content: /*
   * Tencent is pleased to support the open source community by making Angel available.
   *
   * Copyright (C) 2017-2018 THL A29 Limited, a Tencent company. All rights reserved.
   *
   * Licensed 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://opensource.org/licenses/Apache-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 com.tencent.angel.ipc;
  
  import java.io.IOException;
  
  /**
   * Superclass of all protocols that use Hadoop RPC. Subclasses of this interface are also supposed
   * to have a static final long versionID field.
   */
  public interface VersionedProtocol {
  
    /**
     * Return protocol version corresponding to protocol interface.
     *
     * @param protocol      The classname of the protocol interface
     * @param clientVersion The version of the protocol that the client speaks
     * @return the version that the server will speak
     * @throws java.io.IOException if any IO error occurs
     */
    public long getProtocolVersion(String protocol, long clientVersion) throws IOException;
  }
  