io.netty.handler.codec.http.websocketx

Class WebSocketClientProtocolHandler

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.channel.ChannelInboundHandlerAdapter

io.netty.handler.codec.MessageToMessageDecoder<WebSocketFrame>

io.netty.handler.codec.http.websocketx.WebSocketClientProtocolHandler

All Implemented Interfaces:

ChannelHandler, ChannelInboundHandler, ChannelOutboundHandler

public class WebSocketClientProtocolHandler
extends MessageToMessageDecoder<WebSocketFrame>

This handler does all the heavy lifting for you to run a websocket client. It takes care of websocket handshaking as well as processing of Ping, Pong frames. Text and Binary data frames are passed to the next handler in the pipeline (implemented by you) for processing. Also the close frame is passed to the next handler as you may want inspect it before close the connection if the handleCloseFrames is false, default is true. This implementation will establish the websocket connection once the connection to the remote server was complete. To know once a handshake was done you can intercept the ChannelInboundHandler.userEventTriggered(ChannelHandlerContext, Object) and check if the event was of type WebSocketClientProtocolHandler.ClientHandshakeStateEvent.HANDSHAKE_ISSUED or WebSocketClientProtocolHandler.ClientHandshakeStateEvent.HANDSHAKE_COMPLETE.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	WebSocketClientProtocolHandler.ClientHandshakeStateEvent Events that are fired to notify about handshake status

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

ChannelHandler.Sharable

Constructor Summary

Constructors

Constructor and Description
WebSocketClientProtocolHandler(URI webSocketURL, WebSocketVersion version, String subprotocol, boolean allowExtensions, HttpHeaders customHeaders, int maxFramePayloadLength) Base constructor
WebSocketClientProtocolHandler(URI webSocketURL, WebSocketVersion version, String subprotocol, boolean allowExtensions, HttpHeaders customHeaders, int maxFramePayloadLength, boolean handleCloseFrames) Base constructor
WebSocketClientProtocolHandler(URI webSocketURL, WebSocketVersion version, String subprotocol, boolean allowExtensions, HttpHeaders customHeaders, int maxFramePayloadLength, boolean handleCloseFrames, boolean performMasking, boolean allowMaskMismatch) Base constructor
WebSocketClientProtocolHandler(URI webSocketURL, WebSocketVersion version, String subprotocol, boolean allowExtensions, HttpHeaders customHeaders, int maxFramePayloadLength, boolean handleCloseFrames, boolean performMasking, boolean allowMaskMismatch, long handshakeTimeoutMillis) Base constructor
WebSocketClientProtocolHandler(URI webSocketURL, WebSocketVersion version, String subprotocol, boolean allowExtensions, HttpHeaders customHeaders, int maxFramePayloadLength, boolean handleCloseFrames, long handshakeTimeoutMillis) Base constructor
WebSocketClientProtocolHandler(URI webSocketURL, WebSocketVersion version, String subprotocol, boolean allowExtensions, HttpHeaders customHeaders, int maxFramePayloadLength, long handshakeTimeoutMillis) Base constructor
WebSocketClientProtocolHandler(WebSocketClientHandshaker handshaker) Base constructor
WebSocketClientProtocolHandler(WebSocketClientHandshaker handshaker, boolean handleCloseFrames) Base constructor
WebSocketClientProtocolHandler(WebSocketClientHandshaker handshaker, boolean handleCloseFrames, boolean dropPongFrames) Base constructor
WebSocketClientProtocolHandler(WebSocketClientHandshaker handshaker, boolean handleCloseFrames, boolean dropPongFrames, long handshakeTimeoutMillis) Base constructor
WebSocketClientProtocolHandler(WebSocketClientHandshaker handshaker, boolean handleCloseFrames, boolean dropPongFrames, long handshakeTimeoutMillis, boolean withUTF8Validator) Base constructor
WebSocketClientProtocolHandler(WebSocketClientHandshaker handshaker, boolean handleCloseFrames, long handshakeTimeoutMillis) Base constructor
WebSocketClientProtocolHandler(WebSocketClientHandshaker handshaker, long handshakeTimeoutMillis) Base constructor
WebSocketClientProtocolHandler(WebSocketClientHandshaker handshaker, WebSocketClientProtocolConfig clientConfig) Base constructor
WebSocketClientProtocolHandler(WebSocketClientProtocolConfig clientConfig) Base constructor

