Cora Iberkleid's Awesome Virtual Threads Demo

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.client.RestClient;

import java.util.Map;


// test with
// hey -n 60 -c 20 http://localhost:8080/go
@Controller
@ResponseBody
@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        Map.of("spring.threads.virtual.enabled", Boolean.toString(true),
                        "server.tomcat.threads.max", Integer.toString(16))
                .forEach(System::setProperty);
        SpringApplication.run(DemoApplication.class, args);
    }

    private final RestClient restClient;

    DemoApplication(RestClient.Builder b) {
        this.restClient = b.build();
    }

    @GetMapping("/go")
    String go() {
        return restClient
                .get()
                .uri("https://httpbin.org/delay/4")
                .retrieve()
                .body(String.class);
    }

}