PeriodicRunner (timeutils API)

All Known Implementing Classes:

FakePeriodicRunner, SimplePeriodicRunner
```
public interface PeriodicRunner
```
An object that can run a single Runnable task repeatedly at a steady rate. Callers can optionally stop (and then optionally re-start) the Runnable task.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`setPeriodicTask(Runnable task)`	Specify the task that this PeriodicRunner should run periodically.
`void`	`start()`	Start calling the specified Runnable task periodically.
`void`	`stop()`	Stop calling the specified Runnable task periodically.

- Method Detail
  - setPeriodicTask
```
void setPeriodicTask(Runnable task)
```
    Specify the task that this PeriodicRunner should run periodically. The specified task will not be run until after the start() method has been called.
    
    Parameters:
    
    task - The task to run periodically.
    
    Throws:
    
    IllegalStateException - if a task has already been provided and has been started, but not stopped yet. To avoid this, stop the other task before calling this method.
  - start
```
void start()
```
    Start calling the specified Runnable task periodically.
    
    Throws:
    
    IllegalStateException - if no task has been provided, or if the task has already been started.
  - stop
```
void stop()
```
    Stop calling the specified Runnable task periodically.
    
    Throws:
    
    IllegalStateException - if no task has been provided, or has been provided but has not been started.