Method Summary

Modifier and Type	Method and Description
void	bind(ChannelHandlerContext ctx, SocketAddress localAddress, ChannelPromise promise) Called once a bind operation is made.
protected WebSocketClientHandshakeException	buildHandshakeException(String message) Returns a WebSocketHandshakeException that depends on which client or server pipeline this handler belongs.
void	close(ChannelHandlerContext ctx, ChannelPromise promise) Called once a close operation is made.
void	connect(ChannelHandlerContext ctx, SocketAddress remoteAddress, SocketAddress localAddress, ChannelPromise promise) Called once a connect operation is made.
protected void	decode(ChannelHandlerContext ctx, WebSocketFrame frame, List<Object> out) Decode from one message to an other.
void	deregister(ChannelHandlerContext ctx, ChannelPromise promise) Called once a deregister operation is made from the current registered EventLoop.
void	disconnect(ChannelHandlerContext ctx, ChannelPromise promise) Called once a disconnect operation is made.
void	exceptionCaught(ChannelHandlerContext ctx, Throwable cause) Calls ChannelHandlerContext.fireExceptionCaught(Throwable) to forward to the next ChannelHandler in the ChannelPipeline.
void	flush(ChannelHandlerContext ctx) Called once a flush operation is made.
void	handlerAdded(ChannelHandlerContext ctx) Do nothing by default, sub-classes may override this method.
WebSocketClientHandshaker	handshaker() Returns the used handshaker
void	read(ChannelHandlerContext ctx) Intercepts ChannelHandlerContext.read().
void	write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) Called once a write operation is made.

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

acceptInboundMessage, channelRead, channelReadComplete

Methods inherited from class io.netty.channel.ChannelInboundHandlerAdapter

channelActive, channelInactive, channelRegistered, channelUnregistered, channelWritabilityChanged, userEventTriggered

Methods inherited from class io.netty.channel.ChannelHandlerAdapter

ensureNotSharable, 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

handlerRemoved

Constructor Detail

WebSocketClientProtocolHandler

public WebSocketClientProtocolHandler(WebSocketClientProtocolConfig clientConfig)

Base constructor

Parameters:

clientConfig - Client protocol configuration.

WebSocketClientProtocolHandler

public WebSocketClientProtocolHandler(WebSocketClientHandshaker handshaker,
                                      WebSocketClientProtocolConfig clientConfig)

Base constructor

Parameters:

handshaker - The WebSocketClientHandshaker which will be used to issue the handshake once the connection was established to the remote peer.

clientConfig - Client protocol configuration.

WebSocketClientProtocolHandler

public WebSocketClientProtocolHandler(URI webSocketURL,
                                      WebSocketVersion version,
                                      String subprotocol,
                                      boolean allowExtensions,
                                      HttpHeaders customHeaders,
                                      int maxFramePayloadLength,
                                      boolean handleCloseFrames,
                                      boolean performMasking,
                                      boolean allowMaskMismatch)

Base constructor

Parameters:

webSocketURL - URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be sent to this URL.

version - Version of web socket specification to use to connect to the server

subprotocol - Sub protocol request sent to the server.

customHeaders - Map of custom headers to add to the client request

maxFramePayloadLength - Maximum length of a frame's payload

handleCloseFrames - true if close frames should not be forwarded and just close the channel

performMasking - Whether to mask all written websocket frames. This must be set to true in order to be fully compatible with the websocket specifications. Client applications that communicate with a non-standard server which doesn't require masking might set this to false to achieve a higher performance.

allowMaskMismatch - When set to true, frames which are not masked properly according to the standard will still be accepted.

