MqttDecoder (Netty API Reference (4.1.22.Final))

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java.lang.Object
- io.netty.channel.ChannelHandlerAdapter
- - io.netty.channel.ChannelInboundHandlerAdapter
  - - io.netty.handler.codec.ByteToMessageDecoder
    - - io.netty.handler.codec.ReplayingDecoder<io.netty.handler.codec.mqtt.MqttDecoder.DecoderState>
      - io.netty.handler.codec.mqtt.MqttDecoder

All Implemented Interfaces:

ChannelHandler ， ChannelInboundHandler
```
public final class MqttDecoder
extends ReplayingDecoder<io.netty.handler.codec.mqtt.MqttDecoder.DecoderState>
```
解码来自字节的Mqtt消息，跟随 the MQTT protocol specification v3.1

Nested Class Summary
- Nested classes/interfaces inherited from class io.netty.handler.codec.ByteToMessageDecoder
  ByteToMessageDecoder.Cumulator
- Nested classes/interfaces inherited from interface io.netty.channel.ChannelHandler
  ChannelHandler.Sharable

Field Summary
- Fields inherited from class io.netty.handler.codec.ByteToMessageDecoder
  COMPOSITE_CUMULATOR, MERGE_CUMULATOR

构造方法摘要

构造方法
Constructor and Description
`MqttDecoder()`
`MqttDecoder(int maxBytesInMessage)`

方法摘要

所有方法接口方法具体的方法
Modifier and Type	Method and Description
`protected void`	`decode(ChannelHandlerContext ctx, ByteBuf buffer, java.util.List<java.lang.Object> out)` 解码从一个`ByteBuf`到另一个。

Methods inherited from class io.netty.handler.codec.ReplayingDecoder
callDecode, checkpoint, checkpoint, state, state

Methods inherited from class io.netty.handler.codec.ByteToMessageDecoder
actualReadableBytes, channelInactive, channelRead, channelReadComplete, decodeLast, discardSomeReadBytes, handlerRemoved, handlerRemoved0, internalBuffer, isSingleDecode, setCumulator, setDiscardAfterReads, setSingleDecode, userEventTriggered

Methods inherited from class io.netty.channel.ChannelInboundHandlerAdapter
channelActive, channelRegistered, channelUnregistered, channelWritabilityChanged, exceptionCaught

Methods inherited from class io.netty.channel.ChannelHandlerAdapter
ensureNotSharable, handlerAdded, isSharable

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface io.netty.channel.ChannelHandler
handlerAdded

- 构造方法详细信息
  - MqttDecoder
```
public MqttDecoder()
```
  - MqttDecoder
```
public MqttDecoder(int maxBytesInMessage)
```
- 方法详细信息
  - decode
```
protected void decode(ChannelHandlerContext ctx,
                      ByteBuf buffer,
                      java.util.List<java.lang.Object> out)
               throws java.lang.Exception
```
    从类复制的描述： ByteToMessageDecoder
    
    解码从一个ByteBuf到另一个。该方法将被调用，直到输入ByteBuf从此方法返回时没有任何可读的内容或直到从输入ByteBuf中没有读取任何内容。
    
    Specified by:
    
    decode在课堂上 ByteToMessageDecoder
    
    参数
    
    ctx - 这ByteToMessageDecoder所属的ChannelHandlerContext
    
    buffer - 从中读取数据的ByteBuf
    
    out - 应该添加解码消息的 List
    
    异常
    
    java.lang.Exception - 发生错误时抛出

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