Trigger() requests execution of the throttled resource.

Stop() stops the throttler.

Next() returns true at most once per `period`. If false is returned the throttler has been stoped.

NewThrottle returns a new Throttle. If trailing is true then a multiple Trigger() calls in one period will cause a delayed Trigger() to be called in

Next() returns true at most once per period. While it returns true, the throttle is running. When it returns false the throttle has been stopped.

Stop the throttle

ThottleFunc executes f at most once every period. Stop() must eventually be called on the return value to prevent a leaked go proc.

Trigger signals an attempt to execute the throttled code. If Trigger is called twice within the same period, Next() will be called once for that perio