CompletionHandler

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

All Methods

Instance Methods

Abstract Methods
Modifier and Type	Method and 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.