详解Spring Boot工程集成全局唯一ID生成器 UidGenerator的操作步骤

<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>

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

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;

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="
 http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd">
 <!-- UID generator -->
 <bean id="disposableWorkerIdAssigner" class="com.baidu.fsg.uid.worker.DisposableWorkerIdAssigner" />
 <bean id="cachedUidGenerator" class="com.baidu.fsg.uid.impl.CachedUidGenerator">
 <property name="workerIdAssigner" ref="disposableWorkerIdAssigner" />
 <!-- 以下为可选配置, 如未指定将采用默认值 -->
 <!-- RingBuffer size扩容参数, 可提高UID生成的吞吐量. --> 
 <!-- 默认:3， 原bufferSize=8192, 扩容后bufferSize= 8192 << 3 = 65536 -->
 <!--<property name="boostPower" value="3"></property>--> 
 
 <!-- 指定何时向RingBuffer中填充UID, 取值为百分比(0, 100), 默认为50 -->
 <!-- 举例: bufferSize=1024, paddingFactor=50 -> threshold=1024 * 50 / 100 = 512. -->
 <!-- 当环上可用UID数量 < 512时, 将自动对RingBuffer进行填充补全 -->
 <!--<property name="paddingFactor" value="50"></property>--> 
 
 <!-- 另外一种RingBuffer填充时机, 在Schedule线程中, 周期性检查填充 -->
 <!-- 默认:不配置此项, 即不实用Schedule线程. 如需使用, 请指定Schedule线程时间间隔, 单位:秒 -->
 <!--<property name="scheduleInterval" value="60"></property>--> 
 
 <!-- 拒绝策略: 当环已满, 无法继续填充时 -->
 <!-- 默认无需指定, 将丢弃Put操作, 仅日志记录. 如有特殊需求, 请实现RejectedPutBufferHandler接口(支持Lambda表达式) -->
 <!--<property name="rejectedPutBufferHandler" ref="XxxxYourPutRejectPolicy"></property>--> 
 
 <!-- 拒绝策略: 当环已空, 无法继续获取时 -->
 <!-- 默认无需指定, 将记录日志, 并抛出UidGenerateException异常. 如有特殊需求, 请实现RejectedTakeBufferHandler接口(支持Lambda表达式) -->
 <!--<property name="rejectedPutBufferHandler" ref="XxxxYourPutRejectPolicy"></property>--> 
 
 </bean>
</beans>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.baidu.fsg.uid.worker.dao.WorkerNodeDAO">
 <resultMap id="workerNodeRes"
   type="com.baidu.fsg.uid.worker.entity.WorkerNodeEntity">
 <id column="ID" jdbcType="BIGINT" property="id" />
 <result column="HOST_NAME" jdbcType="VARCHAR" property="hostName" />
 <result column="PORT" jdbcType="VARCHAR" property="port" />
 <result column="TYPE" jdbcType="INTEGER" property="type" />
 <result column="LAUNCH_DATE" jdbcType="DATE" property="launchDate" />
 <result column="MODIFIED" jdbcType="TIMESTAMP" property="modified" />
 <result column="CREATED" jdbcType="TIMESTAMP" property="created" />
 </resultMap>
 <insert id="addWorkerNode" useGeneratedKeys="true" keyProperty="id"
 parameterType="com.baidu.fsg.uid.worker.entity.WorkerNodeEntity">
 INSERT INTO WORKER_NODE
 (HOST_NAME,
 PORT,
 TYPE,
 LAUNCH_DATE,
 MODIFIED,
 CREATED)
 VALUES (
 #{hostName},
 #{port},
 #{type},
 #{launchDate},
 NOW(),
 NOW())
 </insert>
 <select id="getWorkerNodeByHostPort" resultMap="workerNodeRes">
 SELECT
 ID,
 HOST_NAME,
 PORT,
 TYPE,
 LAUNCH_DATE,
 MODIFIED,
 CREATED
 FROM
 WORKER_NODE
 WHERE
 HOST_NAME = #{host} AND PORT = #{port}
 </select>
</mapper>

@Configuration
@ImportResource(locations = { "classpath:uid/cached-uid-spring.xml" })
public class UidConfig {
}

@Service
public class UidGenService {

  @Resource
  private UidGenerator uidGenerator;

  public long getUid() {
    return uidGenerator.getUID();
  }
}

@RestController
public class UidTestController {

  @Autowired
  private UidGenService uidGenService;

  @GetMapping("/testuid")
  public String test() {
    return String.valueOf( uidGenService.getUid() );
  }
}