src/DiskIO/Blocking/BlockingFile.h

   1 /*
   2  * DEBUG: section 47    Store Directory Routines
   3  * AUTHOR: Robert Collins
   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_BLOCKINGFILE_H
  35 #define SQUID_BLOCKINGFILE_H
  36
  37 #include "cbdata.h"
  38 #include "DiskIO/DiskFile.h"
  39 #include "DiskIO/IORequestor.h"
  40
  41 class BlockingFile : public DiskFile
  42 {
  43
  44 public:
  45     void *operator new(size_t);
  46     void operator delete(void *);
  47     BlockingFile(char const *path);
  48     ~BlockingFile();
  49     virtual void open(int flags, mode_t mode, RefCount<IORequestor> callback);
  50     virtual void create(int flags, mode_t mode, RefCount<IORequestor> callback);
  51     virtual void read(ReadRequest *);
  52     virtual void write(WriteRequest *);
  53     virtual void close();
  54     virtual bool error() const;
  55     virtual int getFD() const { return fd;}
  56
  57     virtual bool canRead() const;
  58     virtual bool ioInProgress() const;
  59
  60 private:
  61     static DRCB ReadDone;
  62     static DWCB WriteDone;
  63     int fd;
  64     bool closed;
  65     void error (bool const &);
  66     bool error_;
  67     char const *path_;
  68     RefCount<IORequestor> ioRequestor;
  69     RefCount<ReadRequest> readRequest;
  70     RefCount<WriteRequest> writeRequest;
  71     void doClose();
  72     void readDone(int fd, const char *buf, int len, int errflag);
  73     void writeDone(int fd, int errflag, size_t len);
  74
  75     CBDATA_CLASS(BlockingFile);
  76 };
  77
  78 #endif /* SQUID_BLOCKINGFILE_H */