src/fs/ufs/UFSStrategy.h

   1 /*
   2  * Copyright (C) 1996-2019 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 #ifndef SQUID_FS_UFS_UFSSTRATEGY_H
  10 #define SQUID_FS_UFS_UFSSTRATEGY_H
  11
  12 #include "DiskIO/DiskFile.h"
  13 #include "StoreIOState.h"
  14
  15 class Swapdir;
  16 class StoreEntry;
  17 class DiskIOStrategy;
  18
  19 namespace Fs
  20 {
  21 namespace Ufs
  22 {
  23 /// \ingroup UFS
  24 class UFSStrategy
  25 {
  26 public:
  27     UFSStrategy (DiskIOStrategy *);
  28     virtual ~UFSStrategy ();
  29     virtual bool shedLoad();
  30
  31     virtual int load();
  32
  33     StoreIOState::Pointer createState(SwapDir *SD, StoreEntry *e, StoreIOState::STIOCB * callback, void *callback_data) const;
  34     /* UFS specific */
  35     virtual RefCount<DiskFile> newFile (char const *path);
  36     StoreIOState::Pointer open(SwapDir *, StoreEntry *, StoreIOState::STFNCB *,
  37                                StoreIOState::STIOCB *, void *);
  38     StoreIOState::Pointer create(SwapDir *, StoreEntry *, StoreIOState::STFNCB *,
  39                                  StoreIOState::STIOCB *, void *);
  40
  41     virtual void unlinkFile (char const *);
  42     virtual void sync();
  43
  44     virtual int callback();
  45
  46     /** Init per-instance logic */
  47     virtual void init();
  48
  49     /** cachemgr output on the IO instance stats */
  50     virtual void statfs(StoreEntry & sentry)const;
  51
  52     /** The io strategy in use */
  53     DiskIOStrategy *io;
  54
  55 protected:
  56
  57     friend class UFSSwapDir;
  58
  59 private:
  60     UFSStrategy(); //disabled
  61     UFSStrategy(UFSStrategy const &); //disabled
  62     UFSStrategy &operator=(UFSStrategy const &); //disabled
  63
  64 };
  65
  66 } //namespace Ufs
  67 } //namespace Fs
  68
  69 #endif /* SQUID_FS_UFS_UFSSTRATEGY_H */
  70