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#ifndef _DMUCS_HOST_FILE_H_
#define _DMUCS_HOST_FILE_H_ 1
/*
* dmucs_hosts_file.h: code to read the hosts-info configuration file.
*
* Copyright (C) 2005, 2006 Victor T. Norman
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
* Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <map>
#include <string>
#ifdef PKGDATADIR
const std::string HOSTS_INFO_FILE = std::string(PKGDATADIR) + \
std::string("/") + std::string("hosts-info");
#else
const std::string HOSTS_INFO_FILE = "hosts-info";
#endif
class DmucsHostsFile
{
public:
static DmucsHostsFile *getInstance(const std::string &hostsInfoFile);
void getDataForHost(const struct in_addr &ipAddr, int *numCpus,
int *powerIndex) const;
/*
* This class implements the singleton pattern, as only one instance of
* it needs to exist, and it should take care to re-read the hostsfile,
* etc., when necessary.
*/
private:
// this is private so that it cannot be used (this is a Singleton).
DmucsHostsFile(const std::string &hostsInfoFile);
~DmucsHostsFile();
struct info_t {
int numCpus_;
int powerIndex_;
info_t(int ncpus, int pindex) :
numCpus_(ncpus), powerIndex_(pindex) {};
};
static DmucsHostsFile *instance_;
std::string hostsInfoFile_;
/*
* This maps an IP address (in 32-bit format) to the pair of values:
* numCpus and powerIndex.
*/
typedef std::map<unsigned int, info_t> host_info_db_t;
typedef host_info_db_t::iterator host_info_db_iter_t;
mutable host_info_db_t db_;
mutable time_t lastFileChangeTime_;
void readFileIntoDb() const;
/* If the file modification time has changed since the last time this
was called, then return true AND update lastFileChangeTime_ to the
new modification time. */
bool hasFileChanged() const;
};
#endif
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