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实现延迟队列的思路

zset的特性，带有分数的排序，以时间戳作为分数进行排序

1. 添加任务 zdd
2. 取出任务 zrangbyscore
3. 执行任务 zrem

定时任务

  public static void main(String[] args) {Jedis jedis = new Jedis("ip", 6379);TimerTask task = new TimerTask() {@Overridepublic void run() {// 这里是定时任务的执行代码Set<String> order = jedis.zrangeByScore("delayOrderQueue", System.currentTimeMillis()-10000, System.currentTimeMillis());//取出任务进行执行for (String orderId : order) {Long order1 = jedis.zrem("delayOrderQueue", orderId);System.out.println("执行任务：" +  orderId);}}};Timer timer = new Timer();long delay = 0; // 延迟开始执行时间，单位：毫秒long period = 1000; // 定时任务执行间隔，单位：毫秒timer.scheduleAtFixedRate(task,delay,period);}

添加任务

/*** zset实现实现延迟队列*/@Testpublic void TestZet(){long currentTimeMillis = System.currentTimeMillis();System.out.println(currentTimeMillis);jedis.zadd("delayOrderQueue", currentTimeMillis, "1");jedis.zadd("delayOrderQueue", currentTimeMillis+3000, "2");jedis.zadd("delayOrderQueue", currentTimeMillis+5000, "3");}