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QUESTION
I am querying a database for an item using R2DBC and Spring Integration. I want to extend the transaction boundary a bit to include a handler - if the handler fails I want to roll back the database operation. But I'm having difficulty even establishing transactionality explicitly in my integration flow. The flow is defined as
...ANSWER
Answered 2021-Jun-15 at 18:32Well, it's indeed not possible that declarative way since we don't have hook for injecting to the reactive type in the middle on that level.
Try to look into a TransactionalOperator
and its usage from the Java DSL's fluxTransform()
:
QUESTION
SpringBoot v2.5.1
There is an endpoint requesting a long running process result and it is created somehow
(for simplicity it is Mono.fromCallable( ... long running ... )
.
Client make a request and triggers the publisher to do the work, but after several seconds client aborts the request (i.e. connection is lost). And the process still continues to utilize resources for computation of a result to throw away.
What is a mechanism of notifying Project Reactor's event loop about unnecessary work in progress that should be cancelled?
...ANSWER
Answered 2021-Jun-15 at 09:06fromCallable
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:
QUESTION
A server environment requires an endpoint for /some/health
.
I already configured actuator.
Rather changing the actuator's function, I'm thinking forwarding /some/health
to the /actuator/health
.
And I'm trying to do with HandlerFilterFunction
.
ANSWER
Answered 2021-Jun-15 at 08:50Here's an example WebFilter
that will reroute all calls from /some/health
to /actuator/health
QUESTION
Small question regarding Spring Webflux, and how to "chain" http calls please.
With a concrete example, here is a very straightforward sample with Spring MVC, with a rest template.
...ANSWER
Answered 2021-Jun-14 at 13:54I 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:
QUESTION
We use a Angular app along with the IBM Plex font.
According to the developers of the font, the following configuration must be set in order to correctly load all fonts, which worked fine for Angular 9.
...ANSWER
Answered 2021-Jun-14 at 06:15I managed to fix it by prepending the variable like so:
QUESTION
There is a Flux
. What is the natural way of converting it to Mono
?
ANSWER
Answered 2021-Jun-13 at 19:05Use 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.
QUESTION
in the controller, I save the object. the saveOrUpdateUser method returns mono. but the redirect is faster than the object is saved to the database. Since I do not get this object in another method where the redirect occurs.
...ANSWER
Answered 2021-Jun-13 at 14:34If 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:
QUESTION
My goal is to get the HttpStatus from a Spring WebClient request. All other information of the request is irrelevant.
My old way of doing this was:
...ANSWER
Answered 2021-Jun-11 at 21:54This problem can be solved with the method exchangeToMono
. This results into the following snippet.
QUESTION
Here's a codepen demonstrating a treetable with groups:
https://codepen.io/dharmatech/full/mdWGbox
ScreenshotScreenshot of the above treetable:
The IssueOnly some of the columns are shown; there are many more available. However, note that there is no horizontal scrollbar shown at the bottom to bring the other columns into view.
Is there a way to turn on a horizontal scrollbar?
Approaches I've exploredI've tried each of these:
...ANSWER
Answered 2021-Jun-11 at 09:04Your 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
QUESTION
I am trying to do following operations on Flux/Publisher which can only be read once ( think database results which can be read once). But, this question is generic enough that it can be answered in functional programming context without reactor knowledge.
- count unique item
- check if an element exists
- Don't call the publisher/flux generator multiple times.
ANSWER
Answered 2021-Jun-09 at 11:57What 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 :
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