hadoop ID 源码
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);
}
}
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