WebSocketClientProtocolHandler

public WebSocketClientProtocolHandler(URI webSocketURL,
                                      WebSocketVersion version,
                                      String subprotocol,
                                      boolean allowExtensions,
                                      HttpHeaders customHeaders,
                                      int maxFramePayloadLength,
                                      boolean handleCloseFrames,
                                      boolean performMasking,
                                      boolean allowMaskMismatch,
                                      long handshakeTimeoutMillis)

Base constructor

Parameters:

webSocketURL - URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be sent to this URL.

version - Version of web socket specification to use to connect to the server

subprotocol - Sub protocol request sent to the server.

customHeaders - Map of custom headers to add to the client request

maxFramePayloadLength - Maximum length of a frame's payload

handleCloseFrames - true if close frames should not be forwarded and just close the channel

performMasking - Whether to mask all written websocket frames. This must be set to true in order to be fully compatible with the websocket specifications. Client applications that communicate with a non-standard server which doesn't require masking might set this to false to achieve a higher performance.

allowMaskMismatch - When set to true, frames which are not masked properly according to the standard will still be accepted.

handshakeTimeoutMillis - Handshake timeout in mills, when handshake timeout, will trigger user event WebSocketClientProtocolHandler.ClientHandshakeStateEvent.HANDSHAKE_TIMEOUT

WebSocketClientProtocolHandler

public WebSocketClientProtocolHandler(URI webSocketURL,
                                      WebSocketVersion version,
                                      String subprotocol,
                                      boolean allowExtensions,
                                      HttpHeaders customHeaders,
                                      int maxFramePayloadLength,
                                      boolean handleCloseFrames)

Base constructor

Parameters:

webSocketURL - URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be sent to this URL.

version - Version of web socket specification to use to connect to the server

subprotocol - Sub protocol request sent to the server.

customHeaders - Map of custom headers to add to the client request

maxFramePayloadLength - Maximum length of a frame's payload

handleCloseFrames - true if close frames should not be forwarded and just close the channel

WebSocketClientProtocolHandler

public WebSocketClientProtocolHandler(URI webSocketURL,
                                      WebSocketVersion version,
                                      String subprotocol,
                                      boolean allowExtensions,
                                      HttpHeaders customHeaders,
                                      int maxFramePayloadLength,
                                      boolean handleCloseFrames,
                                      long handshakeTimeoutMillis)

Base constructor

Parameters:

webSocketURL - URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be sent to this URL.

version - Version of web socket specification to use to connect to the server

subprotocol - Sub protocol request sent to the server.

customHeaders - Map of custom headers to add to the client request

maxFramePayloadLength - Maximum length of a frame's payload

handleCloseFrames - true if close frames should not be forwarded and just close the channel

handshakeTimeoutMillis - Handshake timeout in mills, when handshake timeout, will trigger user event WebSocketClientProtocolHandler.ClientHandshakeStateEvent.HANDSHAKE_TIMEOUT

WebSocketClientProtocolHandler

public WebSocketClientProtocolHandler(URI webSocketURL,
                                      WebSocketVersion version,
                                      String subprotocol,
                                      boolean allowExtensions,
                                      HttpHeaders customHeaders,
                                      int maxFramePayloadLength)

Base constructor

Parameters:

webSocketURL - URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be sent to this URL.

version - Version of web socket specification to use to connect to the server

subprotocol - Sub protocol request sent to the server.

customHeaders - Map of custom headers to add to the client request

maxFramePayloadLength - Maximum length of a frame's payload

WebSocketClientProtocolHandler

public WebSocketClientProtocolHandler(URI webSocketURL,
                                      WebSocketVersion version,
                                      String subprotocol,
                                      boolean allowExtensions,
                                      HttpHeaders customHeaders,
                                      int maxFramePayloadLength,
                                      long handshakeTimeoutMillis)

Base constructor

Parameters:

webSocketURL - URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be sent to this URL.

version - Version of web socket specification to use to connect to the server

subprotocol - Sub protocol request sent to the server.

customHeaders - Map of custom headers to add to the client request

maxFramePayloadLength - Maximum length of a frame's payload

handshakeTimeoutMillis - Handshake timeout in mills, when handshake timeout, will trigger user event WebSocketClientProtocolHandler.ClientHandshakeStateEvent.HANDSHAKE_TIMEOUT

WebSocketClientProtocolHandler

public WebSocketClientProtocolHandler(WebSocketClientHandshaker handshaker,
                                      boolean handleCloseFrames)

Base constructor

Parameters:

handshaker - The WebSocketClientHandshaker which will be used to issue the handshake once the connection was established to the remote peer.

handleCloseFrames - true if close frames should not be forwarded and just close the channel

WebSocketClientProtocolHandler

public WebSocketClientProtocolHandler(WebSocketClientHandshaker handshaker,
                                      boolean handleCloseFrames,
                                      long handshakeTimeoutMillis)

