周期任务-选举领航者
每隔单位时间执行一次任务，多节点需要同步
1 @Autowired 2 RedissonClient redissonClient; 3 4 /** 5 * 时间分片 6 */ 7 private final static long INTERVAL = 30_000L; 8 /** 9 * 对象名 10 */ 11 private final static String BUCKET_NAME = ""; 12 /** 13 * 上次时间分片数 14 */ 15 private static long lastTotalIntervals = 0; 16 /** 17 * 领航者标识 18 */ 19 private static boolean lastProcess = false; 20 21 /** 22 * 判断本次是否执行操作 23 * 每 INTERVAL << 1 重新选举 24 * 25 * @return TRUE | FALSE 26 */ 27 private boolean operateOneInterval() { 28 // 领航者优先一个时间分片,最多两次运行机会 29 long currentTotalIntervals = 30 ((lastProcess ? INTERVAL : 0L) + System.currentTimeMillis()) 31 / (INTERVAL << 1); 32 // 比较本地分片 33 if (currentTotalIntervals > lastTotalIntervals) { 34 RBucket<Long> oneIntervalBucket = redissonClient.getBucket(BUCKET_NAME); 35 // 比较最新分片 36 Long redisTotalIntervals = oneIntervalBucket.get(); 37 if (Objects.isNull(redisTotalIntervals) 38 || currentTotalIntervals > (lastTotalIntervals = redisTotalIntervals)) { 39 boolean beforeStatue = lastProcess; 40 // 选举领航者,更新标识 41 lastProcess = oneIntervalBucket.compareAndSet(redisTotalIntervals, currentTotalIntervals); 42 System.out.printf("争抢结果:%b, 节点变更:%b", lastProcess, beforeStatue != lastProcess); 43 } 44 } 45 return lastProcess; 46 }
