/*
* Copyright 2002-2015 the original author or authors.
*
* 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 org.springframework.util;
import java.util.
UUID;
import java.util.concurrent.atomic.
AtomicLong;
/**
* A simple {@link IdGenerator} that starts at 1 and increments by 1 with each call.
*
* @author Rossen Stoyanchev
* @since 4.1.5
*/
public class
SimpleIdGenerator implements
IdGenerator {
private final
AtomicLong mostSigBits = new
AtomicLong(0);
private final
AtomicLong leastSigBits = new
AtomicLong(0);
@
Override
public
UUID generateId() {
long
leastSigBits = this.
leastSigBits.
incrementAndGet();
if (
leastSigBits == 0) {
this.
mostSigBits.
incrementAndGet();
}
return new
UUID(this.
mostSigBits.
get(),
leastSigBits);
}
}