baidu UidGenerator 分布式id生成器, snowflake落地应用

Myth丶恋晨 2022-02-13 10:19 533阅读 0赞

# baidu UidGenerator id生成器 #

--------------------

`baidu/uid-generator` GitHub地址：

[https://github.com/baidu/uid-generator][https_github.com_baidu_uid-generator]

## 一、问题 ##

如果只是引入源码，在springboot中，出抛出以下异常：

> ‘com.baidu.fsg.uid.worker.dao.WorkerNodeDAO’ that could not be found

## 二、解决方案 ##

### 2.1 本地先编译源码生成jar包后引入项目 ###

<dependency>
        <groupId>com.baidu.fsg</groupId>
        <artifactId>uid-generator</artifactId>
        <version>1.0.0-SNAPSHOT</version>
    </dependency>

### 2.2 复制源码： ###

`WorkerNodeDAO`到自己的工程下，并重命名为`WorkerNodeMapper`

`WORKER_NODE.xml`–> `WorkerNodeMapper.xml`，注意修改命名空间

<?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="arthur.dy.lee.mybatisplusdemo.nova.mapper.WorkerNodeMapper">
       <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>

### 2.3 复制源码`DisposableWorkerIdAssigner.java` ###

/* * Copyright (c) 2017 Baidu, Inc. All Rights Reserve. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */
    package arthur.dy.lee.mybatisplusdemo.nova.service;
    
    import arthur.dy.lee.mybatisplusdemo.nova.mapper.WorkerNodeMapper;
    import com.baidu.fsg.uid.utils.DockerUtils;
    import com.baidu.fsg.uid.utils.NetUtils;
    import com.baidu.fsg.uid.worker.WorkerIdAssigner;
    import com.baidu.fsg.uid.worker.WorkerNodeType;
    import com.baidu.fsg.uid.worker.entity.WorkerNodeEntity;
    import org.apache.commons.lang.math.RandomUtils;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.transaction.annotation.Transactional;
    
    import javax.annotation.Resource;
    
    /** * Represents an implementation of {@link WorkerIdAssigner}, * the worker id will be discarded after assigned to the UidGenerator * * @author arthur.dy.lee */
    
    public class DisposableWorkerIdAssigner implements WorkerIdAssigner { 
        private static final Logger LOGGER = LoggerFactory.getLogger(com.baidu.fsg.uid.worker.DisposableWorkerIdAssigner.class);
    
        @Resource
        private WorkerNodeMapper workerNodeMapper;
    
        /** * Assign worker id base on database.<p> * If there is host name & port in the environment, we considered that the node runs in Docker container<br> * Otherwise, the node runs on an actual machine. * * @return assigned worker id */
        @Transactional
        @Override
        public long assignWorkerId() { 
            // build worker node entity
            WorkerNodeEntity workerNodeEntity = buildWorkerNode();
    
            // add worker node for new (ignore the same IP + PORT)
            workerNodeMapper.addWorkerNode(workerNodeEntity);
            LOGGER.info("Add worker node:" + workerNodeEntity);
    
            return workerNodeEntity.getId();
        }
    
        /** * Build worker node entity by IP and PORT */
        private WorkerNodeEntity buildWorkerNode() { 
            WorkerNodeEntity workerNodeEntity = new WorkerNodeEntity();
            if (DockerUtils.isDocker()) { 
                workerNodeEntity.setType(WorkerNodeType.CONTAINER.value());
                workerNodeEntity.setHostName(DockerUtils.getDockerHost());
                workerNodeEntity.setPort(DockerUtils.getDockerPort());
    
            } else { 
                workerNodeEntity.setType(WorkerNodeType.ACTUAL.value());
                workerNodeEntity.setHostName(NetUtils.getLocalAddress());
                workerNodeEntity.setPort(System.currentTimeMillis() + "-" + RandomUtils.nextInt(100000));
            }
    
            return workerNodeEntity;
        }
    
    }

### 2.4 引入`application-bean.xml`，官网配置，修改DisposableWorkerIdAssigner为本地的包路径，如下： ###

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd" default-autowire="byName">
    
    
        
        <bean id="defaultUidGenerator" class="com.baidu.fsg.uid.impl.DefaultUidGenerator" lazy-init="false">
            <property name="workerIdAssigner" ref="disposableWorkerIdAssigner"/>
    
            
            <property name="timeBits" value="29"/>
            <property name="workerBits" value="21"/>
            <property name="seqBits" value="13"/>
            <property name="epochStr" value="2016-09-20"/>
        </bean>
    
        
        
        <bean id="disposableWorkerIdAssigner" class="arthur.dy.lee.mybatisplusdemo.nova.service.DisposableWorkerIdAssigner"/>
    
    </beans>

### 2.5 将xml引入到工程中，由spring容器去管理 ###

package arthur.dy.lee.mybatisplusdemo;
    
    import org.springframework.context.annotation.Configuration;
    import org.springframework.context.annotation.ImportResource;
    
    /** * @auther arthur.dy.lee * @since 2019/4/27 17:43 */
    @Configuration
    @ImportResource(locations = {  "classpath:application-bean.xml" })
    public class IdGeneratorConfiguration { 
    
    }

## 三、使用 ##

@Slf4j
    @RestController
    @RequestMapping("/nova/teacher4-test-in")
    public class Teacher4testInController { 
    
        @Autowired
        private ITeacher4testInService service;
    
        //注入
        @Resource
        private UidGenerator uidGenerator;
        
        /** * baidu uid生成器 */
        @RequestMapping("/insert")
        public void insertBatch() { 
            Teacher4testIn t = new Teacher4testIn();
            long id = uidGenerator.getUID(); // <-------
            t.setId(id);
            t.setName("lee-" + id);
            t.setIsDelete(false);
            t.setGmtCreate(LocalDate.now());
            t.setGmtModified(LocalDate.now());
            t.setModifier("lee");
            t.setAddress("address-" + id);
            t.setBak("备注1234567890");
            t.setClassNo(1);
            t.setCultivateHobby("我的爱好是运动-" + id);
            t.setCultivateHobby2("我的爱好是写代码-" + id);
            t.setCultivateHobby3("我的爱好是吹牛逼-" + id);
            t.setCultivateHobby4("我的爱好是登山-" + id);
            t.setCultivateHobby5("我的爱好是游泳-" + id);
            t.setCultivateHobby6("我的爱好是弹钢琴-" + id);
            t.setFocus(true);
            t.setHeight(16.0);
            t.setIq(100);
            t.setPhone(123456);
            t.setSex(true);
            boolean ret = service.save(t);
            log.info(JSONObject.toJSONString(ret));
        }
    }

## 四、源码地址： ##

访问url

[http://localhost:8081/nova/teacher4-test-in/insert][http_localhost_8081_nova_teacher4-test-in_insert]

码云下载地址：

[https://gitee.com/paincupid/mybatis-plus-demo][https_gitee.com_paincupid_mybatis-plus-demo]

## 参考： ##

[springboot2.0集成百度uidgenerator][springboot2.0_uidgenerator]

[https_github.com_baidu_uid-generator]: https://github.com/baidu/uid-generator
[http_localhost_8081_nova_teacher4-test-in_insert]: http://localhost:8081/nova/teacher4-test-in/insert
[https_gitee.com_paincupid_mybatis-plus-demo]: https://gitee.com/paincupid/mybatis-plus-demo
[springboot2.0_uidgenerator]: https://blog.csdn.net/a13794479495/article/details/83541569