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 com.aliyun.odps.graph;
  
  import java.io.IOException;
  
  import com.aliyun.odps.io.Writable;
  
  /**
   * MasterComputer接口允许 Master在 作业启动时，每轮迭代开始前，作业结束时执行用户代码逻辑。
   * 该接口暂时不对用户开放
   *
   * @param <ComputeValue>
   *     Master上的compute value数据类型
   */
  @Deprecated
  public class MasterComputer<ComputeValue extends Writable> {
  
    /**
     * 该方法会在第一次迭代开始前调用
     *
     * @param context
     *     Master的上下文信息，并且可以通过context执行控制job运行停止状态，输出记录的操作
     * @param values
     *     Master上compute value集合迭代器，其中每个compute value对应一个worker上的compute value
     * @throws IOException
     */
    public void setup(MasterContext<ComputeValue> context,
                      Iterable<ComputeValue> values) throws IOException {
    }
  
    /**
     * 该方法会在每轮迭代开始前调用.
     *
     * @param context
     *     Master的上下文信息，并且可以通过context执行控制job运行停止状态，输出记录的操作
     * @param values
     *     Master上compute value集合迭代器，其中每个compute value对应一个worker上的compute value
     * @throws IOException
     */
    public void compute(MasterContext<ComputeValue> context,
                        Iterable<ComputeValue> values) throws IOException {
    }
  
    /**
     * 该方法会在最后一次迭代结束后调用.
     *
     * @param context
     *     Master的上下文信息，并且可以通过context执行控制job运行停止状态，输出记录的操作
     * @param values
     *     Master上compute value集合迭代器，其中每个compute value对应一个worker上的compute value
     * @throws IOException
     */
    public void cleanup(MasterContext<ComputeValue> context,
                        Iterable<ComputeValue> values) throws IOException {
    }
  }
  