submitters.h

#pragma once
 
#include <csf/Scheduler.h>
#include <csf/SimTime.h>
#include <csf/Tx.h>
 
#include <cstddef>
#include <cstdint>
#include <type_traits>
 
namespace xrpl::test::csf {
 
// Submitters are classes for simulating submission of transactions to the
// network

struct Rate
{
    std::size_t count;
    SimDuration duration;
 
    [[nodiscard]] double
    inv() const
    {
        return duration.count() / double(count);
    }
};

template <class Distribution, class Generator, class Selector>
class Submitter
{
    Distribution dist_;
    SimTime stop_;
    std::uint32_t nextID_ = 0;
    Selector selector_;
    Scheduler& scheduler_;
    Generator& g_;
 
    // Convert generated durations to SimDuration
    static SimDuration
    asDuration(SimDuration d)
    {
        return d;
    }
 
    template <class T>
    static SimDuration
    asDuration(T t)
        requires(std::is_arithmetic_v<T>)
    {
        return SimDuration{static_cast<SimDuration::rep>(t)};
    }
 
    void
    submit()
    {
        selector_()->submit(Tx{nextID_++});
        if (scheduler_.now() < stop_)
        {
            scheduler_.in(asDuration(dist_(g_)), [&]() { submit(); });
        }
    }
 
public:
    Submitter(
        Distribution dist,
        SimTime start,
        SimTime end,
        Selector& selector,
        Scheduler& s,
        Generator& g)
        : dist_{dist}, stop_{end}, selector_{selector}, scheduler_{s}, g_{g}
    {
        scheduler_.at(start, [&]() { submit(); });
    }
};
 
template <class Distribution, class Generator, class Selector>
Submitter<Distribution, Generator, Selector>
makeSubmitter(
    Distribution dist,
    SimTime start,
    SimTime end,
    Selector& sel,
    Scheduler& s,
    Generator& g)
{
    return Submitter<Distribution, Generator, Selector>(dist, start, end, sel, s, g);
}
 
}  // namespace xrpl::test::csf