Mantle.h

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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#ifndef CEPH_MANTLE_H
#define CEPH_MANTLE_H

#include <lua.hpp>
#include <list>
#include <map>
#include <string>
#include <vector>

// TODO: get rid of this
using namespace std;

typedef double Load;

typedef string Policy;

typedef int32_t Server;

typedef map<std::string, Load> ServerMetrics;

typedef vector<ServerMetrics> ClusterMetrics;

typedef map<Server,Load> Targets;

class Mantle {

  protected:
    lua_State *L;
    Server whoami;
    ClusterMetrics metrics;
    Policy when_callback, howmuch_callback, where_callback;
    int execute(Policy p, Server s, ClusterMetrics m);

  public:
    Mantle(Server s) : L(NULL) {
      whoami = s;
    };
   
    int when(bool &decision);

    int where(Targets &decision);

    int howmuch(Load &decision);

    int configure(Policy when, Policy where, Policy howmuch);
 
    int update(ClusterMetrics metrics);
};

#endif