Java uses Redis to implement distributed locks

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/** * @param subkey Set Key name * @param timeout get lock timeout,if not get, * @param the unit time unit * @para  
		  M svalue * @return/public static Boolean Trylock (String subkey, String Svalue,long Timeout, Timeunit unit) {  
		  String key = subkey;
			Jedis Jedis = null; 
				try {Jedis = GetResource ();
				if (Jedis = = null) {return boolean.false;
				Long nano = System.nanotime ();
					do {logger.debug ("Try Lock key:" + key);  Long i = jedis.setnx (key, svalue); Deadlock may occur here (after performing setnx, Redis crash, key always exists) if (i = = 1) {Jedis.expire (key, 5);/Lock Expiration Time 5 sec logger.debug ("get
						Lock, Key: "+ key +", expire in "+ 2 +" seconds ");
					return boolean.true;
					//Resolve deadlock problem can be optimized for Getset mode reset value//key existence, get key content value, value is Nanotime nanosecond, current time-key value > lock time, can acquire lock
					String value = Jedis.get (key); if (Stringutils.isnotblank (value) &&!
						Nil ". Equalsignorecase (value) &&	(System.nanotime ()-long.valueof (value)) >timeunit.seconds.tonanos (5)) {Set (key, value, 5);//Set key 5-second expiration automatic release
					return boolean.true;
						if (timeout = = 0) {//Lock is not taken, do not wait, return directly.
					Break } thread.sleep ((int) (50*math.random () +50))//wait 50-100 milliseconds to avoid the same race time for different threads (System.nanotime ()-Nano) <
					Unit.tonanos (timeout));//wait until the lock is taken until timeout if (logger.isinfoenabled ()) {String desc = jedis.get (key);
				Logger.debug ("key:" + key + "locked by another business:" + desc);
			return boolean.false;
			}catch (Exception e) {logger.error (E.getmessage (), E);  
		 finally {Returnresource (Jedis);/free connection} return boolean.false; /** get key corresponding value, the ratio content, the same delete, release the lock, avoid deleting other threads have acquired the lock * @param subkey * @param svalue * * Public stat
			IC boolean UnLock (String subkey,string svalue) {string key = subkey;
			Jedis Jedis = null; 
				try {Jedis = GetResource (); if (Jedis = null) {RETUrn false;
				String str = jedis.get (subkey);
					if (Str.equals (svalue)) {Jedis.del (key);
					Logger.debug ("Release lock, Keys:" + key);
				return true;
				}else {logger.debug ("The key is not exist,key:" + key);
			The catch (Exception e) {logger.error (E.getmessage (), E);
		finally {Returnresource (Jedis);/free connection} return false;
			public static void Main (string args[]) {string svalue = String.valueof (System.nanotime ());
			String subkey = "ProductId";
				try {//5000 ms Boolean lock = Trylock (subkey, Svalue, 5000, timeunit.milliseconds);
			if (lock) {//do job related business logic} catch (Exception e) {e.printstacktrace ();
			}finally{UnLock (subkey, svalue);

 }
			
			
		}