001/* 002 * Copyright 2002-2020 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.util; 018 019import java.util.UUID; 020import java.util.concurrent.atomic.AtomicLong; 021 022/** 023 * A simple {@link IdGenerator} that starts at 1, increments up to 024 * {@link Long#MAX_VALUE}, and then rolls over. 025 * 026 * @author Rossen Stoyanchev 027 * @since 4.1.5 028 */ 029public class SimpleIdGenerator implements IdGenerator { 030 031 private final AtomicLong leastSigBits = new AtomicLong(0); 032 033 034 @Override 035 public UUID generateId() { 036 return new UUID(0, this.leastSigBits.incrementAndGet()); 037 } 038 039}