Base constructor

Parameters:

handshaker - The WebSocketClientHandshaker which will be used to issue the handshake once the connection was established to the remote peer.

handleCloseFrames - true if close frames should not be forwarded and just close the channel

handshakeTimeoutMillis - Handshake timeout in mills, when handshake timeout, will trigger user event WebSocketClientProtocolHandler.ClientHandshakeStateEvent.HANDSHAKE_TIMEOUT

WebSocketClientProtocolHandler

public WebSocketClientProtocolHandler(WebSocketClientHandshaker handshaker,
                                      boolean handleCloseFrames,
                                      boolean dropPongFrames)

Base constructor

Parameters:

handshaker - The WebSocketClientHandshaker which will be used to issue the handshake once the connection was established to the remote peer.

handleCloseFrames - true if close frames should not be forwarded and just close the channel

dropPongFrames - true if pong frames should not be forwarded

WebSocketClientProtocolHandler

public WebSocketClientProtocolHandler(WebSocketClientHandshaker handshaker,
                                      boolean handleCloseFrames,
                                      boolean dropPongFrames,
                                      long handshakeTimeoutMillis)

Base constructor

Parameters:

handshaker - The WebSocketClientHandshaker which will be used to issue the handshake once the connection was established to the remote peer.

handleCloseFrames - true if close frames should not be forwarded and just close the channel

dropPongFrames - true if pong frames should not be forwarded

handshakeTimeoutMillis - Handshake timeout in mills, when handshake timeout, will trigger user event WebSocketClientProtocolHandler.ClientHandshakeStateEvent.HANDSHAKE_TIMEOUT

WebSocketClientProtocolHandler

public WebSocketClientProtocolHandler(WebSocketClientHandshaker handshaker,
                                      boolean handleCloseFrames,
                                      boolean dropPongFrames,
                                      long handshakeTimeoutMillis,
                                      boolean withUTF8Validator)

Base constructor

Parameters:

handshaker - The WebSocketClientHandshaker which will be used to issue the handshake once the connection was established to the remote peer.

handleCloseFrames - true if close frames should not be forwarded and just close the channel

dropPongFrames - true if pong frames should not be forwarded

handshakeTimeoutMillis - Handshake timeout in mills, when handshake timeout, will trigger user event WebSocketClientProtocolHandler.ClientHandshakeStateEvent.HANDSHAKE_TIMEOUT

withUTF8Validator - true if UTF8 validation of text frames should be enabled

WebSocketClientProtocolHandler

public WebSocketClientProtocolHandler(WebSocketClientHandshaker handshaker)

Base constructor

Parameters:

handshaker - The WebSocketClientHandshaker which will be used to issue the handshake once the connection was established to the remote peer.

WebSocketClientProtocolHandler

public WebSocketClientProtocolHandler(WebSocketClientHandshaker handshaker,
                                      long handshakeTimeoutMillis)

Base constructor

Parameters:

handshaker - The WebSocketClientHandshaker which will be used to issue the handshake once the connection was established to the remote peer.

handshakeTimeoutMillis - Handshake timeout in mills, when handshake timeout, will trigger user event WebSocketClientProtocolHandler.ClientHandshakeStateEvent.HANDSHAKE_TIMEOUT

Method Detail

handshaker

public WebSocketClientHandshaker handshaker()

Returns the used handshaker

decode

protected void decode(ChannelHandlerContext ctx,
                      WebSocketFrame frame,
                      List<Object> out)
               throws Exception

Description copied from class: MessageToMessageDecoder

Decode from one message to an other. This method will be called for each written message that can be handled by this decoder.

Parameters:

ctx - the ChannelHandlerContext which this MessageToMessageDecoder belongs to

frame - the message to decode to an other one

out - the List to which decoded messages should be added

Throws:

Exception - is thrown if an error occurs

buildHandshakeException

protected WebSocketClientHandshakeException buildHandshakeException(String message)

Returns a WebSocketHandshakeException that depends on which client or server pipeline this handler belongs. Should be overridden in implementation otherwise a default exception is used.

handlerAdded

public void handlerAdded(ChannelHandlerContext ctx)

Description copied from class: ChannelHandlerAdapter

Do nothing by default, sub-classes may override this method.

