src/DiskIO/Blocking/BlockingFile.h

   1 /*
   2  * $Id: BlockingFile.h,v 1.3 2008/02/26 21:49:40 amosjeffries Exp $
   3  *
   4  * DEBUG: section 47    Store Directory Routines
   5  * AUTHOR: Robert Collins
   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 SQUID_BLOCKINGFILE_H
  37 #define SQUID_BLOCKINGFILE_H
  38
  39 #include "cbdata.h"
  40 #include "DiskIO/DiskFile.h"
  41 #include "DiskIO/IORequestor.h"
  42
  43 class BlockingFile : public DiskFile
  44 {
  45
  46 public:
  47     void *operator new(size_t);
  48     void operator delete(void *);
  49     BlockingFile(char const *path);
  50     ~BlockingFile();
  51     virtual void open(int flags, mode_t mode, RefCount<IORequestor> callback);
  52     virtual void create(int flags, mode_t mode, RefCount<IORequestor> callback);
  53     virtual void read(ReadRequest *);
  54     virtual void write(WriteRequest *);
  55     virtual void close();
  56     virtual bool error() const;
  57     virtual int getFD() const { return fd;}
  58
  59     virtual bool canRead() const;
  60     virtual bool ioInProgress() const;
  61
  62 private:
  63     static DRCB ReadDone;
  64     static DWCB WriteDone;
  65     CBDATA_CLASS(BlockingFile);
  66     int fd;
  67     bool closed;
  68     void error (bool const &);
  69     bool error_;
  70     char const *path_;
  71     RefCount<IORequestor> ioRequestor;
  72     RefCount<ReadRequest> readRequest;
  73     RefCount<WriteRequest> writeRequest;
  74     void doClose();
  75     void readDone(int fd, const char *buf, int len, int errflag);
  76     void writeDone(int fd, int errflag, size_t len);
  77 };
  78
  79 #endif /* SQUID_BLOCKINGFILE_H */