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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab ft=cpp
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2019 Red Hat, Inc.
* (C) 2019 SUSE LLC
* 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.
*
*/
#pragma once
#include "common/ceph_time.h"
#include "common/ceph_context.h"
#include "common/config.h"
#include "common/async/yield_context.h"
#include "rgw_dmclock.h"
namespace rgw::dmclock {
using crimson::dmclock::ReqParams;
using crimson::dmclock::PhaseType;
using crimson::dmclock::AtLimit;
using crimson::dmclock::Time;
using crimson::dmclock::get_time;
/// function to provide client counters
using GetClientCounters = std::function<PerfCounters*(client_id)>;
struct Request {
client_id client;
Time started;
Cost cost;
};
enum class ReqState {
Wait,
Ready,
Cancelled
};
template <typename F>
class Completer {
public:
Completer(F &&f): f(std::move(f)) {}
// Default constructor is needed as we need to create an empty completer
// that'll be move assigned later in process request
Completer() = default;
~Completer() {
if (f) {
f();
}
}
Completer(const Completer&) = delete;
Completer& operator=(const Completer&) = delete;
Completer(Completer&& other) = default;
Completer& operator=(Completer&& other) = default;
private:
F f;
};
using SchedulerCompleter = Completer<std::function<void()>>;
class Scheduler {
public:
auto schedule_request(const client_id& client, const ReqParams& params,
const Time& time, const Cost& cost,
optional_yield yield)
{
int r = schedule_request_impl(client,params,time,cost,yield);
return std::make_pair(r,SchedulerCompleter(std::bind(&Scheduler::request_complete,this)));
}
virtual void request_complete() {};
virtual ~Scheduler() {};
private:
virtual int schedule_request_impl(const client_id&, const ReqParams&,
const Time&, const Cost&,
optional_yield) = 0;
};
} // namespace rgw::dmclock
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