AsyncIOTask.h++

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/* ---------------------------------------------------------------------------
   commonc++ - A C++ Common Class Library
   Copyright (C) 2005-2014  Mark A Lindner

   This file is part of commonc++.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   ---------------------------------------------------------------------------
*/

#ifndef __ccxx_AsyncIOTask_hxx
#define __ccxx_AsyncIOTask_hxx

#include <commonc++/Common.h++>

#include <commonc++/Buffer.h++>
#include <commonc++/IOException.h++>
#include <commonc++/InterruptedException.h++>

#ifdef CCXX_OS_POSIX
struct aiocb;
#endif

namespace ccxx {

class COMMONCPP_API AsyncIOTask
{
  friend class Stream;
  friend class AsyncIOPoller;

 public:

  AsyncIOTask();

  ~AsyncIOTask();

  bool isCompleted();

  void cancel();

  void waitFor(timespan_ms_t timeout);

  size_t getBytesTransferred();

 private:

  void init(FileHandle file, int64_t offset, byte_t* buf, size_t buflen);
  void init(FileHandle file, int64_t offset, ByteBuffer* buf);

  void _init(FileHandle file, int64_t offset, byte_t* buf, size_t buflen);

  void _collectResult();

  inline void setPending(bool pending)
  { _pending = pending; }

  inline FileHandle getFileHandle()
  { return(_file); }

#if defined(CCXX_OS_WINDOWS)
  inline LPOVERLAPPED getControlBlock()
  { return(&_overlapped); }
#elif !defined(CCXX_OS_ANDROID)
  inline struct aiocb *getControlBlock()
  { return (_aiocb); }
#endif

  FileHandle _file;
  size_t _result;
  bool _pending;
  bool _haveResult;
  ByteBuffer* _buffer;
#if defined(CCXX_OS_WINDOWS)
  DWORD _length;
  mutable OVERLAPPED _overlapped;
#elif !defined(CCXX_OS_ANDROID)
  mutable struct aiocb* _aiocb;
#endif
};

} // namespace ccxx

#endif // __ccxx_AsyncIOTask_hxx