CancellationToken (common 0.9.0 API)

java.lang.Object
- io.pravega.common.concurrent.CancellationToken

```
@ThreadSafe
public class CancellationToken
extends java.lang.Object
```
Represents a token that can be passed around to various services or components to indicate when a task should be cancelled.

Field Summary

Fields
Modifier and Type Field Description

static CancellationToken NONE
A CancellationToken that can be used as a placeholder for "no token to pass".

Constructor Summary

Constructors
Constructor Description

CancellationToken()
Creates a new instance of the CancellationToken class.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`isCancellationRequested()`
`<T> void`	`register(java.util.concurrent.CompletableFuture<T> future)`	Registers the given Future to the token.
`void`	`requestCancellation()`	Cancels all registered futures.
`java.lang.String`	`toString()`

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

- Field Detail
  - NONE
```
public static final CancellationToken NONE
```
    A CancellationToken that can be used as a placeholder for "no token to pass". This token instance cannot be cancelled.
- Constructor Detail
  - CancellationToken
```
public CancellationToken()
```
    Creates a new instance of the CancellationToken class.
- Method Detail
  - register
```
public <T> void register(java.util.concurrent.CompletableFuture<T> future)
```
    Registers the given Future to the token.
    
    Type Parameters:
    
    T - Return type of the future.
    
    Parameters:
    
    future - The Future to register.
  - requestCancellation
```
public void requestCancellation()
```
    Cancels all registered futures.
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class java.lang.Object
  - isCancellationRequested
```
public boolean isCancellationRequested()
```