uid-generator
官网集成文档：
https://github.com/baidu/uid-generator/blob/master/README.zh_cn.md
由于并没有提供springboot集成版本，网上找的都缺少必须步骤，我这里梳理一下详细的uid-generator与springboot2集成的步骤
uid-generator与springboot2集成初始化
创建一个MySQL数据库名称为baiduUidGenerator
执行如下SQL
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;uid-generator与springboot2集成
初始化一个springboot项目，并修改pom文件如下
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.0</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</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>com.baidu.fsg</groupId>
<artifactId>uid-generator</artifactId>
<version>1.0.0-SNAPSHOT</version>
</dependency>
</dependencies>修改配置文件application.properties（注意MySQL地址、数据库名称账户等于之前建表的保持一致）
server.port=9999
spring.datasource.url=jdbc:mysql://*.*.*.*:3306/baiduUidGenerator?useUnicode=true&characterEncoding=utf-8&useSSL=false
spring.datasource.username=root
spring.datasource.password=*
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
mybatis.mapper-locations=classpath:mapper/*.xml
mybatis.configuration.map-underscore-to-camel-case=true新建UidGenService，内容如下
package org.zxp.uidgeneratortest;
import com.baidu.fsg.uid.UidGenerator;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
/**
* @program: uidgeneratortest
* @description:
* @author: X-Pacific zhang
* @create: 2019-10-13 17:28
**/
@Service
public class UidGenService {
@Resource
private UidGenerator uidGenerator;
public long getUid() {
return uidGenerator.getUID();
}
}
与启动类同级目录新建WorkerNodeMapper内容如下（下面的两步是解决UidGenerator与springboot集成出现的无法正常注入bean的问题）
/*
* 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 org.zxp.uidgeneratortest;
import com.baidu.fsg.uid.worker.entity.WorkerNodeEntity;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;
/**
* DAO for M_WORKER_NODE
*
* @author yutianbao
*/
@Repository
public interface WorkerNodeMapper {
/**
* Get {@link WorkerNodeEntity} by node host
*
* @param host
* @param port
* @return
*/
WorkerNodeEntity getWorkerNodeByHostPort(@Param("host") String host, @Param("port") String port);
/**
* Add {@link WorkerNodeEntity}
*
* @param workerNodeEntity
*/
void addWorkerNode(WorkerNodeEntity workerNodeEntity);
}与启动类同级目录新建DisposableWorkerIdAssigner内容如下
/*
* 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 org.zxp.uidgeneratortest;
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.beans.factory.annotation.Autowired;
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 yutianbao
*/
public class DisposableWorkerIdAssigner implements WorkerIdAssigner {
private static final Logger LOGGER = LoggerFactory.getLogger(DisposableWorkerIdAssigner.class);
@Autowired
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
*/
@Override
@Transactional
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;
}
}springboot启动类上添加注解，org.zxp.uidgeneratortest需要更新为你的工程路径
@RestController
@ComponentScan(basePackages = {"org.zxp.uidgeneratortest","com.baidu.fsg"})
@MapperScan("org.zxp.uidgeneratortest")resources下创建mapper目录（为了同配置文件路径一致）并创建文件WorkerNodeMapper.xml，内容如下：
<?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="org.zxp.uidgeneratortest.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>springboot启动类添加如下方法（做一些代替xml的配置以及测试的controller）
@Autowired
private UidGenService uidGenService;
@GetMapping("/getuid")
public String getUid() {
return String.valueOf( uidGenService.getUid() );
}
@Bean("disposableWorkerIdAssigner")
public DisposableWorkerIdAssigner disposableWorkerIdAssigner(){
DisposableWorkerIdAssigner disposableWorkerIdAssigner = new DisposableWorkerIdAssigner();
return disposableWorkerIdAssigner;
}
@Bean("cachedUidGenerator")
public UidGenerator uidGenerator(DisposableWorkerIdAssigner disposableWorkerIdAssigner){
CachedUidGenerator cachedUidGenerator = new CachedUidGenerator();
cachedUidGenerator.setWorkerIdAssigner(disposableWorkerIdAssigner);
return cachedUidGenerator;
}测试
启动springboot工程
访问：http://localhost:9999/getuid
返回：3686802606946000922
成功！