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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#ifndef CEPH_MON_ELECTOR_H
#define CEPH_MON_ELECTOR_H
#include <map>
using namespace std;
#include "include/types.h"
#include "msg/Message.h"
#include "include/Context.h"
#include "common/Timer.h"
class Monitor;
class Elector {
private:
Monitor *mon;
Context *expire_event;
void reset_timer(double plus=0.0);
void cancel_timer();
epoch_t epoch; // latest epoch we've seen. odd == election, even == stable,
// electing me
bool electing_me;
utime_t start_stamp;
set<int> acked_me;
// electing them
int leader_acked; // who i've acked
utime_t ack_stamp; // and when
void bump_epoch(epoch_t e=0); // i just saw a larger epoch
class C_ElectionExpire : public Context {
Elector *elector;
public:
C_ElectionExpire(Elector *e) : elector(e) { }
void finish(int r) {
elector->expire();
}
};
void start(); // start an electing me
void defer(int who);
void expire(); // timer goes off
void victory();
void handle_propose(class MMonElection *m);
void handle_ack(class MMonElection *m);
void handle_victory(class MMonElection *m);
public:
Elector(Monitor *m) : mon(m),
expire_event(0),
epoch(0),
electing_me(false),
leader_acked(-1) { }
void init();
void shutdown();
epoch_t get_epoch() { return epoch; }
void dispatch(Message *m);
void call_election() {
start();
}
};
#endif
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