Package org.springframework.web.socket.handler

Class WebSocketHandlerDecorator

java.lang.Object

org.springframework.web.socket.handler.WebSocketHandlerDecorator

All Implemented Interfaces:

WebSocketHandler

Direct Known Subclasses:

ExceptionWebSocketHandlerDecorator, LoggingWebSocketHandlerDecorator

public class WebSocketHandlerDecorator
extends Object
implements WebSocketHandler

Wraps another WebSocketHandler instance and delegates to it.

Also provides a getDelegate() method to return the decorated handler as well as a getLastHandler() method to go through all nested delegates and return the "last" handler.

Since:

4.0

Author:

Rossen Stoyanchev

Constructor Summary

Constructors

Constructor	Description
WebSocketHandlerDecorator(WebSocketHandler delegate)

Method Summary

Modifier and Type	Method	Description
void	afterConnectionClosed(WebSocketSession session, CloseStatus closeStatus)	Invoked after the WebSocket connection has been closed by either side, or after a transport error has occurred.
void	afterConnectionEstablished(WebSocketSession session)	Invoked after WebSocket negotiation has succeeded and the WebSocket connection is opened and ready for use.
WebSocketHandler	getDelegate()
WebSocketHandler	getLastHandler()
void	handleMessage(WebSocketSession session, WebSocketMessage<?> message)	Invoked when a new WebSocket message arrives.
void	handleTransportError(WebSocketSession session, Throwable exception)	Handle an error from the underlying WebSocket message transport.
boolean	supportsPartialMessages()	Whether the WebSocketHandler handles partial messages.
String	toString()
static WebSocketHandler	unwrap(WebSocketHandler handler)

Methods inherited from class java.lang.Object

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

Constructor Details

WebSocketHandlerDecorator

public WebSocketHandlerDecorator(WebSocketHandler delegate)

Method Details

getDelegate

public WebSocketHandler getDelegate()

getLastHandler

public WebSocketHandler getLastHandler()

unwrap

public static WebSocketHandler unwrap(WebSocketHandler handler)

afterConnectionEstablished

public void afterConnectionEstablished(WebSocketSession session)
                                throws Exception

Description copied from interface: WebSocketHandler

Invoked after WebSocket negotiation has succeeded and the WebSocket connection is opened and ready for use.

Specified by:

afterConnectionEstablished in interface WebSocketHandler

Throws:

Exception - this method can handle or propagate exceptions; see class-level Javadoc for details.

handleMessage

public void handleMessage(WebSocketSession session,
 WebSocketMessage<?> message)
                   throws Exception

Description copied from interface: WebSocketHandler

Invoked when a new WebSocket message arrives.

Specified by:

handleMessage in interface WebSocketHandler

Throws:

Exception - this method can handle or propagate exceptions; see class-level Javadoc for details.

handleTransportError

public void handleTransportError(WebSocketSession session,
 Throwable exception)
                          throws Exception

Description copied from interface: WebSocketHandler

Handle an error from the underlying WebSocket message transport.

Specified by:

handleTransportError in interface WebSocketHandler

Throws:

Exception - this method can handle or propagate exceptions; see class-level Javadoc for details.

afterConnectionClosed

public void afterConnectionClosed(WebSocketSession session,
 CloseStatus closeStatus)
                           throws Exception

Description copied from interface: WebSocketHandler

Invoked after the WebSocket connection has been closed by either side, or after a transport error has occurred. Although the session may technically still be open, depending on the underlying implementation, sending messages at this point is discouraged and most likely will not succeed.

Specified by:

afterConnectionClosed in interface WebSocketHandler

Throws:

Exception - this method can handle or propagate exceptions; see class-level Javadoc for details.

supportsPartialMessages

public boolean supportsPartialMessages()

Description copied from interface: WebSocketHandler

Whether the WebSocketHandler handles partial messages. If this flag is set to true and the underlying WebSocket server supports partial messages, then a large WebSocket message, or one of an unknown size may be split and maybe received over multiple calls to WebSocketHandler.handleMessage(WebSocketSession, WebSocketMessage). The flag WebSocketMessage.isLast() indicates if the message is partial and whether it is the last part.

Specified by:

supportsPartialMessages in interface WebSocketHandler

toString

public String toString()

Overrides:

toString in class Object