| 程序包 | 说明 | 
|---|---|
| io.netty.channel | The core channel API which is asynchronous and event-driven abstraction of
 various transports such as a
 NIO Channel. | 
| io.netty.util.concurrent | Utility classes for concurrent / async tasks. | 
| 限定符和类型 | 类和说明 | 
|---|---|
| class  | DefaultChannelProgressivePromiseThe default  ChannelProgressivePromiseimplementation. | 
| class  | DefaultChannelPromiseThe default  ChannelPromiseimplementation. | 
| 限定符和类型 | 类和说明 | 
|---|---|
| class  | DefaultProgressivePromise<V> |