src/AbstractSingleDiskAdaptor.h - master - githubmirror/aria2

src/AbstractSingleDiskAdaptor.h
114 строк4 KB
Ali MJ Al-Nasrawy
flush OS write buffers before saving control file
17 июн 2020, 11:07
17 июн 2020, 11:0701969fc
/* <!-- copyright */
/*
 * aria2 - The high speed download utility
 *
 * Copyright (C) 2006 Tatsuhiro Tsujikawa
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * In addition, 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 two.
 * You must obey the GNU General Public License in all respects
 * for all of the code used other than OpenSSL.  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 here.
 */
/* copyright --> */
#ifndef D_ABSTRACT_SINGLE_DISK_ADAPTOR_H
#define D_ABSTRACT_SINGLE_DISK_ADAPTOR_H

#include "DiskAdaptor.h"

namespace aria2 {

class DiskWriter;
class FileAllocationIterator;

class AbstractSingleDiskAdaptor : public DiskAdaptor {
private:
  std::unique_ptr<DiskWriter> diskWriter_;
  int64_t totalLength_;
  bool readOnly_;

public:
  AbstractSingleDiskAdaptor();

  virtual ~AbstractSingleDiskAdaptor();

  virtual void initAndOpenFile() CXX11_OVERRIDE;

  virtual void openFile() CXX11_OVERRIDE;

  virtual void closeFile() CXX11_OVERRIDE;

  virtual void openExistingFile() CXX11_OVERRIDE;

  virtual void writeData(const unsigned char* data, size_t len,
                         int64_t offset) CXX11_OVERRIDE;

  virtual ssize_t readData(unsigned char* data, size_t len,
                           int64_t offset) CXX11_OVERRIDE;

  virtual ssize_t readDataDropCache(unsigned char* data, size_t len,
                                    int64_t offset) CXX11_OVERRIDE;

  virtual void writeCache(const WrDiskCacheEntry* entry) CXX11_OVERRIDE;

  virtual void flushOSBuffers() CXX11_OVERRIDE;

  virtual bool fileExists() CXX11_OVERRIDE;

  virtual int64_t size() CXX11_OVERRIDE;

  virtual void truncate(int64_t length) CXX11_OVERRIDE;

  virtual std::unique_ptr<FileAllocationIterator>
  fileAllocationIterator() CXX11_OVERRIDE;

  // Make sure that DiskWriter is set before calling this function.
  virtual void enableReadOnly() CXX11_OVERRIDE;

  // Make sure that DiskWriter is set before calling this function.
  virtual void disableReadOnly() CXX11_OVERRIDE;

  virtual bool isReadOnlyEnabled() const CXX11_OVERRIDE { return readOnly_; }

  virtual void enableMmap() CXX11_OVERRIDE;

  virtual void cutTrailingGarbage() CXX11_OVERRIDE;

  virtual const std::string& getFilePath() = 0;

  void setDiskWriter(std::unique_ptr<DiskWriter> diskWriter);

  const std::unique_ptr<DiskWriter>& getDiskWriter() const
  {
    return diskWriter_;
  }

  void setTotalLength(int64_t totalLength);

  int64_t getTotalLength() const { return totalLength_; }
};

} // namespace aria2

#endif // D_ABSTRACT_SINGLE_DISK_ADAPTOR_H