src/DiskIO/DiskDaemon/DiskdFile.h

   1 /*
   2  * DEBUG: section 79    Squid-side DISKD I/O functions.
   3  * AUTHOR: Duane Wessels
   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 __STORE_DISKDFILE_H__
  35 #define __STORE_DISKDFILE_H__
  36
  37 #include "cbdata.h"
  38 #include "DiskIO/DiskFile.h"
  39
  40 class DiskdIOStrategy;
  41
  42 struct diomsg;
  43
  44 /**
  45  \ingroup diskd
  46  */
  47 class DiskdFile : public DiskFile
  48 {
  49
  50 public:
  51     void * operator new(size_t);
  52     void operator delete(void *);
  53     DiskdFile(char const *path, DiskdIOStrategy *);
  54     ~DiskdFile();
  55     virtual void open(int flags, mode_t aMode, RefCount<IORequestor> callback);
  56     virtual void create(int flags, mode_t aMode, RefCount<IORequestor> callback);
  57     virtual void read(ReadRequest *);
  58     virtual void write(WriteRequest *);
  59     virtual void close();
  60     virtual bool error() const;
  61     virtual bool canRead() const;
  62     virtual bool ioInProgress() const;
  63
  64     /* Temporary */
  65     int getID() const {return id;}
  66
  67     void completed(diomsg *);
  68
  69 private:
  70     int id;
  71     char const *path_;
  72     bool errorOccured;
  73     DiskdIOStrategy *IO;
  74     RefCount<IORequestor> ioRequestor;
  75     void openDone(diomsg *);
  76     void createDone (diomsg *);
  77     void readDone (diomsg *);
  78     void writeDone (diomsg *);
  79     void closeDone (diomsg *);
  80     int mode;
  81     void notifyClient();
  82     bool canNotifyClient() const;
  83     void ioAway();
  84     void ioCompleted();
  85     size_t inProgressIOs;
  86
  87     CBDATA_CLASS(DiskdFile);
  88 };
  89
  90 #endif