org.apache.openjpa.kernel.TimeSeededSeq 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.openjpa.kernel;
import org.apache.openjpa.meta.ClassMetaData;
////////////////////////////////////////////////////////////
// NOTE: Do not change property names; see SequenceMetaData
// for standard property names.
////////////////////////////////////////////////////////////
/**
* A simplistic implementation of a {@link Seq} used
* to provide datastore ids. Starts with an id equal to the system's
* current time in milliseconds and increments from there.
*
* @author Greg Campbell
*/
public class TimeSeededSeq
implements Seq {
private long _id = System.currentTimeMillis();
private int _increment = 1;
public void setType(int type) {
}
public int getIncrement() {
return _increment;
}
public void setIncrement(int increment) {
_increment = increment;
}
public synchronized Object next(StoreContext ctx, ClassMetaData meta) {
_id += _increment;
return _id;
}
public synchronized Object current(StoreContext ctx, ClassMetaData meta) {
return _id;
}
public void allocate(int additional, StoreContext ctx, ClassMetaData meta) {
}
public void close() {
}
}