如何使用反应器在 doFinally 或 doOnCancel 中获取上下文？

Question

I'm trying to get a value that I have in the context, I canot figure out how can I do that, any idea?, example:

 return mono
        .doFinally(signalType -> how??? )
        .doOnEach(signal -> { 
               ... signal.getContext();
               ...
            }) -> is ok I got the context
        .subscriberContext(ctx -> ctx.put("key", "foo"));

Answer 1

Consider using Mono#deferWithContext :

return Mono
    .deferWithContext(ctx -> {
        mono.doFinally(signalType -> handleSignal(ctx, signalType))
            .doOnEach(...)
    })
    // later...
    .subscriberContext(ctx -> ctx.put("key", "foo"));