com.facebook.bolts

Class CancellationToken

java.lang.Object

com.facebook.bolts.CancellationToken

public class CancellationToken
extends java.lang.Object

Propagates notification that operations should be canceled.

Create an instance of CancellationTokenSource and pass the token returned from CancellationTokenSource#getToken() to the asynchronous operation(s). Call CancellationTokenSource#cancel() to cancel the operations.

A CancellationToken can only be cancelled once - it should not be passed to future operations once cancelled.

See Also:

CancellationTokenSource, CancellationTokenSource.getToken(), CancellationTokenSource.cancel(), register(Runnable)

Method Summary

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

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Detail

isCancellationRequested

public boolean isCancellationRequested()

Returns:

true if the cancellation was requested from the source, false otherwise.

register

public CancellationTokenRegistration register(java.lang.Runnable action)

Registers a runnable that will be called when this CancellationToken is canceled. If this token is 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.

Returns:

a CancellationTokenRegistration instance that can be used to unregister the action.

throwIfCancellationRequested

public void throwIfCancellationRequested()
                                  throws java.util.concurrent.CancellationException

Throws:

java.util.concurrent.CancellationException - if this token has had cancellation requested. May be used to stop execution of a thread or runnable.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object