锁服务

ExponentialBackoff strategy is an optimization strategy with a retry time of 2**n milliseconds (n means number of times).

LimitRetry limits the number of retries to max attempts.

LinearBackoff allows retries regularly with customized intervals.

NoRetry acquire the lock only once.

ErrLockNotHeld is returned when trying to release an inactive lock.

ErrNotObtained is returned when a lock cannot be obtained.

Options describe the options for the lock.

Lock represents an obtained, distributed lock.

RetryStrategy allows to customise the lock retry strategy.