src/DiskIO/DiskDaemon/DiskdFile.h

   1 /*
   2  * $Id$
   3  *
   4  * DEBUG: section 79    Squid-side DISKD I/O functions.
   5  * AUTHOR: Duane Wessels
   6  *
   7  * SQUID Web Proxy Cache          http://www.squid-cache.org/
   8  * ----------------------------------------------------------
   9  *
  10  *  Squid is the result of efforts by numerous individuals from
  11  *  the Internet community; see the CONTRIBUTORS file for full
  12  *  details.   Many organizations have provided support for Squid's
  13  *  development; see the SPONSORS file for full details.  Squid is
  14  *  Copyrighted (C) 2001 by the Regents of the University of
  15  *  California; see the COPYRIGHT file for full details.  Squid
  16  *  incorporates software developed and/or copyrighted by other
  17  *  sources; see the CREDITS file for full details.
  18  *
  19  *  This program is free software; you can redistribute it and/or modify
  20  *  it under the terms of the GNU General Public License as published by
  21  *  the Free Software Foundation; either version 2 of the License, or
  22  *  (at your option) any later version.
  23  *
  24  *  This program is distributed in the hope that it will be useful,
  25  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  26  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  *  GNU General Public License for more details.
  28  *
  29  *  You should have received a copy of the GNU General Public License
  30  *  along with this program; if not, write to the Free Software
  31  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  32  *
  33  * Copyright (c) 2003, Robert Collins <robertc@squid-cache.org>
  34  */
  35
  36 #ifndef __STORE_DISKDFILE_H__
  37 #define __STORE_DISKDFILE_H__
  38
  39 #include "cbdata.h"
  40 #include "DiskIO/DiskFile.h"
  41
  42 class DiskdIOStrategy;
  43
  44 struct diomsg;
  45
  46 /**
  47  \ingroup diskd
  48  */
  49 class DiskdFile : public DiskFile
  50 {
  51
  52 public:
  53     void * operator new(size_t);
  54     void operator delete(void *);
  55     DiskdFile(char const *path, DiskdIOStrategy *);
  56     ~DiskdFile();
  57     virtual void open(int flags, mode_t aMode, RefCount<IORequestor> callback);
  58     virtual void create(int flags, mode_t aMode, RefCount<IORequestor> callback);
  59     virtual void read(ReadRequest *);
  60     virtual void write(WriteRequest *);
  61     virtual void close();
  62     virtual bool error() const;
  63     virtual bool canRead() const;
  64     virtual bool ioInProgress() const;
  65
  66     /* Temporary */
  67     int getID() const {return id;}
  68
  69     void completed(diomsg *);
  70
  71 private:
  72     int id;
  73     char const *path_;
  74     bool errorOccured;
  75     DiskdIOStrategy *IO;
  76     RefCount<IORequestor> ioRequestor;
  77     CBDATA_CLASS(DiskdFile);
  78     void openDone(diomsg *);
  79     void createDone (diomsg *);
  80     void readDone (diomsg *);
  81     void writeDone (diomsg *);
  82     void closeDone (diomsg *);
  83     int mode;
  84     void notifyClient();
  85     bool canNotifyClient() const;
  86     void ioAway();
  87     void ioCompleted();
  88     size_t inProgressIOs;
  89 };
  90
  91 #endif