WebSocketClientExtensionHandler (Netty/Codec/HTTP 4.2.0.Alpha1 API)

java.lang.Object
- io.netty.channel.ChannelHandlerAdapter
- - io.netty.channel.ChannelInboundHandlerAdapter
  - - io.netty.channel.ChannelDuplexHandler
    - - io.netty.handler.codec.http.websocketx.extensions.WebSocketClientExtensionHandler

All Implemented Interfaces:

io.netty.channel.ChannelHandler, io.netty.channel.ChannelInboundHandler, io.netty.channel.ChannelOutboundHandler

Direct Known Subclasses:

WebSocketClientCompressionHandler
```
public class WebSocketClientExtensionHandler
extends io.netty.channel.ChannelDuplexHandler
```
This handler negotiates and initializes the WebSocket Extensions. This implementation negotiates the extension with the server in a defined order, ensures that the successfully negotiated extensions are consistent between them, and initializes the channel pipeline with the extension decoder and encoder. Find a basic implementation for compression extensions at io.netty.handler.codec.http.websocketx.extensions.compression.WebSocketClientCompressionHandler.

Nested Class Summary
- Nested classes/interfaces inherited from interface io.netty.channel.ChannelHandler
  io.netty.channel.ChannelHandler.Sharable

Constructor Summary

Constructors
Constructor Description

WebSocketClientExtensionHandler(WebSocketClientExtensionHandshaker... extensionHandshakers)
Constructor

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`channelRead(io.netty.channel.ChannelHandlerContext ctx, Object msg)`
`void`	`write(io.netty.channel.ChannelHandlerContext ctx, Object msg, io.netty.channel.ChannelPromise promise)`

Methods inherited from class io.netty.channel.ChannelDuplexHandler
bind, close, connect, deregister, disconnect, flush, read

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

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

- Constructor Detail
  - WebSocketClientExtensionHandler
```
public WebSocketClientExtensionHandler(WebSocketClientExtensionHandshaker... extensionHandshakers)
```
    Constructor
    
    Parameters:
    
    extensionHandshakers - The extension handshaker in priority order. A handshaker could be repeated many times with fallback configuration.
- Method Detail
  - write
```
public void write(io.netty.channel.ChannelHandlerContext ctx,
                  Object msg,
                  io.netty.channel.ChannelPromise promise)
           throws Exception
```
    Specified by:
    
    write in interface io.netty.channel.ChannelOutboundHandler
    
    Overrides:
    
    write in class io.netty.channel.ChannelDuplexHandler
    
    Throws:
    
    Exception
  - channelRead
```
public void channelRead(io.netty.channel.ChannelHandlerContext ctx,
                        Object msg)
                 throws Exception
```
    Specified by:
    
    channelRead in interface io.netty.channel.ChannelInboundHandler
    
    Overrides:
    
    channelRead in class io.netty.channel.ChannelInboundHandlerAdapter
    
    Throws:
    
    Exception