ChannelFutureListener (Netty API Reference (4.2.1.Final))

All Superinterfaces:

java.util.EventListener, GenericFutureListener<ChannelFuture>

All Known Implementing Classes:

ChannelPromiseAggregator, ChannelPromiseNotifier, DefaultHttp2ConnectionEncoder.FlowControlledBase, DelegatingChannelPromiseNotifier
```
public interface ChannelFutureListener
extends GenericFutureListener<ChannelFuture>
```
Listens to the result of a ChannelFuture. The result of the asynchronous Channel I/O operation is notified once this listener is added by calling ChannelFuture.addListener(GenericFutureListener).
Return the control to the caller quickly
GenericFutureListener.operationComplete(Future) is directly called by an I/O thread. Therefore, performing a time consuming task or a blocking operation in the handler method can cause an unexpected pause during I/O. If you need to perform a blocking operation on I/O completion, try to execute the operation in a different thread using a thread pool.

Field Summary

Fields
Modifier and Type	Field	Description
`static ChannelFutureListener`	`CLOSE`	A `ChannelFutureListener` that closes the `Channel` which is associated with the specified `ChannelFuture`.
`static ChannelFutureListener`	`CLOSE_ON_FAILURE`	A `ChannelFutureListener` that closes the `Channel` when the operation ended up with a failure or cancellation rather than a success.
`static ChannelFutureListener`	`FIRE_EXCEPTION_ON_FAILURE`	A `ChannelFutureListener` that forwards the `Throwable` of the `ChannelFuture` into the `ChannelPipeline`.

Method Summary
- Methods inherited from interface io.netty.util.concurrent.GenericFutureListener
  operationComplete

- Field Detail
  - CLOSE
```
static final ChannelFutureListener CLOSE
```
    A ChannelFutureListener that closes the Channel which is associated with the specified ChannelFuture.
  - CLOSE_ON_FAILURE
```
static final ChannelFutureListener CLOSE_ON_FAILURE
```
    A ChannelFutureListener that closes the Channel when the operation ended up with a failure or cancellation rather than a success.
  - FIRE_EXCEPTION_ON_FAILURE
```
static final ChannelFutureListener FIRE_EXCEPTION_ON_FAILURE
```
    A ChannelFutureListener that forwards the Throwable of the ChannelFuture into the ChannelPipeline. This mimics the old behavior of Netty 3.