基于雪花算法的增强版ID生成器
- 解决了时间回拨的问题
- 无需手动指定workId, 微服务环境自适应
- 可配置化
快速开始
1.依赖引入
io.github.mocreates uid-generator 2.0-RELEASE
2.配置序列器 Sequence
@Bean
public Sequence sequence() {
SequenceConfig sequenceConfig = new SimpleSequenceConfig();
return new Sequence(sequenceConfig);
}
3.使用序列器生成ID
@Autowired
private Sequence sequence;
public long generateId() {
return sequence.nextId();
}
配置解析
目前提供两个配置类
io.github.mocreates.config.DefaultSequenceConfigio.github.mocreates.config.SimpleSequenceConfig
前者需要显式地指定 workerId、datacenterId，可以结合数据库来使用，后者是利用网卡信息进行自适应
详情
| 字段名 | 释义 | 默认值 |
|---|---|---|
| twepoch | 可以被设置为最接近项目启用前的某个时间点（unix 时间戳) | 1665817757000L |
| workerIdBits | 机器位所占的bit位数 | 19L |
| datacenterIdBits | 数据标识位所占的bit位数 | 0L |
| sequenceBits | 毫秒内自增位数 | 3L |
| workerId | 机器位 | |
| datacenterId | 数据位 | 0L |
| inetAddress | 网络相关信息 |
生产推荐使用方式
1.依赖引入
io.github.mocreates uid-generator 2.0-RELEASE
2.创建表
CREATE TABLE `worker_node` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `node_info` varchar(512) NOT NULL, `gmt_create` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP, `gmt_modify` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='DB WorkerID Assigner for UID Generator';
3.配置 (利用主键自增来分配workerId, 解决分布式环境下手动指定workerId的痛点)
@Bean
public Sequence sequence(WorkerNodeMapper workerNodeMapper) throws UnknownHostException {
WorkerNode workerNode = new WorkerNode();
InetAddress localHost = InetAddress.getLocalHost();
workerNode.setNodeInfo(localHost.toString());
workerNodeMapper.insertSelective(workerNode);
DefaultSequenceConfig defaultSequenceConfig = new DefaultSequenceConfig();
defaultSequenceConfig.setWorkerId(workerNode.getId());
return new Sequence(defaultSequenceConfig);
}
4.使用序列器生成ID
@Autowired
private Sequence sequence;
public long generateId() {
return sequence.nextId();
}
JMH 性能测试
测试机硬件情况
MacBook Pro (13-inch, M1, 2020) 8C 16G
Sequence 配置参数
private static final DefaultSequenceConfig SEQUENCE_CONFIG = new DefaultSequenceConfig();
static {
SEQUENCE_CONFIG.setSequenceBits(22);
SEQUENCE_CONFIG.setWorkerIdBits(0);
SEQUENCE_CONFIG.setDatacenterIdBits(0);
SEQUENCE_CONFIG.setTwepoch(System.currentTimeMillis());
SEQUENCE_CONFIG.setWorkerId(0L);
SEQUENCE_CONFIG.setDatacenterId(0L);
}
private static final Sequence SEQUENCE = new Sequence(SEQUENCE_CONFIG);
JMH参数
@BenchmarkMode(Mode.Throughput) @Threads(10) @Warmup(iterations = 3, time = 10, timeUnit = TimeUnit.SECONDS) @Measurement(iterations = 10, time = 10, timeUnit = TimeUnit.SECONDS) @State(value = Scope.Benchmark) @Fork(1) @OutputTimeUnit(TimeUnit.SECONDS)
测试结果
| Benchmark | Mode | Cnt | Score | Error | Units |
|---|---|---|---|---|---|
| SingleNodeSequenceTest.nextIdTest | thrpt | 10 | 27825573.565 ± 962298.054 | ops/s |
Tip
如果对qps性能要求较高，可以适当调整sequenceBits
仓库地址
https://github.com/mocreates/sequence
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