Project Name

Spring Boot 3 -HAProxy-Prometheus-Grafana-Java 21 ( Virtual Thread and Platform Thread and String Template )

Tech Stack

• Java 21
• Spring Boot 3
• HAProxy
• Prometheus
• Grafana
• Docker Compose

Installation

docker-compose up -d

Medium

Read the full article on Medium

HAProxy UI

Service Call Count in Grafana

• haproxy.cfg

global
    maxconn     4000

defaults
    mode http
    timeout connect 5000
    timeout client 50000
    timeout server 50000

frontend stats
    bind *:4444
    mode http
    stats uri /
    stats show-legends
    stats enable
    stats auth tugay:tugay

frontend backend_service_listen
    bind *:1905
    default_backend backend_service

backend backend_service
    mode http
    option httpclose
    balance roundrobin
    server virtual-thread host.docker.internal:8091 check port 8091
    server platform-thread host.docker.internal:8090 check port 8090

• Java 21 String Templates

	var threadName = Thread.currentThread().toString();

        var response = STR."""
                {
                   "thradName" :\{threadName}
                   "port" : "8091"
                   "applicationName" : "virtual-thread"
                }
                """;

• Enable Virtual thread in Spring Boot Configuration

	@Bean
	TomcatProtocolHandlerCustomizer<?> protocolHandlerVirtualThreadExecutorCustomizer() {
		return protocolHandler -> {
			protocolHandler.setExecutor(Executors.newVirtualThreadPerTaskExecutor());
		};
	}

Apache Benchmark provides various options to control the benchmarking process.

Examples

Perform 100 requests to a website with a concurrency of 100:

# Platform Thread
ab -n 100 -c 100 http://localhost:1905/v1/api