Redis Distributed Lock

1 package COM. ZAD. jedis; 2 3 Import redis. clients. jedis. jedis; 4 5 import Java. util. collections; 6 7/** 8 * Description: 9 * Distributed Lock 10*11 * @ author zad12 * @ create 2018-09-14 13: 5813 */14 public class distributed {15 Private Static final string lock_success = "OK"; 16 Private Static final string set_if_not_exist = "NX "; 17 Private Static final string set_with_expire_time = "PX"; 18 Private Static final integer release_success = 1; 19 Private Static final integer default_time = 5; 20 21/** 22 * try to obtain the Distributed Lock 23*24 * @ Param Jedis redis client 25 * @ Param lockkey lock 26 * @ Param requestid Request ID 27 * @ return whether the query is successful 28 */29 public static Boolean trygetdistributedlock (Jedis, string lockkey, string requestid) {30 31 string result = Jedis. set (lockkey, requestid, set_if_not_exist, set_with_expire_time, default_time); 32 33 If (lock_success.equals (result) {34 return true; 35} 36 return false; 37 38} 39 40 41/** 42 * try to obtain the Distributed Lock 43*44 * @ Param Jedis redis client 45 * @ Param lockkey lock 46 * @ Param requestid Request ID 47 *@ param expiretime expiration time 48 * @ return whether the query is successful 49 */50 public static Boolean trygetdistributedlock (Jedis, string lockkey, string requestid, int expiretime) {51 52 string result = Jedis. set (lockkey, requestid, set_if_not_exist, set_with_expire_time, expiretime); 53 54 if (lock_success.equals (result) {55 return true; 56} 57 Return false; 58 59} 60 61/** 62 * release Distributed Lock 63*64 * @ Param Jedis redis client 65 * @ Param lockkey 66 * @ Param requestid Request ID 67 * @ return whether 68 */69 public static Boolean releasedistributedlock (Jedis, string lockkey, string requestid) {70 71 string script = "If redis. call ('get', keys [1]) = argv [1] Then return redis. call ('del ', keys [1]) else return 0 end "; 72 object result = Jedis. eval (script, collections. singletonlist (lockkey), collections. singletonlist (requestid); 73 74 if (release_success.equals (result) {75 return true; 76} 77 return false; 78 79} 80}

 

Redis Distributed Lock