Utility class that allows clients to keep track of a rate limit. 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(2, maxTasksPerSecond / 5) calls may return true. The upper bound mainly comes from the assumption that System.nanoTime has a resolution of 100.millis.
• 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 when n goes towards infinity. See the unit tests to get a better understanding of the term "roughly".