mlBackgroundTaskHandle.h

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/*************************************************************************************
**
** Copyright 2009, MeVis Medical Solutions AG
**
** The user may use this file in accordance with the license agreement provided with
** the Software or, alternatively, in accordance with the terms contained in a
** written agreement between the user and MeVis Medical Solutions AG.
**
** For further information use the contact form at https://www.mevislab.de/contact
**
**************************************************************************************/
 
#ifndef ML_BACKGROUND_TASK_HANDLE_H
#define ML_BACKGROUND_TASK_HANDLE_H
 
// Local includes
#include "MLBackgroundTasksSystem.h"
 
ML_START_NAMESPACE
 
//-----------------------------------------------------------------------
 
class BackgroundTask;
 
 
class MLBACKGROUNDTASKS_EXPORT BackgroundTaskHandle
{
public:
  BackgroundTaskHandle() { _task = nullptr; }
 
  void clear();
 
  bool hasTask() const;
 
  bool hasRunningTask() const;
 
  bool isCanceled() const;
 
  void cancel();
 
  void setOwnerWasDeleted();
 
protected:
  friend class BackgroundTaskManager;
  friend class BackgroundTaskHandleAccessor;
  BackgroundTaskHandle(BackgroundTask* task) { _task = task; }
 
  BackgroundTask* _task;
};
 
class BackgroundTaskHandleAccessor
{
public:
  inline static BackgroundTask* get(const BackgroundTaskHandle& handle) { return handle._task; }
};
 
ML_END_NAMESPACE
 
#endif