::string& directory,
                                      std::vector<std::string>* out );
  
          boost::mutex _entryMapMutex;
          typedef std::map<std::string,MMAPV1DatabaseCatalogEntry*> EntryMap;
          EntryMap _entryMap;
      };
  
      void _deleteDataFiles(const std::string& database);
  }
  