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README
Apache-2.0

分布式ID生成器(雪花算法SpringBoot版)

介绍

分布式ID生成器:

全局唯一ID作为一种唯一标识来区分数据,可用作订单号、用户ID等。ID生成器是生成全局唯一ID的工具,可封装为一种基础服务为其他业务提供服务。因此此项目就是用springboot封装ID生成器,让各种业务系统调用

雪花算法

ID生成算法有很多种,此项目是严格遵循Twitter开源的雪花算法来生成唯一性ID。 它是带有时间戳的全局唯一ID生成算法。有一套固定的ID格式,如下:

41位的时间戳(精确到毫秒,41位的长度可使用69年)
10位的机器ID(10位长度最多支持1024个服务器节点部署)
12位的计数序列号(12位支持每节点每毫秒最多生成4096个序列号)

使用

启动运行项目

根目录下执行maven命令

mvn clean install -DskipTests -Dmaven.test.skip=true 

在id-generate-rest的target目录下找到打包生成的zip包,如下图

Snip20170901_21.png-69.6kB

找到红线所指的zip包解压,然后放置到本地某一目录下,这里我是放置在我本机电脑根目录下。如下图

Snip20170901_22.png-14.4kB

切换到终端窗口,进入bin目录,执行start.sh启动脚本 命令如下:

./start.sh
ps -ef |grep restApplication

如果出现如下图情形,则证明项目启动成功

Snip20170901_24.png-288.7kB

我设置的启动端口为10010,上下文名字为myID

在浏览器窗口输入http://localhost:10010/myID/swagger-ui.html,界面如下

Snip20170901_19.png-121kB

使用Swagger查看和测试4个springboot封装的API接口,具体介绍Swagger中已有,下文我也会详细截图说明

API使用介绍

4个API接口

实时生成ID

如图,直接点击“try it out”按钮,不需要输入任何参数,返回long型ID

Snip20170901_25.png-159.2kB

解析ID

如图,可用前一接口生成的ID,拷贝到输入框,然后直接点击“try it out”按钮,返回json格式字符串,包括时间戳,机器ID和序列号3个属性值

Snip20170901_26.png-155.5kB Snip20170901_27.png-74.3kB

输入参数生成ID

输入json格式字符串,包括时间戳,机器ID和序列号3个属性值,返回long型ID。如下图 建议输入解析ID接口返回的json格式字符串,和前一接口是互逆操作

Snip20170901_28.png-171kB Snip20170901_29.png-78.2kB

解析时间戳

输入时间戳值,返回具体的日期值,格式是yyyy-MM-dd HH:mm:ss。如下图 建议输入此前json格式字符串中时间戳值

Snip20170901_30.png-165.5kB

脚本概述

start.sh

启动脚本内容如下

#!/bin/sh
echo -------------------------------------------
echo start server
echo -------------------------------------------
# 设置项目代码路径
export CODE_HOME="/id-generate-rest"
#日志路径
export LOG_PATH="/Users/wujunshen/Downloads/id-generator"
mkdir -p $LOG_PATH
# 设置依赖路径
export CLASSPATH="$CODE_HOME/classes:$CODE_HOME/lib/*"
# java可执行文件位置
export _EXECJAVA="$JAVA_HOME/bin/java"
# JVM启动参数
export JAVA_OPTS="-server -Xms8m -Xmx2048m "
# 服务端端口、上下文、项目根配置
export SERVER_INFO="-Dserver.port=10010 -Dserver.contextPath=/myID -Dserver.docBase=$CODE_HOME"
# 启动类
export MAIN_CLASS=com.wujunshen.rest.RestApplication

nohup $_EXECJAVA $JAVA_OPTS -classpath $CLASSPATH $SERVER_INFO $MAIN_CLASS >$LOG_PATH/id-generator.log  2>&1 &

CODE_HOME和LOG_PATH可自行根据zip包解压的目录进行配置修改。包括最后一行的日志文件名,都可修改。 启动类即springboot的Application启动类,相应JVM参数也可根据自身电脑硬件配置做增添修改。还有脚本中端口和上下文名需要和项目中/id-generate-rest/src/main/resources/application.properties文件中的server.port和server.context-path的值一致.

stop.sh

停止脚本内容如下

#日志路径
export LOG_PATH="/Users/wujunshen/Downloads/id-generator"
mkdir -p $LOG_PATH
# 启动类
export MAIN_CLASS=com.wujunshen.rest.RestApplication

echo -------------------------------------------
echo stop server

#所有相关进程
PIDs=`jps -l | grep $MAIN_CLASS | awk '{print $1}'`
#停止进程
if [ -n "$PIDs" ]; then
for PID in $PIDs; do
kill $PID
echo "kill $PID"
done
fi

#等待50秒
for i in 1 10; do
PIDs=`jps -l | grep $MAIN_CLASS | awk '{print $1}'`
if [ ! -n "$PIDs" ]; then
echo "stop server success"
echo -------------------------------------------
break
fi
echo "sleep 5s"
sleep 5
done

#如果等待50秒还没有停止完,直接杀掉
PIDs=`jps -l | grep $MAIN_CLASS | awk '{print $1}'`
if [ -n "$PIDs" ]; then
for PID in $PIDs; do
kill -9 $PID
echo "kill -9 $PID"
done
fi

LOG_PATH和MAIN_CLASS和start.sh中配置相一致即可。其它无需做任何改动。

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简介

全部改掉了,换回原先经典的雪花算法,41位时间戳+10位机器ID+12位序列号。只封装了rest风格的API~去除数据库等繁琐的封装。欢迎大家来做压测。 展开 收起
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