Specified by:

handlerAdded in interface ChannelHandler

Overrides:

handlerAdded in class ChannelHandlerAdapter

close

public void close(ChannelHandlerContext ctx,
                  ChannelPromise promise)
           throws Exception

Description copied from interface: ChannelOutboundHandler

Called once a close operation is made.

Specified by:

close in interface ChannelOutboundHandler

Parameters:

ctx - the ChannelHandlerContext for which the close operation is made

promise - the ChannelPromise to notify once the operation completes

Throws:

Exception - thrown if an error occurs

write

public void write(ChannelHandlerContext ctx,
                  Object msg,
                  ChannelPromise promise)
           throws Exception

Description copied from interface: ChannelOutboundHandler

Called once a write operation is made. The write operation will write the messages through the ChannelPipeline. Those are then ready to be flushed to the actual Channel once Channel.flush() is called

Specified by:

write in interface ChannelOutboundHandler

Parameters:

ctx - the ChannelHandlerContext for which the write operation is made

msg - the message to write

promise - the ChannelPromise to notify once the operation completes

Throws:

Exception - thrown if an error occurs

bind

public void bind(ChannelHandlerContext ctx,
                 SocketAddress localAddress,
                 ChannelPromise promise)
          throws Exception

Description copied from interface: ChannelOutboundHandler

Called once a bind operation is made.

Specified by:

bind in interface ChannelOutboundHandler

Parameters:

ctx - the ChannelHandlerContext for which the bind operation is made

localAddress - the SocketAddress to which it should bound

promise - the ChannelPromise to notify once the operation completes

Throws:

Exception - thrown if an error occurs

connect

public void connect(ChannelHandlerContext ctx,
                    SocketAddress remoteAddress,
                    SocketAddress localAddress,
                    ChannelPromise promise)
             throws Exception

Description copied from interface: ChannelOutboundHandler

Called once a connect operation is made.

Specified by:

connect in interface ChannelOutboundHandler

Parameters:

ctx - the ChannelHandlerContext for which the connect operation is made

remoteAddress - the SocketAddress to which it should connect

localAddress - the SocketAddress which is used as source on connect

promise - the ChannelPromise to notify once the operation completes

Throws:

Exception - thrown if an error occurs

disconnect

public void disconnect(ChannelHandlerContext ctx,
                       ChannelPromise promise)
                throws Exception

Description copied from interface: ChannelOutboundHandler

Called once a disconnect operation is made.

Specified by:

disconnect in interface ChannelOutboundHandler

Parameters:

ctx - the ChannelHandlerContext for which the disconnect operation is made

promise - the ChannelPromise to notify once the operation completes

Throws:

Exception - thrown if an error occurs

deregister

public void deregister(ChannelHandlerContext ctx,
                       ChannelPromise promise)
                throws Exception

Description copied from interface: ChannelOutboundHandler

Called once a deregister operation is made from the current registered EventLoop.

Specified by:

deregister in interface ChannelOutboundHandler

Parameters:

ctx - the ChannelHandlerContext for which the close operation is made

promise - the ChannelPromise to notify once the operation completes

Throws:

Exception - thrown if an error occurs

read

public void read(ChannelHandlerContext ctx)
          throws Exception

Description copied from interface: ChannelOutboundHandler

Intercepts ChannelHandlerContext.read().

Specified by:

read in interface ChannelOutboundHandler

Throws:

Exception

flush

public void flush(ChannelHandlerContext ctx)
           throws Exception

Description copied from interface: ChannelOutboundHandler

Called once a flush operation is made. The flush operation will try to flush out all previous written messages that are pending.

Specified by:

flush in interface ChannelOutboundHandler

Parameters:

ctx - the ChannelHandlerContext for which the flush operation is made

Throws:

Exception - thrown if an error occurs

exceptionCaught

public void exceptionCaught(ChannelHandlerContext ctx,
                            Throwable cause)
                     throws Exception

Description copied from class: ChannelInboundHandlerAdapter

Calls ChannelHandlerContext.fireExceptionCaught(Throwable) to forward to the next ChannelHandler in the ChannelPipeline. Sub-classes may override this method to change behavior.

Specified by:

exceptionCaught in interface ChannelHandler

Specified by:

exceptionCaught in interface ChannelInboundHandler

Overrides:

exceptionCaught in class ChannelInboundHandlerAdapter

Throws:

Exception