[O] Reduce code

src/main/java/icu/samnyan/aqua/sega/aimedb/AimeDbServer.kt

@@ -0,0 +1,78 @@
+package icu.samnyan.aqua.sega.aimedb
+
+import io.netty.bootstrap.ServerBootstrap
+import io.netty.channel.ChannelInitializer
+import io.netty.channel.ChannelOption
+import io.netty.channel.nio.NioEventLoopGroup
+import io.netty.channel.socket.SocketChannel
+import io.netty.channel.socket.nio.NioServerSocketChannel
+import io.netty.handler.logging.LogLevel
+import io.netty.handler.logging.LoggingHandler
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
+import org.springframework.beans.factory.config.BeanDefinition
+import org.springframework.boot.context.properties.ConfigurationProperties
+import org.springframework.context.annotation.Configuration
+import org.springframework.context.annotation.Scope
+import org.springframework.stereotype.Component
+import java.net.InetAddress
+import java.net.InetSocketAddress
+import java.net.UnknownHostException
+
+@Configuration
+@ConfigurationProperties(prefix = "aimedb.server")
+class AimeDbProps {
+    var enable = true
+    var address = "0.0.0.0"
+    var port = 22345
+}
+
+/**
+ * @author samnyan (privateamusement@protonmail.com)
+ */
+@Component
+class AimeDbServer(
+    val initializer: AimeDbServerInitializer,
+    val props: AimeDbProps
+) {
+    val logger: Logger = LoggerFactory.getLogger(AimeDbServer::class.java)
+
+    fun start() {
+        if (!props.enable) return logger.info("Aime DB is disabled.")
+
+        val bootstrap = ServerBootstrap()
+            .group(NioEventLoopGroup(), NioEventLoopGroup())
+            .handler(LoggingHandler(LogLevel.DEBUG))
+            .channel(NioServerSocketChannel::class.java)
+            .childHandler(initializer)
+            .option(ChannelOption.SO_BACKLOG, 128)
+
+        if (props.address.isBlank()) props.address = "0.0.0.0"
+
+        try {
+            val socket = InetSocketAddress(InetAddress.getByName(props.address), props.port)
+
+            val f = bootstrap.bind(socket).sync()
+            logger.info("Aime DB start up on  $socket")
+            f.channel().closeFuture()
+        }
+        catch (e: UnknownHostException) {
+            logger.error("UnknownHostException, please check you have set a correct aimedb.server.address.")
+            throw e
+        }
+    }
+}
+
+@Component
+@Scope(BeanDefinition.SCOPE_PROTOTYPE)
+class AimeDbServerInitializer(
+    val aimeDbRequestHandler: AimeDbRequestHandler
+) : ChannelInitializer<SocketChannel>() {
+    override fun initChannel(ch: SocketChannel) {
+        ch.pipeline().apply {
+            addLast("encoder", AimeDbEncoder())
+            addLast("decoder", AimeDbDecoder())
+            addLast("handler", aimeDbRequestHandler)
+        }
+    }
+}