ticket

type Ticket interface {
	// Take a ticket, if no tickets remain, then will be blocked.
	// if Ticket is closed, will return non-block.
	Take()
	// Return a ticket, if Ticket is closed, will return
	Return()
	// Remainder get the number of available tickets
	Remainder() int
	// Total is the total tickets
	Total() int
	// Close Ticket, Take() will get endless non-blocking tickets
	// return error, if Ticket has been closed
	Close() error
	// Reset will create new tickets
	Reset()
}