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#ifndef _DMUCS_HOST_STATE_H_
#define _DMUCS_HOST_STATE_H_ 1
/*
* dmucs_host_state.cc: the DMUCS host state definition.
*
* 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 "dmucs_host.h"
/*
* States of DmucsHosts:
* o available -- we got a status "avail" message for the host and/or we are
* periodically receiving load average messages from it. (Note: we may
* not always receive the status message -- when the host comes up before
* the Dmucs server. In that case, we treat the load average message as
* a status "avail" message.
* o unavailable -- we got a status "unavail" message from the host. We
* may still be receiving load average messages from it, but it has been
* made "administratively" unavailable.
* o overloaded -- the load average messages we receive indicate that the
* machine is very busy, and shouldn't be used for compiles.
* o silent -- we got a status "avail" message from the host, but now we
* are not getting any load average messages from it.
*/
class DmucsHostState
{
public:
virtual void avail(DmucsHost *host) {}
virtual void unavail(DmucsHost *host) {}
virtual void silent(DmucsHost *host) {}
virtual void overloaded(DmucsHost *host) {}
virtual void addToDb(DmucsHost *host) {}
virtual void removeFromDb(DmucsHost *host) {}
virtual const char *dump() { return "Unknown"; }
virtual int asInt() { return (int) STATUS_UNKNOWN; }
protected:
void changeState(DmucsHost *host, DmucsHostState *newState) {
host->changeState(newState);
}
};
class DmucsHostStateAvail : public DmucsHostState
{
public:
virtual void unavail(DmucsHost *host);
virtual void silent(DmucsHost *host);
virtual void overloaded(DmucsHost *host);
virtual int asInt() { return (int) STATUS_AVAILABLE; }
virtual void addToDb(DmucsHost *host);
virtual void removeFromDb(DmucsHost *host);
virtual const char *dump() { return "Available"; }
static DmucsHostStateAvail *getInstance();
private:
DmucsHostStateAvail() {}
static DmucsHostStateAvail *instance_;
};
class DmucsHostStateUnavail : public DmucsHostState
{
public:
virtual void avail(DmucsHost *host);
virtual int asInt() { return (int) STATUS_UNAVAILABLE; }
virtual void addToDb(DmucsHost *host);
virtual void removeFromDb(DmucsHost *host);
virtual const char *dump() { return "Unavail"; }
static DmucsHostStateUnavail *getInstance();
private:
DmucsHostStateUnavail() {}
static DmucsHostStateUnavail *instance_;
};
class DmucsHostStateSilent : public DmucsHostState
{
public:
virtual void avail(DmucsHost *host);
virtual void unavail(DmucsHost *host);
virtual int asInt() { return (int) STATUS_SILENT; };
virtual void addToDb(DmucsHost *host);
virtual void removeFromDb(DmucsHost *host);
virtual const char *dump() { return "Silent"; }
static DmucsHostStateSilent *getInstance();
private:
DmucsHostStateSilent() {}
static DmucsHostStateSilent *instance_;
};
class DmucsHostStateOverloaded : public DmucsHostState
{
public:
virtual void avail(DmucsHost *host);
virtual void unavail(DmucsHost *host);
virtual void silent(DmucsHost *host);
virtual int asInt() { return (int) STATUS_OVERLOADED; }
virtual void addToDb(DmucsHost *host);
virtual void removeFromDb(DmucsHost *host);
virtual const char *dump() { return "Overloaded"; }
static DmucsHostStateOverloaded *getInstance();
private:
DmucsHostStateOverloaded() {}
static DmucsHostStateOverloaded *instance_;
};
#endif
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