text: // ephemeral_for_test_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/record_id.h"
  #include "mongo/db/storage/recovery_unit.h"
  #include "mongo/stdx/functional.h"
  
  namespace mongo {
  
  class SortedDataInterface;
  
  class EphemeralForTestRecoveryUnit : public RecoveryUnit {
  public:
      EphemeralForTestRecoveryUnit(stdx::function<void()> cb = nullptr)
          : _waitUntilDurableCallback(cb) {}
  
      void beginUnitOfWork(OperationContext* opCtx) final{};
      void commitUnitOfWork() final;
      void abortUnitOfWork() final;
  
      virtual bool waitUntilDurable() {
          if (_waitUntilDurableCallback) {
              _waitUntilDurableCallback();
          }
          return true;
      }
  
      virtual void abandonSnapshot() {}
  
      Status setReadFromMajorityCommittedSnapshot() final;
  
      virtual void registerChange(Change* change) {
          _changes.push_back(ChangePtr(change));
      }
  
      virtual void* writingPtr(void* data, size_t len) {
          MONGO_UNREACHABLE;
      }
  
      virtual void setRollbackWritesDisabled() {}
  
      virtual SnapshotId getSnapshotId() const {
          return SnapshotId();
      }
  
  private:
      typedef std::shared_ptr<Change> ChangePtr;
      typedef std::vector<ChangePtr> Changes;
  
      Changes _changes;
      stdx::function<void()> _waitUntilDurableCallback;
  };
  
  }  // namespace mongo
  