| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.flink.streaming.connectors.netty.example |
| |
| import java.net.InetSocketAddress |
| import java.util.concurrent.atomic.AtomicBoolean |
| |
| import io.netty.bootstrap.ServerBootstrap |
| import io.netty.channel.nio.NioEventLoopGroup |
| import io.netty.channel.socket.SocketChannel |
| import io.netty.channel.socket.nio.NioServerSocketChannel |
| import io.netty.channel.{ChannelFuture, ChannelInitializer, ChannelOption, ChannelPipeline} |
| import io.netty.handler.codec.string.{StringDecoder, StringEncoder} |
| import io.netty.handler.codec.{DelimiterBasedFrameDecoder, Delimiters} |
| import io.netty.handler.logging.{LogLevel, LoggingHandler} |
| import org.apache.flink.streaming.api.functions.source.SourceFunction.SourceContext |
| import org.slf4j.LoggerFactory |
| |
| /** |
| * Netty Server bootstrap with user-provided tcp port. |
| * - Receiving streaming data |
| * - add to Flink [[org.apache.flink.hadoop.shaded.org.jboss.netty.channel.ChannelHandlerContext]] |
| * |
| * @param tryPort port start to retry |
| * @param ctx flink stream collect data from netty |
| * @param tcpOpts tcp option for netty server |
| * @param threadNum thread number for netty, default is current machine processor number |
| * @param maxFrameLen max netty frame length |
| * @param logLevel netty log level |
| */ |
| class TcpServer( |
| tryPort: Int, |
| ctx: SourceContext[String], |
| tcpOpts: ServerBootstrap => Unit, |
| threadNum: Int = Runtime.getRuntime.availableProcessors(), |
| maxFrameLen: Int = 8192, |
| logLevel: LogLevel = LogLevel.INFO |
| ) extends ServerTrait { |
| |
| private lazy val logger = LoggerFactory.getLogger(getClass) |
| private lazy val bossGroup = new NioEventLoopGroup(threadNum) |
| private lazy val workerGroup = new NioEventLoopGroup |
| private lazy val isRunning = new AtomicBoolean(false) |
| |
| private var currentAddr: InetSocketAddress = _ |
| |
| def startNettyServer( |
| portNotInUse: Int, |
| callbackUrl: Option[String] |
| ): InetSocketAddress = synchronized { |
| if (!isRunning.get()) { |
| |
| val server = new ServerBootstrap |
| val bootstrap: ServerBootstrap = server |
| .group(bossGroup, workerGroup) |
| .channel(classOf[NioServerSocketChannel]) |
| .option[java.lang.Boolean](ChannelOption.TCP_NODELAY, true) |
| .option[java.lang.Boolean](ChannelOption.SO_KEEPALIVE, true) |
| |
| tcpOpts(bootstrap) |
| |
| val bootWithHandler = bootstrap |
| .handler(new LoggingHandler(logLevel)) |
| .childHandler(new ChannelInitializer[SocketChannel]() { |
| def initChannel(ch: SocketChannel) { |
| val p: ChannelPipeline = ch.pipeline |
| p.addLast(new DelimiterBasedFrameDecoder(maxFrameLen, Delimiters.lineDelimiter(): _*)) |
| p.addLast(new StringEncoder()) |
| p.addLast(new StringDecoder()) |
| p.addLast(new TcpHandler(ctx)) |
| } |
| }) |
| |
| // Start the server. |
| val f: ChannelFuture = bootWithHandler.bind(portNotInUse) |
| f.syncUninterruptibly() |
| currentAddr = f.channel().localAddress().asInstanceOf[InetSocketAddress] |
| logger.info(s"start tcp server on address: $currentAddr") |
| isRunning.set(true) |
| register(currentAddr, callbackUrl) |
| f.channel().closeFuture().sync() |
| currentAddr |
| } else { |
| logger.info(s"server is running on address: $currentAddr, no need repeat start it") |
| currentAddr |
| } |
| } |
| |
| override def close(): Unit = { |
| bossGroup.shutdownGracefully() |
| workerGroup.shutdownGracefully() |
| logger.info("successfully close netty server source") |
| } |
| } |
| |
| object TcpServer { |
| |
| def apply( |
| tryPort: Int, |
| ctx: SourceContext[String], |
| threadNum: Int = Runtime.getRuntime.availableProcessors(), |
| maxFrameLen: Int = 8192, |
| logLevel: LogLevel = LogLevel.INFO |
| ): TcpServer = { |
| val tcpOptions = (bootstrap: ServerBootstrap) => {} |
| new TcpServer(tryPort, ctx, tcpOptions, threadNum, maxFrameLen, logLevel) |
| } |
| } |