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   /*
    * Copyright 2017 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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 io.netty.testsuite.http2;
  
  import io.netty.bootstrap.ServerBootstrap;
  import io.netty.channel.Channel;
  import io.netty.channel.ChannelOption;
  import io.netty.channel.EventLoopGroup;
  import io.netty.channel.nio.NioEventLoopGroup;
  import io.netty.channel.socket.nio.NioServerSocketChannel;
  import io.netty.handler.logging.LogLevel;
  import io.netty.handler.logging.LoggingHandler;
  
  /**
   * An HTTP/2 Server that responds to requests with a Hello World. Once started, you can test the
   * server with the example client.
   */
  public final class Http2Server {
  
      private final int port;
  
      Http2Server(final int port) {
          this.port = port;
      }
  
      void run() throws Exception {
          // Configure the server.
          EventLoopGroup group = new NioEventLoopGroup();
          try {
              ServerBootstrap b = new ServerBootstrap();
              b.option(ChannelOption.SO_BACKLOG, 1024);
              b.group(group)
                      .channel(NioServerSocketChannel.class)
                      .handler(new LoggingHandler(LogLevel.INFO))
                      .childHandler(new Http2ServerInitializer());
  
              Channel ch = b.bind(port).sync().channel();
  
              ch.closeFuture().sync();
          } finally {
              group.shutdownGracefully();
          }
      }
  
      public static void main(String[] args) throws Exception {
          int port;
          if (args.length > 0) {
              port = Integer.parseInt(args[0]);
          } else {
              port = 9000;
          }
          new Http2Server(port).run();
      }
  }