hadoop JobId 源码
haddop JobId 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-mawo/hadoop-yarn-applications-mawo-core/src/main/java/org/apache/hadoop/applications/mawo/server/master/job/JobId.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.applications.mawo.server.master.job;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.Random;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableUtils;
/**
* Define MaWo JobId.
*/
public class JobId implements Writable {
/**
* MaWo job prefix.
*/
private static final String JOB_PREFIX = "mawo_job_";
/**
* Create unique random JobId.
* @return unique random JobId
*/
static JobId newJobId() {
Random rn = new Random();
final int range = 900000;
final int randomadd = 100000;
int randomNum = rn.nextInt(range) + randomadd;
return new JobId(randomNum);
}
/**
* Unique Id.
*/
private int jobIdentifier;
/**
* JobId default constructor.
*/
public JobId() {
}
/**
* JobId constructor with Id.
* @param id : unique id
*/
public JobId(final int id) {
this.jobIdentifier = id;
}
/**
* Get JobId.
* @return unique ID
*/
public final int getID() {
return jobIdentifier;
}
/**
* Print JobId.
* @return JobId
*/
public final String toString() {
return JOB_PREFIX + jobIdentifier;
}
@Override
/**
* Hashcode for jobId.
*/
public final int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + jobIdentifier;
return result;
}
@Override
/**
* Implement equals method for jobId.
*/
public final boolean equals(final Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
JobId other = (JobId) obj;
if (jobIdentifier != other.jobIdentifier) {
return false;
}
return true;
}
/** {@inheritDoc} */
public final void write(final DataOutput out) throws IOException {
WritableUtils.writeVInt(out, jobIdentifier);
}
/** {@inheritDoc} */
public final void readFields(final DataInput in) throws IOException {
this.jobIdentifier = WritableUtils.readVInt(in);
}
}
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