/*
* Copyright [2014] [Christian Loehnert, krampenschiesser@gmail.com]
* Licensed 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 de.ks.persistence.entity;
import de.ks.persistence.PersistentWork;
import de.ks.persistence.Retry;
import javax.persistence.Entity;
@Entity
public class Sequence extends NamedPersistentObject<Sequence> {
protected long seqNr;
public Sequence() {
//
}
public Sequence(String name) {
super(name);
}
public long incrementAndGet() {
return ++seqNr;
}
public long getSeqNr() {
return seqNr;
}
public void setSeqNr(long seqNr) {
this.seqNr = seqNr;
}
public static long getNextSequenceNr(String seqName) {
return new Retry().retry(() -> PersistentWork.read(em -> {
Sequence sequence = PersistentWork.forName(Sequence.class, seqName);
if (sequence == null) {
sequence = new Sequence(seqName);
em.persist(sequence);
}
return sequence.incrementAndGet();
}));
}
}