TCP Server

import reactor.netty.DisposableServer;
import reactor.netty.tcp.TcpServer;

public class Application {

	public static void main(String[] args) {
		DisposableServer server =
				TcpServer.create()
				         .host("localhost") (1)
				         .port(8080)        (2)
				         .bindNow();

		server.onDispose()
		      .block();
	}
}

import reactor.core.publisher.Mono;
import reactor.netty.DisposableServer;
import reactor.netty.tcp.TcpServer;

public class MultiAddressApplication {

	public static void main(String[] args) {
		TcpServer tcpServer = TcpServer.create();
		DisposableServer server1 = tcpServer
				.host("localhost") (1)
				.port(8080)        (2)
				.bindNow();

		DisposableServer server2 = tcpServer
				.host("0.0.0.0") (3)
				.port(8081)      (4)
				.bindNow();

		Mono.when(server1.onDispose(), server2.onDispose())
				.block();
	}
}

	TcpServerBind() {
		Map<ChannelOption<?>, Boolean> childOptions = new HashMap<>(MapUtils.calculateInitialCapacity(2));
		childOptions.put(ChannelOption.AUTO_READ, false);
		childOptions.put(ChannelOption.TCP_NODELAY, true);
		this.config = new TcpServerConfig(
				Collections.singletonMap(ChannelOption.SO_REUSEADDR, true),
				childOptions,
				() -> new InetSocketAddress(DEFAULT_PORT));
	}

import io.netty.channel.ChannelOption;
import reactor.netty.DisposableServer;
import reactor.netty.tcp.TcpServer;

public class Application {

	public static void main(String[] args) {
		DisposableServer server =
				TcpServer.create()
				         .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10000)
				         .bindNow();

		server.onDispose()
		      .block();
	}
}

import reactor.netty.DisposableServer;
import reactor.netty.tcp.TcpServer;

public class Application {

	public static void main(String[] args) {
		DisposableServer server =
				TcpServer.create()
				         .wiretap(true) (1)
				         .bindNow();

		server.onDispose()
		      .block();
	}
}

	/**
	 * Default worker thread count, fallback to available processor
	 * (but with a minimum value of 4).
	 */
	public static final String IO_WORKER_COUNT = "reactor.netty.ioWorkerCount";
	/**
	 * Default selector thread count, fallback to -1 (no selector thread)
	 * <p><strong>Note:</strong> In most use cases using a worker thread also as a selector thread works well.
	 * A possible use case for specifying a separate selector thread might be when the worker threads are too busy
	 * and connections cannot be accepted fast enough.
	 * <p><strong>Note:</strong> Although more than 1 can be configured as a selector thread count, in reality
	 * only 1 thread will be used as a selector thread.
	 */
	public static final String IO_SELECT_COUNT = "reactor.netty.ioSelectCount";
	/**
	 * Default worker thread count for UDP, fallback to available processor
	 * (but with a minimum value of 4).
	 */
	public static final String UDP_IO_THREAD_COUNT = "reactor.netty.udp.ioThreadCount";
	/**
	 * Default quiet period that guarantees that the disposal of the underlying LoopResources
	 * will not happen, fallback to 2 seconds.
	 */
	public static final String SHUTDOWN_QUIET_PERIOD = "reactor.netty.ioShutdownQuietPeriod";
	/**
	 * Default maximum amount of time to wait until the disposal of the underlying LoopResources
	 * regardless if a task was submitted during the quiet period, fallback to 15 seconds.
	 */
	public static final String SHUTDOWN_TIMEOUT = "reactor.netty.ioShutdownTimeout";

	/**
	 * Default value whether the native transport (epoll, kqueue) will be preferred,
	 * fallback it will be preferred when available.
	 */

import reactor.netty.DisposableServer;
import reactor.netty.resources.LoopResources;
import reactor.netty.tcp.TcpServer;

public class Application {

	public static void main(String[] args) {
		LoopResources loop = LoopResources.create("event-loop", 1, 4, true);

		DisposableServer server =
				TcpServer.create()
				         .runOn(loop)
				         .bindNow();

		server.onDispose()
		      .block();
	}
}

import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.SslContextBuilder;
import reactor.netty.DisposableServer;
import reactor.netty.tcp.TcpServer;

import java.io.File;

public class Application {

	public static void main(String[] args) throws Exception {
		File defaultCert = new File("default_certificate.crt");
		File defaultKey = new File("default_private.key");

		File testDomainCert = new File("default_certificate.crt");
		File testDomainKey = new File("default_private.key");

		SslContext defaultSslContext = SslContextBuilder.forServer(defaultCert, defaultKey).build();
		SslContext testDomainSslContext = SslContextBuilder.forServer(testDomainCert, testDomainKey).build();

		DisposableServer server =
				TcpServer.create()
				         .secure(spec -> spec.sslContext(defaultSslContext)
				                             .addSniMapping("*.test.com",
				                                     testDomainSpec -> testDomainSpec.sslContext(testDomainSslContext)))
				         .bindNow();

		server.onDispose()
		      .block();
	}
}

import brave.Tracing;
import brave.propagation.StrictCurrentTraceContext;
import brave.sampler.Sampler;
import io.micrometer.context.ContextSnapshot;
import io.micrometer.context.ContextSnapshotFactory;
import io.micrometer.tracing.CurrentTraceContext;
import io.micrometer.tracing.Tracer;
import io.micrometer.tracing.brave.bridge.BraveBaggageManager;
import io.micrometer.tracing.brave.bridge.BraveCurrentTraceContext;
import io.micrometer.tracing.brave.bridge.BraveTracer;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import reactor.core.publisher.Mono;
import reactor.netty.DisposableServer;
import reactor.netty.NettyPipeline;
import reactor.netty.observability.ReactorNettyTracingObservationHandler;
import reactor.netty.tcp.TcpServer;
import reactor.netty.tcp.TcpSslContextSpec;
import zipkin2.reporter.brave.AsyncZipkinSpanHandler;
import zipkin2.reporter.urlconnection.URLConnectionSender;

import java.io.File;

import static reactor.netty.Metrics.OBSERVATION_REGISTRY;

public class Application {

	public static void main(String[] args) {
		init(); (1)

		File cert = new File("certificate.crt");
		File key = new File("private.key");

		TcpSslContextSpec tcpSslContextSpec = TcpSslContextSpec.forServer(cert, key);

		DisposableServer server =
				TcpServer.create()
				         .metrics(true) (2)
				         .doOnChannelInit((observer, channel, address) -> channel.pipeline().addAfter(
				                 NettyPipeline.SslHandler, "custom-channel-handler", CustomChannelInboundHandler.INSTANCE)) (3)
				         .secure(spec -> spec.sslContext(tcpSslContextSpec))
				         .handle((inbound, outbound) -> outbound.sendString(Mono.just("hello")))
				         .bindNow();

		server.onDispose()
		      .block();
	}

	static final class CustomChannelInboundHandler extends ChannelInboundHandlerAdapter {

		static final ChannelHandler INSTANCE = new CustomChannelInboundHandler();

		@Override
		public void channelActive(ChannelHandlerContext ctx) {
			try (ContextSnapshot.Scope scope = ContextSnapshotFactory.builder().build().setThreadLocalsFrom(ctx.channel())) {
				System.out.println("Current Observation in Scope: " + OBSERVATION_REGISTRY.getCurrentObservation());
				ctx.fireChannelActive();
			}
			System.out.println("Current Observation: " + OBSERVATION_REGISTRY.getCurrentObservation());
		}

		@Override
		public boolean isSharable() {
			return true;
		}
	}