new InvocationBuilderListener SPI

[jansupol]

Signed-off-by: Jan Supol [email protected]

[jansupol]

This new SPI interface allows for

• creating decorators that modify the requests (Invocation.Builder) as needed.
• setting the ClientRequestContext properties (in the main thread rather than in the executor service thread when invoked by RxInvoker and set by Filter), possibly registered automatically using AutoDiscoverable interface
• providing functionality already requested by the MP RestClientBuilderListener

[jansupol]

@pdudits Would this help you with #4267?

[jansupol]

@pdudits The InvocationBuilderListener is to be called when the InvocationBuilder is created, the same as the RestClientBuilderListener. Is it good enough for you to have it called at the time, i.e. long time before the rx() is called?

[pdudits]

I'll have a detailed look tomorrow, at first sight it looks good. One usually uses RestClientBuilder to build client for many invocations (in real applications, contrary to tests), so I think the relation of lifecycles are but different

[pdudits]

I tested this API with the same four usecases as in #4301, code is in this branch.

All of these usecases are satisfied by this, so I'm quite happy.

[tomas-langer]

LGTM
maybe consider possibility to get and modify URL to be called and access to configuration

[jansupol]

@tomas-langer I have added getters to the headers, configuration, and URI.