springboot 集成百度的惟一ID生成器

UidGenerator是百度開源的Java語言實現，基於Snowflake算法的惟一ID生成器。並且，它很是適合虛擬環境，好比：Docker。另外，它經過消費將來時間克服了雪花算法的併發限制。UidGenerator提早生成ID並緩存在RingBuffer中。壓測結果顯示，單個實例的QPS能超過6000,000。

集成方法：node

1.下載git

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

2.修改一下項目的版本算法

<dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.6</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.0</version>
        </dependency>

3.將cached-uid-spring.xml copy 到 resources 的 config 目錄中。spring

並增長一個配置類緩存

import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.ImportResource; @Configuration @ImportResource(locations = {"classpath:config/cached-uid-spring.xml"}) public class UidGeneratorConf { }

cached-uid-spring.xml
配置文件內容以下：

<?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" />
        <property name="timeBits" value="30" />
        <property name="workerBits" value="20"/>
        <property name="epochStr" value="2019-05-10"/>

    </bean>

</beans>

4.建立一張表WORKER_NODEmybatis

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;

5.增長 mybatis map 文件的配置併發

mapper-locations: classpath*:/mapper/sys/core/*.map.xml,classpath*:/mapper/WORKER_NODE.xml

6.增長mybatis dao 類掃描app

@MapperScan({"com.baidu.fsg"})

7.增長一個ID產類單元測試

public class UidUtil { /** * 使用百度UID獲取惟一ID * @return
     */
    public static long genId(){ UidGenerator uidGenerator= AppBeanUtil.getBean("cachedUidGenerator"); return uidGenerator.getUID(); } }

8.使用單元測試產生ID

@RunWith(SpringRunner.class) @SpringBootTest public class IdTest { @Test public void genIdTest(){ long str=UidUtil.genId(); System.err.println(str); } }

9.ID產生實現原理以下：

https://www.jianshu.com/p/5509cc1b9a94