QueryableTimer (java-concurrent-utils API)

All Known Implementing Classes:

SimpleActiveTimer
```
public interface QueryableTimer
```
A timer that can be asked about its current state.
Valid timer states are:
- New: not started yet.
- Running: started, but not stopped yet.
- Stopped: started and then stopped.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Duration`	`elapsed()`	What is the elapsed time of this timer?
`boolean`	`hasBeenStarted()`	Has the timer been started?
`boolean`	`isRunning()`	Is the timer currently running?
`boolean`	`isStopped()`	Has the timer been stopped?

- Method Detail
  - hasBeenStarted
```
boolean hasBeenStarted()
```
    Has the timer been started?
    
    Returns:
    
    True if the timer has been started.
  - isRunning
```
boolean isRunning()
```
    Is the timer currently running?
    
    Returns:
    
    True if the timer is currently running.
  - isStopped
```
boolean isStopped()
```
    Has the timer been stopped?
    
    Returns:
    
    True if the timer has been stopped.
  - elapsed
```
Duration elapsed()
```
    What is the elapsed time of this timer?
    If the timer is running, this is the elapsed time since it was started, until the current time. If the timer has been stopped, this is the elapsed time from the moment it was started until the moment it was stopped. (When the timer has been stopped, this value does not change.)
    
    Returns:
    
    The amount of time that has elapsed since the timer was started.