lock

type Lock interface {
	// Try to acquire a lock. Returns false if failed.
	TryLock(s string) bool
	// Try to acquire a lock. Returns false if failed.
	// Allows n simultaneous locks to be held
	TryLockShared(s string, n int) bool

	// Try to acquire a lock and wait for specified period of time for the lock
	// to become available. Returns false if failed.
	Lock(s string, waitDuration time.Duration) bool

	// Check if we still have the lock. Try to reacquire if necessary.
	// Returns false in the case of failure
	Refresh() bool

	// Unlock the lock. Returns false if there was failure
	Unlock() bool

	//Close releases resources associated with the lock
	Close() bool
}