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;

    }

}

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