关于使用 lua 脚本抢红包
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1 java代码
package com.robert.RedisTest; import redis.clients.jedis.Jedis; public class RedisClient { public static void main(String[] args) { System.out.println(getHongBao()); System.out.println(); } public static void doAppend(StringBuilder script,String expression){ script.append(expression+"\n"); } public static int getHongBao(){ Jedis jedis = new Jedis("localhost", 6379); jedis.set("name","robert"); StringBuilder script = new StringBuilder(); doAppend(script,"local result = 0"); doAppend(script,"local afterDescNum = redis.call(‘decr‘, KEYS[1])"); doAppend(script,"if afterDescNum>=0 then"); doAppend(script,"result=1"); doAppend(script,"else "); doAppend(script,"result=0"); doAppend(script,"redis.call(‘set‘, KEYS[1], 0)"); doAppend(script,"end"); script.append("return result"); Object result = jedis.eval(script.toString(),1,"hongbaoNum"); int flag = Integer.parseInt(String.valueOf(result)); System.out.println(Thread.currentThread().getName()+" : "+flag); return flag; } }
qianghongbao.lua
local result = 0 local afterDescNum = redis.call(‘decr‘, KEYS[1]) if afterDescNum>=0 then result=1 else result=0 redis.call(‘set‘, KEYS[1], 0) end return result
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