text: // heap1_recovery_unit.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 <vector>
  
  #include "mongo/db/diskloc.h"
  #include "mongo/db/storage/recovery_unit.h"
  
  namespace mongo {
  
      class SortedDataInterface;
  
      class Heap1RecoveryUnit : public RecoveryUnit {
      public:
          Heap1RecoveryUnit() {
              _rollbackPossible = true;
          }
  
          virtual ~Heap1RecoveryUnit();
  
          virtual void beginUnitOfWork();
          virtual void commitUnitOfWork();
          virtual void endUnitOfWork();
  
          virtual bool awaitCommit() {
              return true;
          }
  
          virtual void registerChange(Change* change) {
          }
  
          virtual void* writingPtr(void* data, size_t len) {
              return data;
          }
  
          virtual void syncDataAndTruncateJournal() {}
  
          // -------------
  
          void rollbackImpossible() { _rollbackPossible = false; }
  
          void notifyIndexMod( SortedDataInterface* idx,
                               const BSONObj& obj, const DiskLoc& loc, bool insert );
  
          static void notifyIndexInsert( OperationContext* ctx, SortedDataInterface* idx,
                                         const BSONObj& obj, const DiskLoc& loc );
          static void notifyIndexRemove( OperationContext* ctx, SortedDataInterface* idx,
                                         const BSONObj& obj, const DiskLoc& loc );
  
      private:
          bool _rollbackPossible;
  
          struct IndexInfo {
              SortedDataInterface* idx;
              BSONObj obj;
              DiskLoc loc;
              bool insert;
          };
  
          struct Frame {
              std::vector<IndexInfo> indexMods;
          };
  
          std::vector<Frame> _frames;
      };
  
  }
  