import org.apache.hadoop.ipc.RPC.Server.VerProtocolImpl; //导入依赖的package包/类
private long[] getProtocolVersionForRpcKind(RPC.RpcKind rpcKind,
    String protocol) throws ClassNotFoundException {
  Class<?> protocolClass = Class.forName(protocol);
  String protocolName = RPC.getProtocolName(protocolClass);
  VerProtocolImpl[] vers = server.getSupportedProtocolVersions(rpcKind,
      protocolName);
  if (vers == null) {
    return null;
  }
  long [] versions = new long[vers.length];
  for (int i=0; i<versions.length; i++) {
    versions[i] = vers[i].version;
  }
  return versions;
}