src/DiskIO/DiskIOModule.cc

   1
   2 /*
   3  * $Id: DiskIOModule.cc,v 1.3 2006/09/14 00:51:10 robertc Exp $
   4  *
   5  * DEBUG: section 92    Storage File System
   6  * AUTHOR: Robert Collins
   7  *
   8  * SQUID Web Proxy Cache          http://www.squid-cache.org/
   9  * ----------------------------------------------------------
  10  *
  11  *  Squid is the result of efforts by numerous individuals from
  12  *  the Internet community; see the CONTRIBUTORS file for full
  13  *  details.   Many organizations have provided support for Squid's
  14  *  development; see the SPONSORS file for full details.  Squid is
  15  *  Copyrighted (C) 2001 by the Regents of the University of
  16  *  California; see the COPYRIGHT file for full details.  Squid
  17  *  incorporates software developed and/or copyrighted by other
  18  *  sources; see the CREDITS file for full details.
  19  *
  20  *  This program is free software; you can redistribute it and/or modify
  21  *  it under the terms of the GNU General Public License as published by
  22  *  the Free Software Foundation; either version 2 of the License, or
  23  *  (at your option) any later version.
  24  *
  25  *  This program is distributed in the hope that it will be useful,
  26  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  27  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28  *  GNU General Public License for more details.
  29  *
  30  *  You should have received a copy of the GNU General Public License
  31  *  along with this program; if not, write to the Free Software
  32  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  33  *
  34  * Copyright (c) 2003, Robert Collins <robertc@squid-cache.org>
  35  */
  36
  37 #include "squid.h"
  38 #include "DiskIOModule.h"
  39
  40 Vector<DiskIOModule*> *DiskIOModule::_Modules = NULL;
  41
  42 //DiskIOModule() : initialised (false) {}
  43 DiskIOModule::DiskIOModule()
  44 {
  45     /* We cannot call
  46      * ModuleAdd(*this);
  47      * here as the virtual methods are not yet available
  48      */
  49 }
  50
  51 void
  52 DiskIOModule::RegisterAllModulesWithCacheManager(void)
  53 {
  54     for (iterator i = GetModules().begin(); i != GetModules().end(); ++i)
  55         (*i)->registerWithCacheManager();
  56 }
  57
  58 void
  59 DiskIOModule::SetupAllModules()
  60 {
  61     for (iterator i = GetModules().begin(); i != GetModules().end(); ++i)
  62         /* Call the FS to set up capabilities and initialize the FS driver */
  63         (*i)->init();
  64 }
  65
  66 void
  67 DiskIOModule::ModuleAdd(DiskIOModule &instance)
  68 {
  69     iterator i = GetModules().begin();
  70
  71     while (i != GetModules().end()) {
  72         assert(strcmp((*i)->type(), instance.type()) != 0);
  73         ++i;
  74     }
  75
  76     GetModules().push_back (&instance);
  77 }
  78
  79 Vector<DiskIOModule *> const &
  80 DiskIOModule::Modules()
  81 {
  82     return GetModules();
  83 }
  84
  85 Vector<DiskIOModule*> &
  86 DiskIOModule::GetModules()
  87 {
  88     if (!_Modules)
  89         _Modules = new Vector<DiskIOModule *>;
  90
  91     return *_Modules;
  92 }
  93
  94 /*
  95  * called when a graceful shutdown is to occur
  96  * of each fs module.
  97  */
  98 void
  99 DiskIOModule::FreeAllModules()
 100 {
 101     while (GetModules().size()) {
 102         DiskIOModule *fs = GetModules().back();
 103         GetModules().pop_back();
 104         fs->shutdown();
 105     }
 106 }
 107
 108 DiskIOModule *
 109 DiskIOModule::Find(char const *type)
 110 {
 111     for (iterator i = GetModules().begin(); i != GetModules().end(); ++i)
 112         if (strcasecmp(type, (*i)->type()) == 0)
 113             return *i;
 114
 115     return NULL;
 116 }
 117
 118 DiskIOModule *
 119 DiskIOModule::FindDefault()
 120 {
 121     /* Best IO options are in order: */
 122     DiskIOModule * result;
 123     result = Find("DiskThreads");
 124     if (NULL == result)
 125         result = Find("DiskDaemon");
 126     if (NULL == result)
 127         result = Find("AIO");
 128     if (NULL == result)
 129         result = Find("Blocking");
 130     return result;
 131 }
 132
 133 /* disk modules dont export anything by default */
 134 void
 135 DiskIOModule::registerWithCacheManager(void)
 136 {}