org.apache.flink.runtime.jobmaster.JobMasterId Maven / Gradle / Ivy
/*
* 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.flink.runtime.jobmaster;
import org.apache.flink.util.AbstractID;
import javax.annotation.Nullable;
import java.util.UUID;
/**
* The {@link JobMaster} fencing token.
*/
public class JobMasterId extends AbstractID {
private static final long serialVersionUID = -933276753644003754L;
/**
* Creates a JobMasterId that takes the bits from the given UUID.
*/
public JobMasterId(UUID uuid) {
super(uuid.getLeastSignificantBits(), uuid.getMostSignificantBits());
}
/**
* Generates a new random JobMasterId.
*/
private JobMasterId() {
super();
}
/**
* Creates a UUID with the bits from this JobMasterId.
*/
public UUID toUUID() {
return new UUID(getUpperPart(), getLowerPart());
}
/**
* Generates a new random JobMasterId.
*/
public static JobMasterId generate() {
return new JobMasterId();
}
/**
* If the given uuid is null, this returns null, otherwise a JobMasterId that
* corresponds to the UUID, via {@link #JobMasterId(UUID)}.
*/
public static JobMasterId fromUuidOrNull(@Nullable UUID uuid) {
return uuid == null ? null : new JobMasterId(uuid);
}
}