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   /*
    * Copyright 2016 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.channel.kqueue;
  
  import io.netty.channel.Channel;
  import io.netty.channel.EventLoop;
  import io.netty.channel.socket.ServerSocketChannel;
  import io.netty.util.internal.UnstableApi;
  
  import java.net.InetSocketAddress;
  import java.net.SocketAddress;
  
  import static io.netty.channel.kqueue.BsdSocket.newSocketStream;
  import static io.netty.channel.unix.NativeInetAddress.address;
  
  @UnstableApi
  public final class KQueueServerSocketChannel extends AbstractKQueueServerChannel implements ServerSocketChannel {
      private final KQueueServerSocketChannelConfig config;
  
      public KQueueServerSocketChannel() {
          super(newSocketStream(), false);
          config = new KQueueServerSocketChannelConfig(this);
      }
  
      public KQueueServerSocketChannel(int fd) {
          // Must call this constructor to ensure this object's local address is configured correctly.
          // The local address can only be obtained from a Socket object.
          this(new BsdSocket(fd));
      }
  
      KQueueServerSocketChannel(BsdSocket fd) {
          super(fd);
          config = new KQueueServerSocketChannelConfig(this);
      }
  
      KQueueServerSocketChannel(BsdSocket fd, boolean active) {
          super(fd, active);
          config = new KQueueServerSocketChannelConfig(this);
      }
  
      @Override
      protected boolean isCompatible(EventLoop loop) {
          return loop instanceof KQueueEventLoop;
      }
  
      @Override
      protected void doBind(SocketAddress localAddress) throws Exception {
          super.doBind(localAddress);
          socket.listen(config.getBacklog());
          if (config.isTcpFastOpen()) {
              socket.setTcpFastOpen(true);
          }
          active = true;
      }
  
      @Override
      public InetSocketAddress remoteAddress() {
          return (InetSocketAddress) super.remoteAddress();
      }
  
      @Override
      public InetSocketAddress localAddress() {
          return (InetSocketAddress) super.localAddress();
      }
  
      @Override
      public KQueueServerSocketChannelConfig config() {
          return config;
      }
  
      @Override
      protected Channel newChildChannel(int fd, byte[] address, int offset, int len) throws Exception {
          return new KQueueSocketChannel(this, new BsdSocket(fd), address(address, offset, len));
      }
  }