org.springframework.web.socket.server

Interface RequestUpgradeStrategy

All Known Implementing Classes:

AbstractStandardUpgradeStrategy, AbstractTyrusRequestUpgradeStrategy, GlassFishRequestUpgradeStrategy, JettyRequestUpgradeStrategy, TomcatRequestUpgradeStrategy, UndertowRequestUpgradeStrategy, UndertowRequestUpgradeStrategy.FallbackStrategy, WebLogicRequestUpgradeStrategy, WebSphereRequestUpgradeStrategy

public interface RequestUpgradeStrategy

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

Since:

4.0

Author:

Rossen Stoyanchev

Method Summary

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

Method Detail

getSupportedVersions

java.lang.String[] getSupportedVersions()

Return the supported WebSocket protocol versions.

getSupportedExtensions

java.util.List<WebSocketExtension> getSupportedExtensions(ServerHttpRequest request)

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

upgrade

void upgrade(ServerHttpRequest request,
             ServerHttpResponse response,
             java.lang.String selectedProtocol,
             java.util.List<WebSocketExtension> selectedExtensions,
             java.security.Principal user,
             WebSocketHandler wsHandler,
             java.util.Map<java.lang.String,java.lang.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.