IT. Expert System.

public final class CancellationSignal
extends Object

• Nested Class Summary

  Nested Classes

  Modifier and Type	Class and Description
  static interface	CancellationSignal.OnCancelListener Listens for cancellation.

• Constructor Summary

  Constructors

  Constructor and Description
  CancellationSignal() Creates a cancellation signal, initially not canceled.

• Method Summary

  Methods

  Modifier and Type	Method and Description
  void	cancel() Cancels the operation and signals the cancellation listener.
  static ICancellationSignal	createTransport() Creates a transport that can be returned back to the caller of a Binder function and subsequently used to dispatch a cancellation signal.
  static CancellationSignal	fromTransport(ICancellationSignal transport) Given a locally created transport, returns its associated cancellation signal.
  boolean	isCanceled() Returns true if the operation has been canceled.
  void	setOnCancelListener(CancellationSignal.OnCancelListener listener) Sets the cancellation listener to be called when canceled.
  void	setRemote(ICancellationSignal remote) Sets the remote transport.
  void	throwIfCanceled() Throws OperationCanceledException if the operation has been canceled.

  • Methods inherited from class java.lang.Object

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

• Constructor Detail

  • CancellationSignal

    public CancellationSignal()

    Creates a cancellation signal, initially not canceled.

• Method Detail

  • isCanceled

    public boolean isCanceled()

    Returns true if the operation has been canceled.

    Returns:

    True if the operation has been canceled.

  • throwIfCanceled

    public void throwIfCanceled()

    Throws OperationCanceledException if the operation has been canceled.

    Throws:

    OperationCanceledException - if the operation has been canceled.

  • cancel

    public void cancel()

    Cancels the operation and signals the cancellation listener. If the operation has not yet started, then it will be canceled as soon as it does.

  • setOnCancelListener

    public void setOnCancelListener(CancellationSignal.OnCancelListener listener)

    Sets the cancellation listener to be called when canceled. This method is intended to be used by the recipient of a cancellation signal such as a database or a content provider to handle cancellation requests while performing a long-running operation. This method is not intended to be used by applications themselves. If cancel() has already been called, then the provided listener is invoked immediately. This method is guaranteed that the listener will not be called after it has been removed.

    Parameters:

    listener - The cancellation listener, or null to remove the current listener.

  • setRemote

    public void setRemote(ICancellationSignal remote)

    Sets the remote transport. If cancel() has already been called, then the provided remote transport is canceled immediately. This method is guaranteed that the remote transport will not be called after it has been removed.

    Parameters:

    remote - The remote transport, or null to remove.

  • createTransport

    public static ICancellationSignal createTransport()

    Creates a transport that can be returned back to the caller of a Binder function and subsequently used to dispatch a cancellation signal.

    Returns:

    The new cancellation signal transport.

  • fromTransport

    public static CancellationSignal fromTransport(ICancellationSignal transport)

    Given a locally created transport, returns its associated cancellation signal.

    Parameters:

    transport - The locally created transport, or null if none.

    Returns:

    The associated cancellation signal, or null if none.