Interface RequestUpgradeStrategy

All Known Implementing Classes:

JettyRequestUpgradeStrategy, StandardWebSocketUpgradeStrategy

public interface RequestUpgradeStrategy

A server-specific strategy for performing the actual upgrade to a WebSocket exchange.

Since:

4.0

Author:

Rossen Stoyanchev

See Also:

• StandardWebSocketUpgradeStrategy

Method Summary

Modifier and Type	Method	Description
List<WebSocketExtension>	getSupportedExtensions(ServerHttpRequest request)	Return the WebSocket protocol extensions supported by the underlying WebSocket server.
String[]	getSupportedVersions()	Return the supported WebSocket protocol versions.
void	upgrade(ServerHttpRequest request, ServerHttpResponse response, @Nullable String selectedProtocol, List<WebSocketExtension> selectedExtensions, @Nullable Principal user, WebSocketHandler wsHandler, Map<String,Object> attributes)	Perform runtime specific steps to complete the upgrade.

Method Details

getSupportedVersions

String[] getSupportedVersions()

Return the supported WebSocket protocol versions.

getSupportedExtensions

List<WebSocketExtension> getSupportedExtensions(ServerHttpRequest request)

Return the WebSocket protocol extensions supported by the underlying WebSocket server.

upgrade

void upgrade(ServerHttpRequest request,
 ServerHttpResponse response,
 @Nullable String selectedProtocol,
 List<WebSocketExtension> selectedExtensions,
 @Nullable Principal user,
 WebSocketHandler wsHandler,
 Map<String,Object> attributes)
      throws HandshakeFailureException

Perform runtime specific steps to complete the upgrade. Invoked after successful negotiation of the handshake request.

Parameters:

request - the current request

response - the current response

selectedProtocol - the selected sub-protocol, if any

selectedExtensions - the selected WebSocket protocol extensions

user - the user to associate with the WebSocket session

wsHandler - the handler for WebSocket messages

attributes - handshake request specific attributes to be set on the WebSocket session via HandshakeInterceptor and thus made available to the WebSocketHandler

Throws:

HandshakeFailureException - thrown when handshake processing failed to complete due to an internal, unrecoverable error, i.e. a server error as opposed to a failure to successfully negotiate the requirements of the handshake request.