NHibernate.Caches.Redis.RedisCache.Unlock C# (CSharp) Method

        public virtual void Unlock(object key)
        {
            // Use Remove() instead of Get() because we are releasing the lock
            // anyways.
            var lockData = acquiredLocks.Remove(Convert.ToString(key)) as LockData;
            if (lockData == null)
            {
                log.WarnFormat("attempted to unlock '{0}' but a previous lock was not acquired or timed out", key);
                var unlockFailedEventArgs = new UnlockFailedEventArgs(
                    RegionName, key, lockKey: null, lockValue: null
                );
                options.OnUnlockFailed(this, unlockFailedEventArgs);
                return;
            }

            log.DebugFormat("releasing cache lock: regionName='{0}', key='{1}', lockKey='{2}', lockValue='{3}'", 
                RegionName, lockData.Key, lockData.LockKey, lockData.LockValue
            );

            try
            {
                var db = GetDatabase();

                // Don't use IDatabase.LockRelease() because it uses watch/unwatch
                // where we prefer an atomic operation (via a script).
                var wasLockReleased = (bool)db.ScriptEvaluate(unlockScript, new
                {
                    lockKey = lockData.LockKey,
                    lockValue = lockData.LockValue
                });

                if (!wasLockReleased)
                {
                    log.WarnFormat("attempted to unlock '{0}' but it could not be released (it maybe timed out or was cleared in Redis)", lockData);

                    var unlockFailedEventArgs = new UnlockFailedEventArgs(
                        RegionName, key, lockData.LockKey, lockData.LockValue
                    );
                    options.OnUnlockFailed(this, unlockFailedEventArgs);
                }
            }
            catch (Exception e)
            {
                log.ErrorFormat("could not release cache lock: regionName='{0}', key='{1}', lockKey='{2}', lockValue='{3}'",
                    RegionName, lockData.Key, lockData.LockKey, lockData.LockValue
                );

                var evtArg = new ExceptionEventArgs(RegionName, RedisCacheMethod.Unlock, e);
                options.OnException(this, evtArg);
                if (evtArg.Throw)
                {
                    throw new RedisCacheException(RegionName, "Failed to unlock item in cache. See inner exception.", e);
                }
            }
        }