dummy server

build.gradle

@@ -38,6 +38,11 @@ dependencies {
 
     implementation libs.dagger2.implementation
     annotationProcessor libs.dagger2.annotationProcessor
+
+    implementation platform('io.projectreactor:reactor-bom:2020.0.6')
+    implementation 'io.projectreactor:reactor-core'
+
+    implementation 'io.netty:netty-all:4.1.22.Final'
 }
 
 application.mainClassName = 'mc.server.Main'

src/main/java/mc/server/Main.java

@@ -1,11 +1,18 @@
 package mc.server;
 
 import lombok.extern.slf4j.Slf4j;
+import mc.server.di.DaggerNetworkComponent;
+import mc.server.di.NetworkComponent;
+import mc.server.network.Server;
 
 @Slf4j
 public class Main {
 
 	public static void main(String[] args) {
 		log.info("hello");
+
+		NetworkComponent networkComponent = DaggerNetworkComponent.create();
+		Server server = networkComponent.getServer();
+		server.start("127.0.0.1", 25565);
 	}
 }

src/main/java/mc/server/di/NetworkComponent.java

@@ -0,0 +1,10 @@
+package mc.server.di;
+
+import dagger.Component;
+import mc.server.network.Server;
+
+@Component(modules = NetworkModule.class)
+public interface NetworkComponent {
+
+	Server getServer();
+}

src/main/java/mc/server/di/NetworkModule.java

@@ -0,0 +1,71 @@
+package mc.server.di;
+
+import dagger.Module;
+import dagger.Provides;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.channel.ChannelHandler;
+import io.netty.channel.ChannelInitializer;
+import io.netty.channel.ChannelPipeline;
+import io.netty.channel.EventLoopGroup;
+import io.netty.channel.nio.NioEventLoopGroup;
+import io.netty.channel.socket.SocketChannel;
+import io.netty.channel.socket.nio.NioServerSocketChannel;
+import io.netty.handler.logging.LoggingHandler;
+import mc.server.network.Server;
+import mc.server.network.netty.NettyServer;
+
+import javax.inject.Named;
+import java.util.Collections;
+import java.util.List;
+
+@Module
+public class NetworkModule {
+
+	@Provides
+	Server provideServer(ServerBootstrap serverBootstrap) {
+		return new NettyServer(serverBootstrap);
+	}
+
+	@Provides
+	ServerBootstrap provideServerBootstrap(
+			@Named("boss-group") EventLoopGroup bossGroup,
+			@Named("worker-group") EventLoopGroup workerGroup,
+			ChannelInitializer<SocketChannel> channelChannelInitializer
+	) {
+		ServerBootstrap bootstrap = new ServerBootstrap();
+
+		bootstrap.group(bossGroup, workerGroup)
+				.channel(NioServerSocketChannel.class)
+				.childHandler(channelChannelInitializer);
+
+		return bootstrap;
+	}
+
+	@Provides
+	@Named("boss-group")
+	EventLoopGroup provideBossGroup() {
+		return new NioEventLoopGroup(1);
+	}
+
+	@Provides
+	@Named("worker-group")
+	EventLoopGroup provideWorkerGroup() {
+		return new NioEventLoopGroup();
+	}
+
+	@Provides
+	ChannelInitializer<SocketChannel> provideChannelChannelInitializer(List<ChannelHandler> channelHandlerList) {
+		return new ChannelInitializer<>() {
+			@Override
+			protected void initChannel(SocketChannel socketChannel) {
+				final ChannelPipeline pipeline = socketChannel.pipeline();
+				channelHandlerList.forEach(pipeline::addLast);
+			}
+		};
+	}
+
+	@Provides
+	List<ChannelHandler> provideChannelHandlerList() {
+		return Collections.singletonList(new LoggingHandler());
+	}
+}

src/main/java/mc/server/network/Server.java

@@ -0,0 +1,6 @@
+package mc.server.network;
+
+public interface Server {
+
+	void start(String host, int port);
+}

src/main/java/mc/server/network/netty/NettyServer.java

@@ -0,0 +1,27 @@
+package mc.server.network.netty;
+
+import io.netty.bootstrap.ServerBootstrap;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import mc.server.network.Server;
+
+@Slf4j
+@RequiredArgsConstructor
+public class NettyServer implements Server {
+
+	private final ServerBootstrap serverBootstrap;
+
+	@Override
+	public void start(String host, int port) {
+		log.info("Network starting: {}:{}", host, port);
+
+		try {
+			serverBootstrap.bind(host, port)
+					.sync().channel().closeFuture().sync();
+		} catch (InterruptedException e) {
+			if (log.isTraceEnabled()) {
+				log.trace("{}: {}", e.getClass().getSimpleName(), e.getMessage(), e);
+			}
+		}
+	}
+}