When an annotated handler returns a Message from a @SubscribeEvent
or @MessageMapping method and it contains no destination in its
headers, use the received message's destination as the response
message's destination.
Without generics, extending AbstractPubSubChannelRegistry and using
a custom Message type requires some unpleasant casting and suppression
of warnings. By genericizing PubSubChannelRegistry and
AbstractPubSubChannelRegistry these problems can be avoided.
To improve compatibility between Spring's messaging classes and
Spring Integration, the type of Message that is created has been made
pluggable through the introduction of a factory abstraction;
MessageFactory.
By default a MessageFactory is provided that will create
org.springframework.messaging.GenericMessage instances, however this
can be replaced with an alternative implementation. For example,
Spring Integration can provide an implementation that creates
org.springframework.integration.message.GenericMessage instances.
This control over the type of Message that's created allows messages
to flow from Spring messaging code into Spring Integration code without
any need for conversion. In further support of this goal,
MessageChannel, MessageHandler, and SubscribableChannel have been
genericized to make the Message type that they deal with more
flexible.
org.springframework.web.stomp is now
org.springframework.web.messaging.stomp
Also classes in the ~.stomp.server and ~.stomp.adapter packages have
been renamed.
Allow WebSocketHandler methods to raise an exception.
By default we install ExceptionWebSocketHandlerDecorator, which logs
unhandled exceptions and closes the session. That decorator can be
extended or replaced.
Any exceptions that remain unhandled still (i.e. no exception handling
decorator), are caught in the lowest level before propagating to the
WebSocket engine or a SockJS transport handler and handled the same
way. That means default behavior is guaranteed but also fully
customizable.
WebSocketHandler implementations:
- methods must deal with exceptions locally
- uncaught runtime exceptions are handled by ending the session
- transport errors (websocket engine) are passed into handleError
WebSocketSession methods may raise IOException
SockJS implementation of WebSocketHandler:
- delegate SockJS transport errors into handleError
- stop runtime exceptions from user WebSocketHandler and end session
SockJsServce and TransportHandlers:
- raise IOException or TransportErrorException
HandshakeHandler:
- raise IOException
HandlerProvider is now an interface that can be used to plug in
WebSocket handlers with per-connection scope semantics. There are two
implementations, of the interface, one simple and a second that creates
handler instances through AutowireCapableBeanFactory.
HandlerProvider also provides a destroy method that is used to
apply a destroy callback whenever a client connection closes.
There is now a WebSocketMessage type with TextMessage and BinaryMessage
sub-types. WebSocketHandler is also sub-divided into TextMessageHandler
and BinaryMessageHandler, so that applications can choose to handle
text, binary, or both.
Also in this commit, the SockJsHandler and SockJsSession interfaces
have been removed. SockJsService now accepts WebSocketHandler.
As opposed to close(), which actively closes the session, the
onClosed method is called when the underlying connection has been
closed or disconnected.
Add HandlerProvider<T> class
Modify HandshakeHandler to accept + adapt WebSocketHandler at runtime
Modify SockJsService to accept + adapt SockJsHandler at runtime
This is useful to make sure response headers are written to the
underlying response. It is also useful in conjunction with long
running, async requests and HTTP streaming, to ensure the Servlet
response buffer is sent to the client without additional delay and
also causes an IOException to be raised if the client has gone away.
- configure SockJS handler by type (as well as by instance)
- add method to obtain SockJS handler instance via SockJsConfiguration
- detect presense of jsr-356 and use it if available
Andy Wilkinson
Rossen Stoyanchev
Rossen Stoyanchev
Rob Winch
Juergen Hoeller
Phillip Webb