CancellationToken 11.0.0 API

```
public class CancellationToken

                    
```
Propagates notification that operations should be canceled.
Create an instance of {@code CancellationTokenSource} and pass the token returned from {@code * CancellationTokenSource#getToken()} to the asynchronous operation(s). Call {@code * CancellationTokenSource#cancel()} to cancel the operations.
A {@code CancellationToken} can only be cancelled once - it should not be passed to future operations once cancelled.

Method Summary

Modifier and Type	Method	Description
`boolean`	`isCancellationRequested()`
`CancellationTokenRegistration`	`register(Runnable action)`	Registers a runnable that will be called when this CancellationToken is canceled.
`void`	`throwIfCancellationRequested()`
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - isCancellationRequested
```
 boolean isCancellationRequested()
```
  - register
```
 CancellationTokenRegistration register(Runnable action)
```
    Registers a runnable that will be called when this CancellationToken is canceled. If this tokenis already in the canceled state, the runnable will be run immediately and synchronously.
    
    Parameters:
    
    action - the runnable to be run when the token is cancelled.
  - throwIfCancellationRequested
```
 void throwIfCancellationRequested()
```
  - toString
```
 String toString()
```