IoRegistration (Netty API Reference (4.2.1.Final))

```
public interface IoRegistration
```
A registration for IO.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`<T> T`	`attachment()`	Implementation specific attachment, which might be `null`.
`boolean`	`cancel()`	Cancel the registration.
`boolean`	`isValid()`	Returns `true` if the registration is still valid.
`long`	`submit(IoOps ops)`	Submit the `IoOps` to the registration.

- Method Detail
  - attachment
```
<T> T attachment()
```
    Implementation specific attachment, which might be null.
    
    Returns:
    
    attachment.
  - submit
```
long submit(IoOps ops)
```
    Submit the IoOps to the registration.
    
    Parameters:
    
    ops - ops.
    
    Returns:
    
    an identifier for the operation, which might be unique or not (depending on the implementation).
  - isValid
```
boolean isValid()
```
    Returns true if the registration is still valid. Once cancel() is called this will return false.
    
    Returns:
    
    valid.
  - cancel
```
boolean cancel()
```
    Cancel the registration.
    
    Returns:
    
    true if cancellation was successful, false otherwise.