orotool/src/evloop.cpp

#include "evloop.hpp"
#include <ev++.h>
#include <thread>
#include <vector>
#include <iostream>
#include <algorithm>
#include <random>
#include <functional>
#include <string>

namespace duck {
namespace {
	auto time_rand = std::bind(std::uniform_int_distribution<int>(2, 8), std::mt19937(std::time(0)));

	class HtmlFetchTimer : public EvTimerTask {
	public:
		HtmlFetchTimer (ev::loop_ref& loop, tf::Subflow* subflow, std::string&& url) :
			EvTimerTask(static_cast<double>(time_rand()), loop, subflow),
			m_url(std::move(url))
		{
		}

		virtual void on_timer() override {
			subflow().emplace([this]() {std::cout << "Timer elapsed for " << m_url << "!\n";});
		}

	private:
		std::string m_url;
	};

	class EvThreadPool {
	public:
		typedef std::thread thread_t;
		EvThreadPool() :
			m_loop(ev::AUTO)
		{
		}

		void start() {
			m_taskflow.emplace([this](tf::Subflow& subflow){main_loop(subflow);});
			m_executor.run(m_taskflow);
		}

		void join() {
			m_executor.wait_for_all();
			std::cout << "all tasks completed\n";
		}

	private:
		void main_loop (tf::Subflow& subflow) {
			m_timer = std::make_unique<HtmlFetchTimer>(m_loop, &subflow, "lalalala");

			this->m_loop.run(0);
		}

		ev::default_loop m_loop;
		tf::Taskflow m_taskflow;
		tf::Executor m_executor;
		std::unique_ptr<HtmlFetchTimer> m_timer;
	};
} //unnamed namespace

EvTimerTask::EvTimerTask (double delay, ev::loop_ref& loop, tf::Subflow* subflow) :
	m_subflow(subflow)
{
	this->set(loop);
	this->set<EvTimerTask, &EvTimerTask::on_timer_ev>(this);
	ev::timer::start(delay, 0.0);
}

tf::Subflow& EvTimerTask::subflow() {
	return *m_subflow;
}

void EvTimerTask::on_timer_ev() {
	this->on_timer();
}

void test() {
	//const auto processor_count = std::thread::hardware_concurrency();
	EvThreadPool worker; //(std::max(2U, processor_count) - 1);
	worker.start();
	worker.join();
}
} //namespace duck