Spring Boot集成全局唯一ID生成器

流水号生成器（全局唯一 ID生成器）是服务化系统的基础设施，其在保障系统的正确运行和高可用方面发挥着重要作用。而关于流水号生成算法首屈一指的当属 Snowflake雪花算法，然而 Snowflake本身很难在现实项目中直接使用，因此实际应用时需要一种可落地的方案。

Snowflake仓库

https://github.com/twitter/snowflake

UidGenerator 由百度用Java语言开发的, 基于 Snowflake算法的唯一ID生成器。UidGenerator以组件形式工作在应用项目中, 支持自定义workerId位数和初始化策略, 从而适用于docker等虚拟化环境下实例自动重启、漂移等场景。

UidGenerator仓库

https://github.com/baidu/uid-generator

UidGenerator中文文档

https://github.com/baidu/uid-generator/blob/master/README.zh_cn.md

0x01：先在 pom.xml中添加相关依赖

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
<!--for Mysql-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
<version>8.0.12</version>
</dependency>
<!-- druid -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.9</version>
</dependency>
<!--必须放在最后-->
<dependency>
<groupId>cn.codesheep</groupId>
<artifactId>uid-generator</artifactId>
<version>1.0</version>
</dependency>
</dependencies>

0x02： application.properties配置文件中添加配置（主要是 MySQL和 MyBatis配置）

server.port=9999
spring.datasource.url=jdbc:mysql://xxx.xxx.xxx.xxx:3306/xxx?useUnicode=true&characterEncoding=utf-8&useSSL=false
spring.datasource.username=root
spring.datasource.password=xxx
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
mybatis.mapper-locations=classpath:mapper/*.xml
mybatis.configuration.map-underscore-to-camel-case=true

0x03：创建数据库表

运行sql脚本以导入表WORKER_NODE, 脚本如下

DROP DATABASE IF EXISTS `xxxx`;
CREATE DATABASE `xxxx` ;
use `xxxx`;
DROP TABLE IF EXISTS WORKER_NODE;
CREATE TABLE WORKER_NODE
(
ID BIGINT NOT NULL AUTO_INCREMENT COMMENT 'auto increment id',
HOST_NAME VARCHAR(64) NOT NULL COMMENT 'host name',
PORT VARCHAR(64) NOT NULL COMMENT 'port',
TYPE INT NOT NULL COMMENT 'node type: ACTUAL or CONTAINER',
LAUNCH_DATE DATE NOT NULL COMMENT 'launch date',
MODIFIED TIMESTAMP NOT NULL COMMENT 'modified time',
CREATED TIMESTAMP NOT NULL COMMENT 'created time',
PRIMARY KEY(ID)
)
COMMENT='DB WorkerID Assigner for UID Generator',ENGINE = INNODB;

0x04：Spring配置

提供了两种生成器: DefaultUidGenerator、CachedUidGenerator。如对UID生成性能有要求, 请使用CachedUidGenerator

对应Spring配置分别为: default-uid-spring.xml、cached-uid-spring.xml

DefaultUidGenerator配置

<!-- DefaultUidGenerator -->
<bean />

CachedUidGenerator配置

<!-- CachedUidGenerator -->
<bean />

Mybatis配置，mybatis-spring.xml配置说明如下:

<!-- Spring annotation扫描 -->
<context:component-scan base-package="com.baidu.fsg.uid" />
<bean />
</bean>

0x05：测试

@Resource
private UidGenerator uidGenerator;
@Test
public void testSerialGenerate() {
// Generate UID
long uid = uidGenerator.getUID();
// Parse UID into [Timestamp, WorkerId, Sequence]
// {"UID":"180363646902239241","parsed":{ "timestamp":"2017-01-19 12:15:46", "workerId":"4", "sequence":"9" }}
System.out.println(uidGenerator.parseUID(uid));

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