CoroutineGroup.hpp

#pragma once
 
#include <boost/asio/spawn.hpp>
#include <boost/asio/steady_timer.hpp>
 
#include <atomic>
#include <cstddef>
#include <functional>
#include <optional>
 
namespace util {

class CoroutineGroup {
    boost::asio::steady_timer timer_;
    std::optional<size_t> maxChildren_;
    std::atomic_size_t childrenCounter_{0};
 
public:
    CoroutineGroup(
        boost::asio::yield_context yield,
        std::optional<size_t> maxChildren = std::nullopt
    );

    ~CoroutineGroup();

    bool
    spawn(boost::asio::yield_context yield, std::function<void(boost::asio::yield_context)> fn);

    std::optional<std::function<void()>>
    registerForeign(boost::asio::yield_context yield);

    void
    asyncWait(boost::asio::yield_context yield);

    size_t
    size() const;

    bool
    isFull() const;
 
private:
    void
    onCoroutineCompleted();
};
 
}  // namespace util