content: /*
   * 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.kafka.server;
  
  import org.apache.kafka.common.KafkaException;
  import org.apache.kafka.common.network.Selectable;
  import org.apache.kafka.common.utils.Utils;
  
  import java.io.IOException;
  import java.net.InetSocketAddress;
  import java.net.SocketException;
  import java.nio.channels.ServerSocketChannel;
  
  public interface ServerSocketFactory {
      ServerSocketFactory INSTANCE = new KafkaServerSocketFactory();
      ServerSocketChannel openServerSocket(
          String listenerName,
          InetSocketAddress socketAddress,
          int listenBacklogSize,
          int recvBufferSize
      ) throws IOException;
  
      class KafkaServerSocketFactory implements ServerSocketFactory {
  
          @Override
          public ServerSocketChannel openServerSocket(
                  String listenerName,
                  InetSocketAddress socketAddress,
                  int listenBacklogSize,
                  int recvBufferSize
          ) throws IOException {
              ServerSocketChannel socketChannel = ServerSocketChannel.open();
              try {
                  socketChannel.configureBlocking(false);
                  if (recvBufferSize != Selectable.USE_DEFAULT_BUFFER_SIZE) {
                      socketChannel.socket().setReceiveBufferSize(recvBufferSize);
                  }
                  socketChannel.socket().bind(socketAddress, listenBacklogSize);
              } catch (SocketException e) {
                  Utils.closeQuietly(socketChannel, "server socket");
                  throw new KafkaException(String.format("Socket server failed to bind to %s:%d: %s.",
                      socketAddress.getHostString(), socketAddress.getPort(), e.getMessage()), e);
              }
              return socketChannel;
          }
      }
  }
  