Module java.base

Package java.nio.channels

Interface CompletionHandler<V,A>

Type Parameters:

V - The result type of the I/O operation

A - The type of the object attached to the I/O operation

public interface CompletionHandler<V,A>

A handler for consuming the result of an asynchronous I/O operation.

The asynchronous channels defined in this package allow a completion handler to be specified to consume the result of an asynchronous operation. The completed method is invoked when the I/O operation completes successfully. The failed method is invoked if the I/O operations fails. The implementations of these methods should complete in a timely manner so as to avoid keeping the invoking thread from dispatching to other completion handlers.

Since:

1.7

Method Summary

Modifier and Type	Method	Description
void	completed(V result, A attachment)	Invoked when an operation has completed.
void	failed(Throwable exc, A attachment)	Invoked when an operation fails.

Method Detail

completed

void completed(V result,
               A attachment)

Invoked when an operation has completed.

Parameters:

result - The result of the I/O operation.

attachment - The object attached to the I/O operation when it was initiated.

failed

void failed(Throwable exc,
            A attachment)

Invoked when an operation fails.

Parameters:

exc - The exception to indicate why the I/O operation failed

attachment - The object attached to the I/O operation when it was initiated.