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.