org.springframework.web.socket.messaging

Interface SubProtocolErrorHandler<P>

All Known Implementing Classes:

StompSubProtocolErrorHandler

public interface SubProtocolErrorHandler<P>

A contract for handling sub-protocol errors sent to clients.

Since:

4.2

Author:

Rossen Stoyanchev

Method Summary

Modifier and Type	Method and Description
Message<P>	handleClientMessageProcessingError(Message<P> clientMessage, java.lang.Throwable ex) Handle errors thrown while processing client messages providing an opportunity to prepare the error message or to prevent one from being sent.
Message<P>	handleErrorMessageToClient(Message<P> errorMessage) Handle errors sent from the server side to clients, e.g.

Method Detail

handleClientMessageProcessingError

@Nullable
Message<P> handleClientMessageProcessingError(@Nullable
                                                        Message<P> clientMessage,
                                                        java.lang.Throwable ex)

Handle errors thrown while processing client messages providing an opportunity to prepare the error message or to prevent one from being sent.

Note that the STOMP protocol requires a server to close the connection after sending an ERROR frame. To prevent an ERROR frame from being sent, a handler could return null and send a notification message through the broker instead, e.g. via a user destination.

Parameters:

clientMessage - the client message related to the error, possibly null if error occurred while parsing a WebSocket message

ex - the cause for the error, never null

Returns:

the error message to send to the client, or null in which case no message will be sent.

handleErrorMessageToClient

@Nullable
Message<P> handleErrorMessageToClient(Message<P> errorMessage)

Handle errors sent from the server side to clients, e.g. errors from the "broke relay" because connectivity failed or the external broker sent an error message, etc.

Parameters:

errorMessage - the error message, never null

Returns:

the error message to send to the client, or null in which case no message will be sent.