MarshallingDecoder (Netty API Reference (4.1.22.Final))

java.lang.Object
- io.netty.channel.ChannelHandlerAdapter
- - io.netty.channel.ChannelInboundHandlerAdapter
  - - io.netty.handler.codec.ByteToMessageDecoder
    - - io.netty.handler.codec.LengthFieldBasedFrameDecoder
      - io.netty.handler.codec.marshalling.MarshallingDecoder

All Implemented Interfaces:

ChannelHandler ， ChannelInboundHandler
```
public class MarshallingDecoder
extends LengthFieldBasedFrameDecoder
```
解码器必须与MarshallingEncoder一起使用。一个LengthFieldBasedFrameDecoder其使用Unmarshaller读取对象出的ByteBuf 。

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
`MarshallingDecoder(UnmarshallerProvider provider)` 创建一个新的解码器，其最大对象大小为 `1048576`字节。
`MarshallingDecoder(UnmarshallerProvider provider, int maxObjectSize)` 用指定的最大对象大小创建一个新的解码器。

方法摘要

所有方法接口方法具体的方法
Modifier and Type	Method and Description
`protected java.lang.Object`	`decode(ChannelHandlerContext ctx, ByteBuf in)` 从`ByteBuf`中创建一个框架并将其返回。
`protected ByteBuf`	`extractFrame(ChannelHandlerContext ctx, ByteBuf buffer, int index, int length)` 提取指定缓冲区的子区域。

Methods inherited from class io.netty.handler.codec.LengthFieldBasedFrameDecoder
decode, getUnadjustedFrameLength

Methods inherited from class io.netty.handler.codec.ByteToMessageDecoder
actualReadableBytes, callDecode, 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
  - MarshallingDecoder
```
public MarshallingDecoder(UnmarshallerProvider provider)
```
    创建一个新的解码器，其最大对象大小为1048576字节。如果接收到的对象的大小大于1048576字节，则会引发StreamCorruptedException 。
  - MarshallingDecoder
```
public MarshallingDecoder(UnmarshallerProvider provider,
                          int maxObjectSize)
```
    用指定的最大对象大小创建一个新的解码器。
    
    参数
    
    maxObjectSize - 序列化对象的最大字节长度。如果接收到的对象的长度大于此值，则会引发TooLongFrameException 。
- 方法详细信息
  - decode
```
protected java.lang.Object decode(ChannelHandlerContext ctx,
                                  ByteBuf in)
                           throws java.lang.Exception
```
    从类复制的描述： LengthFieldBasedFrameDecoder
    
    从ByteBuf中创建一个框架并将其返回。
    
    重写：
    
    decode在课程 LengthFieldBasedFrameDecoder
    
    参数
    
    ctx - 这是ByteToMessageDecoder所属的ChannelHandlerContext
    
    in - 从中读取数据的ByteBuf
    
    结果
    
    如果没有帧可被创建，则帧ByteBuf表示帧或null 。
    
    异常
    
    java.lang.Exception
  - extractFrame
```
protected ByteBuf extractFrame(ChannelHandlerContext ctx,
                               ByteBuf buffer,
                               int index,
                               int length)
```
    从类复制的描述： LengthFieldBasedFrameDecoder
    
    提取指定缓冲区的子区域。
    如果您确定在当前的LengthFieldBasedFrameDecoder.decode(ChannelHandlerContext, ByteBuf)调用返回后没有访问框架及其内容，您甚至可以通过返回切片的子区域（即return buffer.slice(index, length) ）来避免内存复制。将提取的帧转换为对象时通常很有用。请参阅源代码ObjectDecoder以了解如何覆盖此方法以避免内存复制。
    
    重写：
    
    extractFrame in class LengthFieldBasedFrameDecoder

Class MarshallingDecoder

Nested Class Summary

Nested classes/interfaces inherited from class io.netty.handler.codec.ByteToMessageDecoder

Nested classes/interfaces inherited from interface io.netty.channel.ChannelHandler

Field Summary

Fields inherited from class io.netty.handler.codec.ByteToMessageDecoder

构造方法摘要

方法摘要

Methods inherited from class io.netty.handler.codec.LengthFieldBasedFrameDecoder

Methods inherited from class io.netty.handler.codec.ByteToMessageDecoder

Methods inherited from class io.netty.channel.ChannelInboundHandlerAdapter

Methods inherited from class io.netty.channel.ChannelHandlerAdapter

Methods inherited from class java.lang.Object

Methods inherited from interface io.netty.channel.ChannelHandler

构造方法详细信息

MarshallingDecoder

MarshallingDecoder

方法详细信息

decode

extractFrame