| Package | Description | 
|---|---|
| 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 | Utility classes used across multiple packages. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | ChannelOption<T>A  ChannelOptionallows to configure aChannelConfigin a type-safe
 way. | 
| Modifier and Type | Interface and Description | 
|---|---|
| interface  | Constant<T extends Constant<T>>A singleton which is safe to compare via the  ==operator. | 
| class  | ConstantPool<T extends Constant<T>>A pool of  Constants. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | AbstractConstant<T extends AbstractConstant<T>>Base implementation of  Constant. | 
| class  | AttributeKey<T>Key which can be used to access  Attributeout of theAttributeMap. | 
| class  | SignalA special  Errorwhich is used to signal some state or request by throwing it. | 
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