[undertow-dev] Undertow 3 API Migration

[Darran Lofthouse]

I have been looking at the steps required to migrate the WildFly Elytron
integration to Undertow 3 from Undertow 2.

Overall it seems minimal changes are required but I was thinking if there
could be an opportunity to evolve the API within Undertow 2 making
migration to 3 easier in the future.

One example being on SSSessionInfo we make use of the following method: -

void renegotiate(HttpServerExchange exchange, SslClientAuthMode
sslClientAuthMode) throws IOException;

which has now been changed to: -

void renegotiate(HttpServerExchange exchange, ClientAuth sslClientAuthMode)
throws IOException;

The first form is making use of Xnio API and the second is using Netty API.

If this was deprecated in Undertow 2 and a pure Undertow variant added it
could be usable both in 2 and 3.

I suspect a number of the other changes breaking API compatibility could be
handled in a similar way.

Regards,
Darran Lofthouse.
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