src/DiskIO/AIO/AIODiskFile.h

   1
   2 /*
   3  * $Id: AIODiskFile.h,v 1.3 2007/05/18 06:41:27 amosjeffries Exp $
   4  *
   5  * SQUID Web Proxy Cache          http://www.squid-cache.org/
   6  * ----------------------------------------------------------
   7  *
   8  *  Squid is the result of efforts by numerous individuals from
   9  *  the Internet community; see the CONTRIBUTORS file for full
  10  *  details.   Many organizations have provided support for Squid's
  11  *  development; see the SPONSORS file for full details.  Squid is
  12  *  Copyrighted (C) 2001 by the Regents of the University of
  13  *  California; see the COPYRIGHT file for full details.  Squid
  14  *  incorporates software developed and/or copyrighted by other
  15  *  sources; see the CREDITS file for full details.
  16  *
  17  *  This program is free software; you can redistribute it and/or modify
  18  *  it under the terms of the GNU General Public License as published by
  19  *  the Free Software Foundation; either version 2 of the License, or
  20  *  (at your option) any later version.
  21  *
  22  *  This program is distributed in the hope that it will be useful,
  23  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  *  GNU General Public License for more details.
  26  *
  27  *  You should have received a copy of the GNU General Public License
  28  *  along with this program; if not, write to the Free Software
  29  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  30  *
  31  * Copyright (c) 2003, Robert Collins <robertc@squid-cache.org>
  32  */
  33
  34 #ifndef SQUID_AIODISKFILE_H
  35 #define SQUID_AIODISKFILE_H
  36
  37 #include "DiskIO/DiskFile.h"
  38 #include "async_io.h"
  39 #include "cbdata.h"
  40
  41 class AIODiskIOStrategy;
  42
  43 class AIODiskFile : public DiskFile
  44 {
  45
  46 public:
  47
  48     friend class AIODiskIOStrategy;
  49     void * operator new (size_t);
  50     void operator delete (void *);
  51     AIODiskFile (char const *path, AIODiskIOStrategy *);
  52     ~AIODiskFile();
  53     virtual void open (int, mode_t, RefCount<IORequestor>);
  54     virtual void create (int, mode_t, RefCount<IORequestor>);
  55     virtual void read(ReadRequest *);
  56     virtual void write(WriteRequest *);
  57     virtual void close ();
  58     virtual bool canRead() const;
  59     virtual bool canWrite() const;
  60
  61     /* During migration only */
  62     virtual int getFD() const;
  63
  64     virtual bool error() const;
  65
  66     /* Inform callers if there is IO in progress */
  67     virtual bool ioInProgress() const;
  68
  69 private:
  70     CBDATA_CLASS(AIODiskFile);
  71     void error(bool const &);
  72     int fd;
  73     string path;
  74     AIODiskIOStrategy *strategy;
  75     RefCount<IORequestor> ioRequestor;
  76     bool closed;
  77     bool error_;
  78 };
  79
  80 #endif /* SQUID_AIODISKFILE_H */