Redis生成份布式系统全局唯一ID的实现
散布式系统全局唯一ID
在互联网系统中，并发越大的系统，数据就越大，数据越大就越需要散布式，而大量的散布式数据就越需要唯一标识来辨认它们。
例如淘宝的商品系统有千亿级别商品，定单系统有万亿级别的定单数据，这些数据都是日渐增长，传统的单库单表是没法支持这类级别的数据，一定要对其进行分库分表；一旦分库分表，表的自增ID就失去了意义；故需要一个全局唯一的ID来标识每条数据（商品、定单）。
e.g: 一张表1亿条数据，被分库分表10张表，本来的ID就失去意义，所以需要全局唯一ID来标识10张表的数据。
全局唯一的ID生成的技术方案有很多，业界比较着名的有 UUID、Redis、Twitter的snowflake算法、美团Leaf算法。
基于Redis INCR 命令生成份布式全局唯一ID
INCR 命令主要有以下2个特点：
- Redis的INCR命令具有了“INCR AND GET”的原子操作
- Redis是单进程单线程架构，INCR命令不会出现ID重复
基于以上2个特性，可以采取INCR命令来实现散布式全局ID生成。
采取Redis生成商品全局唯一ID
Project Directory
Maven Dependency
<?xml version="1.0" encoding="UTF⑻"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven⑷.0.0.xsd">
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.8.RELEASE</version>
<relativePath/>
</parent>
<modelVersion>4.0.0</modelVersion>
<groupId>org.fool.redis</groupId>
<artifactId>redis-string-id</artifactId>
<version>1.0-SNAPSHOT</version>
<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.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.12</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
application.properties
spring.application.name=redis-spring-id
server.port=8888
spring.redis.host=localhost
spring.redis.port=6379
spring.redis.database=0
spring.redis.password=
spring.redis.timeout=2000
spring.redis.pool.max-active=10
spring.redis.pool.max-wait=1000
spring.redis.pool.max-idle=10
spring.redis.pool.min-idle=5
spring.redis.pool.num-tests-per-eviction-run=1024
spring.redis.pool.time-between-eviction-runs-millis=30000
spring.redis.pool.min-evictable-idle-time-millis=60000
spring.redis.pool.soft-min-evictable-idle-time-millis=10000
spring.redis.pool.test-on-borrow=true
spring.redis.pool.test-while-idle=true
spring.redis.pool.block-when-exhausted=false
SRC
Application.java
package org.fool.redis;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
Product.java
package org.fool.redis.model;
import lombok.Data;
import java.math.BigDecimal;
@Data
public class Product {
private Long id;
private String name;
private BigDecimal price;
private String detail;
}
IdGeneratorService.java
package org.fool.redis.service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
@Service
public class IdGeneratorService {
@Autowired
private StringRedisTemplate stringRedisTemplate;
private static final String ID_KEY = "id:generator:product";
public Long incrementId() {
return stringRedisTemplate.opsForValue().increment(ID_KEY);
}
}
ProductController.java
package org.fool.redis.controller;
import lombok.extern.slf4j.Slf4j;
import org.fool.redis.model.Product;
import org.fool.redis.service.IdGeneratorService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@Slf4j
@RequestMapping(value = "/product")
public class ProductController {
@Autowired
private IdGeneratorService idGeneratorService;
@PostMapping(value = "/create")
public String create(@RequestBody Product obj) {
//生成份布式id
long id = idGeneratorService.incrementId();
//使用全局id 代替数据库的自增id
obj.setId(id);
//取模(e.g: 这里分为8张表，海量数据可以分为1024张表)，计算表名
int table = (int) id % 8;
String tableName = "product_" + table;
log.info("insert to table: {}, with content: {}", tableName, obj);
return "insert to table: " + tableName + " with content: " + obj;
}
}
Test
curl –location –request POST ‘http://localhost:8888/product/create’ \
–header ‘Content-Type: application/json’ \
–data-raw ‘{
“name”: “Car”,
“price”: “300000.00”,
“detail”: “Lexus Style”
}’
Console Output
到此这篇关于Redis生成份布式系统全局唯一ID的实现的文章就介绍到这了,更多相关Redis生成份布式系统全局唯一ID内容请搜索之前的文章或继续浏览下面的相关文章希望大家以后多多支持！
文章来源：丸子建站
文章标题：Redis生成份布式系统全局唯一ID的实现
https://www.wanzijz.com/view/64971.html
