drogon/examples/simple_example/PipeliningTest.cc

#include "PipeliningTest.h"
#include <trantor/net/EventLoop.h>
#include <atomic>

void PipeliningTest::asyncHandleHttpRequest(const HttpRequestPtr &req, std::function<void(const HttpResponsePtr &)> &&callback)
{
    static std::atomic<int> counter{0};
    int c = counter.fetch_add(1);
    double delay = ((double)(10 - (c % 10))) / 10.0;
    trantor::EventLoop::getEventLoopOfCurrentThread()->runAfter(delay, [c, callback]() {
        auto resp = HttpResponse::newHttpResponse();
        auto str = utils::formattedString("<P>the %dth response</P>", c);
        resp->addHeader("counter", utils::formattedString("%d", c));
        resp->setBody(std::move(str));
        callback(resp);
    });
}