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.mapred;
  
  import java.text.NumberFormat;
  
  /**
   * {@link Mapper} 或 {@link Reducer} 在运行时会分成多个Task并发执行，TaskID是Task的唯一标识.
   *
   * <p>
   * TaskID格式为：StageId_InstanceId，例如： <br/>
   * M1_Stg1_00000， 其中：<br/>
   * <ul>
   * <li>Stage Id：M1_Stg1<br/>
   * <li>Instance Id： Instance序号，从0计起，格式化为六位，不足前面添0<br/>
   * </ul>
   *
   * </p>
   */
  public class TaskId {
  
    protected static final char SEPARATOR = '_';
  
    protected static final NumberFormat taskidFormat = NumberFormat.getInstance();
  
    private String taskId;
  
    private int instId;
  
    static {
      taskidFormat.setGroupingUsed(false);
      taskidFormat.setMinimumIntegerDigits(6);
    }
  
    /**
     * 构造TaskID
     *
     * @param taskId
     *     Task的唯一标识
     * @param instId
     *     Instance序号，从0计起
     */
    public TaskId(String taskId, int instId) {
      super();
      this.taskId = taskId;
      this.instId = instId;
    }
  
    /**
     * 是否map
     *
     * @return 是否map
     */
    public boolean isMap() {
      return taskId.toUpperCase().charAt(0) == 'M';
    }
  
    /**
     * 获取Task序号
     *
     * @return Task序号
     */
    public String getTaskId() {
      return taskId;
    }
  
    /**
     * 获取Instance序号
     *
     * @return Instance序号
     */
    public int getInstId() {
      return instId;
    }
  
    @Override
    public String toString() {
      StringBuilder builder = new StringBuilder();
      builder.append(taskId);
      builder.append("_" + taskidFormat.format(instId));
      return builder.toString();
    }
  
  }
  