rain

Distributed global ID generation service, ID generation is divided into two modes：

• segment
• snowflake

How to use see the following introduction.

Quick Start

1. Install dependencies

• JDK 11
• MySQL8
• Maven 3.8.5

2. Database initialization

2.1 Create table

Run the sql script to create the database and tables：

DROP DATABASE IF EXISTS `uidgenerator`;
CREATE DATABASE `uidgenerator` ;
use `uidgenerator`;

DROP TABLE IF EXISTS mxsm_allocation;
CREATE TABLE `mxsm_allocation` (
 `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键ID',
 `biz_code` varchar(128) COLLATE utf8mb4_general_ci NOT NULL COMMENT '业务编码(用户ID,使用业务方编码)',
 `max_id` bigint NOT NULL DEFAULT '1' COMMENT '最大值',
 `step` int NOT NULL COMMENT '步长',
 `description` varchar(255) COLLATE utf8mb4_general_ci DEFAULT '' COMMENT '说明',
 `create_time` timestamp NOT NULL COMMENT '创建时间',
 `update_time` timestamp NOT NULL ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
 PRIMARY KEY (`id`),
 UNIQUE KEY `biz_code_index` (`biz_code`) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;

DROP TABLE IF EXISTS mxsm_snowfalke_node;
CREATE TABLE `mxsm_snowfalke_node` (
 `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键ID',
 `host_name` bigint NOT NULL COMMENT 'IP地址',
 `port` int NOT NULL DEFAULT '1' COMMENT '端口',
 `deploy_env_type` enum('ACTUAL','CONTAINER') COLLATE utf8mb4_general_ci DEFAULT 'ACTUAL' COMMENT '部署环境类型',
 `description` varchar(255) COLLATE utf8mb4_general_ci DEFAULT '' COMMENT '说明',
 `create_time` timestamp NOT NULL COMMENT '创建时间',
 `update_time` timestamp NOT NULL ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
 PRIMARY KEY (`id`),
 UNIQUE KEY `mix_index` (`host_name`,`port`) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;

3. rain deployment and start

3.1 Via the provided package

Step 1：Download binary package

It can be downloaded from the latest stable release page rain-server-1.0.1-SNAPSHOT.tar.gz

tar -zxvf rain-server-1.0.1-SNAPSHOT.tar.gz
cd rain-server-1.0.1-SNAPSHOT/

Step 2：Modify conf/application.properties

Modify the database-related configuration in the application.properties configuration:

spring.datasource.url=jdbc:mysql://ip:port/uidgenerator?useUnicode=true&characterEncoding=utf-8
spring.datasource.username=xxx
spring.datasource.password=xxxxx

Tips: make sure the database address, name, port number, username, and password are correct.

Step 3：Start server

sh bin/start.sh

4. Segment mode UID generation configuration

Modify conf/application.properties

config	default value	explain
mxsm.uid.segment.threshold	40	In cache mode, when the local cache threshold is lower than or equal to 40%, the segment filling will be loaded to the database, and the value ranges from 0 to 100
mxsm.uid.segment.cache-size	16	Number of cached segments to load by default in cache mode

The size of threshold and cache-size affects the frequency of segment obtained from the data. If cache-size is set too large, it will cause a waste of UID when the project is stopped for maintenance. But the cache-size is large enough that bizCode is loaded in memory before it can continue serving in the event of a database crash。

5. Snowflake pattern UID generation configuration

Modify conf/application.properties :

config	default value	explain
mxsm.uid.snowflake.timestamp-bits	41	The number of bits of timestamp for the snowflake algorithm
mxsm.uid.snowflake.machine-id-bits	10	The number of bits in the machine id of the snowflake algorithm
mxsm.uid.snowflake.sequence-bits	12	The number of bits in the snowflake algorithm sequence number
mxsm.uid.snowflake.container	false	Whether the deployment is containerized
mxsm.uid.snowflake.time-bits-second	false	timestamp Whether it is in seconds
mxsm.uid.snowflake.epoch	2022-05-01	timestamp The relative time in the format yyyy-MM-dd and before the current time

timestamp-bits、machine-id-bits、sequence-bits三个位数和加起来要等于63。

6. Java SDK

maven client dependence：

<dependency>
  <groupId>com.github.mxsm</groupId>
  <artifactId>rain-uidgenerator-client</artifactId>
  <version>${latest version}</version>
</dependency>

example:

UidClient client = UidClient.builder()
            .setUidGeneratorServerUir("http://172.29.250.21:8080") //设置服务地址
            .setSegmentNum(10) //设置获取的segment数量
            .setThreshold(20) //设置阈值
            .isSegmentUidFromRemote(false) //设置是否直接从服务器通过Restful接口的方式获取
            .build();
long uid = client.getSegmentUid("mxsm");
long uidRemote = client.getSegmentUid("mxsm", true);
long snowflake =  client.getSnowflakeUid();

Source Code Quick Start

Step 1： clone code

git clone https://github.com/mxsm/rain.git
cd rain

Step 2：Modify application.properties in rain-uidgenerator-server

spring.datasource.url=jdbc:mysql://ip:port/uidgenerator?useUnicode=true&characterEncoding=utf-8
spring.datasource.username=xxx
spring.datasource.password=xxxxx

Step 3：maven package server

mvn clean package -DskipTests=true

Step 4：Start server

java -Xms1g -Xmx1g -jar ./rain-uidgenerator-server/target/rain-uidgenerator-server-1.0.1-SNAPSHOT.jar

Documentation

TODO