V - The result type of the I/O operationA - The type of the object attached to the I/O operationpublic 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.
void completed(V result,
A attachment) Invoked when an operation has completed.
result - The result of the I/O operation.attachment - The object attached to the I/O operation when it was initiated.void failed(Throwable exc,
A attachment) Invoked when an operation fails.
exc - The exception to indicate why the I/O operation failedattachment - The object attached to the I/O operation when it was initiated.
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