config.h

/***************************************************************************
 * include/stxxl/bits/mng/config.h
 *
 * Part of the STXXL. See http://stxxl.sourceforge.net
 *
 * Copyright (C) 2002-2005 Roman Dementiev <[email protected]>
 * Copyright (C) 2008, 2009 Andreas Beckmann <[email protected]>
 *
 * Distributed under the Boost Software License, Version 1.0.
 * (See accompanying file LICENSE_1_0.txt or copy at
 * http://www.boost.org/LICENSE_1_0.txt)
 **************************************************************************/

#ifndef STXXL_MNG__CONFIG_H
#define STXXL_MNG__CONFIG_H

#include <vector>
#include <string>
#include <cstdlib>

#include <stxxl/bits/singleton.h>
#include <stxxl/bits/verbose.h>


__STXXL_BEGIN_NAMESPACE


class config : public singleton<config>
{
 friend class singleton<config>;

 struct DiskEntry
 {
 std::string path;
 std::string io_impl;
 stxxl::int64 size;
 bool delete_on_exit;
 bool autogrow;
 };

 std::vector<DiskEntry> disks_props;

 // in disks_props, flash devices come after all regular disks
 unsigned first_flash;

 config()
 {
 const char * cfg_path = getenv("STXXLCFG");
 if (cfg_path)
 init(cfg_path);
 else
 init();
 }

 ~config()
 {
 for (unsigned i = 0; i < disks_props.size(); ++i) {
 if (disks_props[i].delete_on_exit || disks_props[i].autogrow) {
 if (!disks_props[i].autogrow) {
 STXXL_ERRMSG("Removing disk file created from default configuration: " << disks_props[i].path);
 }
 unlink(disks_props[i].path.c_str());
 }
 }
 }

 void init(const char * config_path = "./.stxxl");

public:
 inline unsigned disks_number() const
 {
 return disks_props.size();
 }

 inline std::pair<unsigned, unsigned> regular_disk_range() const
 {
 return std::pair<unsigned, unsigned>(0, first_flash);
 }

 inline std::pair<unsigned, unsigned> flash_range() const
 {
 return std::pair<unsigned, unsigned>(first_flash, (unsigned)disks_props.size());
 }

 inline const std::string & disk_path(int disk) const
 {
 return disks_props[disk].path;
 }

 inline stxxl::int64 disk_size(int disk) const
 {
 return disks_props[disk].size;
 }

 inline const std::string & disk_io_impl(int disk) const
 {
 return disks_props[disk].io_impl;
 }
};

__STXXL_END_NAMESPACE

#endif // !STXXL_MNG__CONFIG_H
// vim: et:ts=4:sw=4