Utility class that allows clients to keep track of a rate limit.

The decay rate limiter keeps track of the current rate, allowing temporary bursts. This allows temporary bursts at the risk of overloading the system too quickly.

Clients need to tell an instance whenever they intend to start a new task. The instance will inform the client whether the task can be executed while still meeting the rate limit.

Guarantees:

• Maximum burst size: if checkAndUpdateRate is called n times in parallel, at most max 1, maxTasksPerSecond * maxBurstFactor calls may return true.
• Average rate: if checkAndUpdateRate is called at a rate of at least maxTasksPerSecond during n seconds, then the number of calls that return true divided by n is roughly maxTasksPerSecond .*