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fromCallable doesn't shield you from blocking computation inside the Callable, which your example demonstrates.

The primary mean of cancellation in Reactive Streams is the cancel() signal propagated from downstream via the Subscription.

Even with that, the fundamental requirement of avoiding blocking code inside reactive code still holds, because if the operators are simple enough (ie. synchronous), a blocking step could even prevent the propagation of the cancel() signal...

A way to adapt non-reactive code while still getting notified about cancellation is Mono.create: it exposes a MonoSink (via a Consumer) which can be used to push elements to downstream, and at the same time it has a onCancel handler.

You would need to rewrite your code to eg. check an AtomicBoolean on each iteration of the loop, and have that AtomicBoolean flipped in the sink's onCancel handler:

Here's an example WebFilter that will reroute all calls from /some/health to /actuator/health

I have one big question here. While this is correct (it yields the same response) is this the correct thing to do?

Essentially, yes, you've done it correctly. The only things that aren't really correct there are your Webclient usage, and your style.

You certainly don't have to specify a WebClient per URI (and you shouldn't, they're meant to be reusable.) So if you have different domains and the same webclient, just create a standard instance:

I managed to fix it by prepending the variable like so:

Use org.springframework.core.io.buffer.DataBufferUtils to join the DataBuffers from the Flux into a single DataBuffer, and then read that buffer into a byte array.

If you have the option to change the return type of controller's method saveOrUpdateUser to Mono, you can use mono's flatMap method tô return the redirect String like:

This problem can be solved with the method exchangeToMono. This results into the following snippet.

Your code is correct. And TreeTable does show all columns, you just miss the horizontal scroll at bottom of the grid.

To fix the situation, you need to

• init UI in container ( currently it is atached to the body ). To do so you need to add container property to the UI configuration

What you're attempting to do is a reduction of your dataset. It means that you attempt to create a single result by merging your initial elements.

Note that count can be considered as a kind of reduction, and in your case, you want an advanced kind of count operation, that also check if at least one of the input elements is equal to a given value.

With reactor (and many other stream framework), you can use the reduce operator.

Let's try your first example with it :