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.celeborn.common.network.server;
  
  import io.netty.channel.Channel;
  
  /**
   * A bootstrap which is executed on a TransportServer's client channel once a client connects to the
   * server. This allows customizing the client channel to allow for things such as SASL
   * authentication.
   */
  public interface TransportServerBootstrap {
    /**
     * Customizes the channel to include new features, if needed.
     *
     * @param channel The connected channel opened by the client.
     * @param baseMessageHandler The RPC handler for the server.
     * @return The base message handler to use for the channel.
     */
    BaseMessageHandler doBootstrap(Channel channel, BaseMessageHandler baseMessageHandler);
  }
  