import org.apache.hadoop.yarn.api.ApplicationHistoryProtocolPB; //导入依赖的package包/类
@Override
public KerberosInfo getKerberosInfo(Class<?> protocol, Configuration conf) {
  if (!protocol
      .equals(ApplicationHistoryProtocolPB.class)) {
    return null;
  }
  return new KerberosInfo() {

    @Override
    public Class<? extends Annotation> annotationType() {
      return null;
    }

    @Override
    public String serverPrincipal() {
      return YarnConfiguration.TIMELINE_SERVICE_PRINCIPAL;
    }

    @Override
    public String clientPrincipal() {
      return null;
    }
  };
}
 

import org.apache.hadoop.yarn.api.ApplicationHistoryProtocolPB; //导入依赖的package包/类
@Override
public TokenInfo getTokenInfo(Class<?> protocol, Configuration conf) {
  if (!protocol
      .equals(ApplicationHistoryProtocolPB.class)) {
    return null;
  }
  return new TokenInfo() {

    @Override
    public Class<? extends Annotation> annotationType() {
      return null;
    }

    @Override
    public Class<? extends TokenSelector<? extends TokenIdentifier>>
        value() {
      return TimelineDelegationTokenSelector.class;
    }
  };
}
 

import org.apache.hadoop.yarn.api.ApplicationHistoryProtocolPB; //导入依赖的package包/类
public ApplicationHistoryProtocolPBClientImpl(long clientVersion,
    InetSocketAddress addr, Configuration conf) throws IOException {
  RPC.setProtocolEngine(conf, ApplicationHistoryProtocolPB.class,
    ProtobufRpcEngine.class);
  proxy =
      RPC.getProxy(ApplicationHistoryProtocolPB.class, clientVersion, addr,
        conf);
}
 

import org.apache.hadoop.yarn.api.ApplicationHistoryProtocolPB; //导入依赖的package包/类
@Override
public Service[] getServices() {
  return new Service[] {
      new Service(
          YarnConfiguration.YARN_SECURITY_SERVICE_AUTHORIZATION_APPLICATIONHISTORY_PROTOCOL,
          ApplicationHistoryProtocolPB.class)
  };
}