hadoop ID 源码

  • 2022-10-20
  • 浏览 (119)

haddop ID 代码

文件路径:/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/ID.java

/**
 * 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 org.apache.hadoop.mapreduce;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.io.WritableComparable;

/**
 * A general identifier, which internally stores the id
 * as an integer. This is the super class of {@link JobID}, 
 * {@link TaskID} and {@link TaskAttemptID}.
 * 
 * @see JobID
 * @see TaskID
 * @see TaskAttemptID
 */
@InterfaceAudience.Public
@InterfaceStability.Stable
public abstract class ID implements WritableComparable<ID> {
  protected static final char SEPARATOR = '_';
  protected int id;

  /** constructs an ID object from the given int */
  public ID(int id) {
    this.id = id;
  }

  protected ID() {
  }

  /** returns the int which represents the identifier */
  public int getId() {
    return id;
  }

  @Override
  public String toString() {
    return String.valueOf(id);
  }

  @Override
  public int hashCode() {
    return id;
  }

  @Override
  public boolean equals(Object o) {
    if (this == o)
      return true;
    if(o == null)
      return false;
    if (o.getClass() == this.getClass()) {
      ID that = (ID) o;
      return this.id == that.id;
    }
    else
      return false;
  }

  /** Compare IDs by associated numbers */
  public int compareTo(ID that) {
    return this.id - that.id;
  }

  public void readFields(DataInput in) throws IOException {
    this.id = in.readInt();
  }

  public void write(DataOutput out) throws IOException {
    out.writeInt(id);
  }
  
}

相关信息

hadoop 源码目录

相关文章

hadoop Cluster 源码

hadoop ClusterMetrics 源码

hadoop ContextFactory 源码

hadoop Counter 源码

hadoop CounterGroup 源码

hadoop Counters 源码

hadoop CryptoUtils 源码

hadoop CustomJobEndNotifier 源码

hadoop FileSystemCounter 源码

hadoop InputFormat 源码

0  赞