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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 Details

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.

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https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/nio/channels/CompletionHandler.html