added in API level 26

CompletionHandler

public interface CompletionHandler

java.nio.channels.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.

Summary

Public methods

abstract void completed(V result, A attachment)

Invoked when an operation has completed.

abstract void failed(Throwable exc, A attachment)

Invoked when an operation fails.

Public methods

completed

added in API level 26
public abstract void completed (V result, 
                A attachment)

Invoked when an operation has completed.

Parameters
result V: The result of the I/O operation.

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

failed

added in API level 26
public abstract void failed (Throwable exc, 
                A attachment)

Invoked when an operation fails.

Parameters
exc Throwable: The exception to indicate why the I/O operation failed

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