io.netty.handler.codec.http.websocketx

Class WebSocketClientHandshaker

java.lang.Object

io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker

Direct Known Subclasses:

WebSocketClientHandshaker00, WebSocketClientHandshaker07, WebSocketClientHandshaker08, WebSocketClientHandshaker13

public abstract class WebSocketClientHandshaker
extends Object

Base class for web socket client handshake implementations

Field Summary

Fields

Modifier and Type	Field and Description
protected HttpHeaders	customHeaders

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	WebSocketClientHandshaker(URI uri, WebSocketVersion version, String subprotocol, HttpHeaders customHeaders, int maxFramePayloadLength) Base constructor

Method Summary

Modifier and Type	Method and Description
String	actualSubprotocol() Returns the subprotocol response sent by the server.
ChannelFuture	close(Channel channel, CloseWebSocketFrame frame) Performs the closing handshake
ChannelFuture	close(Channel channel, CloseWebSocketFrame frame, ChannelPromise promise) Performs the closing handshake
String	expectedSubprotocol() Returns the CSV of requested subprotocol(s) sent to the server as specified in the constructor
void	finishHandshake(Channel channel, FullHttpResponse response) Validates and finishes the opening handshake initiated by handshake(io.netty.channel.Channel)}.
ChannelFuture	handshake(Channel channel) Begins the opening handshake
ChannelFuture	handshake(Channel channel, ChannelPromise promise) Begins the opening handshake
boolean	isHandshakeComplete() Flag to indicate if the opening handshake is complete
int	maxFramePayloadLength() Returns the max length for any frame's payload
protected abstract FullHttpRequest	newHandshakeRequest() Returns a new {@link FullHttpRequest) which will be used for the handshake.
protected abstract WebSocketFrameDecoder	newWebsocketDecoder() Returns the decoder to use after handshake is complete.
protected abstract WebSocketFrameEncoder	newWebSocketEncoder() Returns the encoder to use after the handshake is complete.
ChannelFuture	processHandshake(Channel channel, HttpResponse response) Process the opening handshake initiated by handshake(io.netty.channel.Channel)}.
ChannelFuture	processHandshake(Channel channel, HttpResponse response, ChannelPromise promise) Process the opening handshake initiated by handshake(io.netty.channel.Channel)}.
URI	uri() Returns the URI to the web socket. e.g.
protected abstract void	verify(FullHttpResponse response) Verify the FullHttpResponse and throws a WebSocketHandshakeException if something is wrong.
WebSocketVersion	version() Version of the web socket specification that is being used

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

customHeaders

protected final HttpHeaders customHeaders

Constructor Detail

WebSocketClientHandshaker

protected WebSocketClientHandshaker(URI uri,
                                    WebSocketVersion version,
                                    String subprotocol,
                                    HttpHeaders customHeaders,
                                    int maxFramePayloadLength)

Base constructor

Parameters:

uri - 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

Method Detail

uri

public URI uri()

Returns the URI to the web socket. e.g. "ws://myhost.com/path"

version

public WebSocketVersion version()

Version of the web socket specification that is being used

maxFramePayloadLength

public int maxFramePayloadLength()

Returns the max length for any frame's payload

isHandshakeComplete

public boolean isHandshakeComplete()

Flag to indicate if the opening handshake is complete

expectedSubprotocol

public String expectedSubprotocol()

Returns the CSV of requested subprotocol(s) sent to the server as specified in the constructor

actualSubprotocol

public String actualSubprotocol()

Returns the subprotocol response sent by the server. Only available after end of handshake. Null if no subprotocol was requested or confirmed by the server.

handshake

public ChannelFuture handshake(Channel channel)

Begins the opening handshake

Parameters:

channel - Channel

handshake

public final ChannelFuture handshake(Channel channel,
                                     ChannelPromise promise)

Begins the opening handshake

Parameters:

channel - Channel

promise - the ChannelPromise to be notified when the opening handshake is sent

newHandshakeRequest

protected abstract FullHttpRequest newHandshakeRequest()

Returns a new {@link FullHttpRequest) which will be used for the handshake.

finishHandshake

public final void finishHandshake(Channel channel,
                                  FullHttpResponse response)

Validates and finishes the opening handshake initiated by handshake(io.netty.channel.Channel)}.

Parameters:

channel - Channel

response - HTTP response containing the closing handshake details

processHandshake

public final ChannelFuture processHandshake(Channel channel,
                                            HttpResponse response)

Process the opening handshake initiated by handshake(io.netty.channel.Channel)}.

Parameters:

channel - Channel

response - HTTP response containing the closing handshake details

Returns:

future the ChannelFuture which is notified once the handshake completes.

processHandshake

public final ChannelFuture processHandshake(Channel channel,
                                            HttpResponse response,
                                            ChannelPromise promise)

Process the opening handshake initiated by handshake(io.netty.channel.Channel)}.

Parameters:

channel - Channel

response - HTTP response containing the closing handshake details

promise - the ChannelPromise to notify once the handshake completes.

Returns:

future the ChannelFuture which is notified once the handshake completes.

verify

protected abstract void verify(FullHttpResponse response)

Verify the FullHttpResponse and throws a WebSocketHandshakeException if something is wrong.

newWebsocketDecoder

protected abstract WebSocketFrameDecoder newWebsocketDecoder()

Returns the decoder to use after handshake is complete.

newWebSocketEncoder

protected abstract WebSocketFrameEncoder newWebSocketEncoder()

Returns the encoder to use after the handshake is complete.

close

public ChannelFuture close(Channel channel,
                           CloseWebSocketFrame frame)

Performs the closing handshake

Parameters:

channel - Channel

frame - Closing Frame that was received

close

public ChannelFuture close(Channel channel,
                           CloseWebSocketFrame frame,
                           ChannelPromise promise)

Performs the closing handshake

Parameters:

channel - Channel

frame - Closing Frame that was received

promise - the ChannelPromise to be notified when the closing handshake is done