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Trending Discussions on monos
QUESTION
Let's say I have a long chain of Monos. Some monos in the chain might return Mono.empty()
.
I can recover with switchIfEmpty
, but I'd like to know which mono raised the empty (maybe so I can know where to add smarter empty handling).
Is there a way to programmatically get this information?
Silly example. In cases where I return how did I get here?
, how I can know if the first flatMap
or the second flatMap
triggered the empty handler?
ANSWER
Answered 2021-May-26 at 08:48Due to the dynamic nature of Flux
and Mono
, and to the fact that the onComplete
signal is considered neutral enough that it is usually just passed through, there is no generic solution for this.
In your particular example, you could replace the Mono.empty()
with something like Mono.empty().doOnComplete(() -> /* log something */)
.
You could even directly perform the logging in the if block, but the decorated empty trick is probably adaptable to more situations.
Another possibility is to turn emptiness into an error, rather than a switch on onComplete signal.
Errors are less neutral, so there are ways to enrich them for debugging purposes. For instance, with a .checkpoint("flatMapX")
statement after each flatMap, you'd get additional stacktrace parts that would point to the flatMap which failed due to emptyness.
A way of turning emptiness to error in Mono
is .single()
, which will enforce exactly one onNext()
or propagate onError(NoSuchElementException)
.
One thing to keep in mind with this trick is that the placement of checkpoint
matters: it MUST be AFTER the single()
so that the error raised from the single() gets detected and enriched.
So if I build on your snippet:
QUESTION
I'm trying to solve project problems after upgrading from Spring Boot 2.3.1.RELEASE to Spring Boot 2.5.0 (doesn't work either for 2.4.0+) with @TypeAlias seem to be ignored.
I use Kotlin and reactive manner to achieve this. I got set basePackages to com.example.ajax for @EntityScan, @SpringBootApplication and @EnableReactiveMongoRepositories.
Here is example what I'm trying to achieve and it worked back in 2.3.1 (don't mind the structure):
...ANSWER
Answered 2021-May-24 at 10:59Looks like annotation @Document fixes it.
QUESTION
When I read one of these MDN pages, I see that there’s something like the SVG below where the object interface points to another one which it inherits from:
...ANSWER
Answered 2021-May-20 at 14:57You can make this tree yourself by using a few JavaScript methods.
In this approach, I’m going to use Map
a lot, because it allows us to easily map arbitrary values to each other (i.e. keys are not just strings and symbols like in objects), along with Set
.
The prototype
property of a constructor is always mapped to the prototype of the super-class when using Object.getPrototypeOf
.
Look at these relationships:
QUESTION
I am trying to use PostCSS nesting with CSS variables but it doesn't convert CSS variables at all.
Instead it shows Invalid property value
in the DOM for CSS Variables.
My tailwind.css
file contains a bunch of CSS variables:
ANSWER
Answered 2021-May-20 at 06:10The complete solution was to remove quotes & object notation in CSS. I copied the whole thing from CSS-in-JS but forgot to remove quotes & object notation aka :
QUESTION
I am looking to return a Mono.just(file.getAbsolutePath()) after I have saved the file. The following is my code:
...ANSWER
Answered 2021-May-13 at 14:21I think it can be done like this:
QUESTION
I have a bootstrap container for my page content, but no container for my header. My header is very simple and bootstrapping it seems overkill. The issue i'm running into is my non bootstrap sticky header is sticky only up until the page hits the bootstrap content. Then the sticky header stops in its tracks. DO you know where i'm going wrong?
HTML
(the 500px div is there for me to test the sticky header. The header is sticky for all 500px, until the page gets to the bootstrap container. Then the sticky header stops in its tracks.)
...ANSWER
Answered 2021-May-04 at 23:46The sticky element will only stick to its parent.
Try adding your sticky css to header
:
QUESTION
My footer is not sticking on the bottom of my page. It only goes until the bottom of my screen, but when I scroll down, the footer is stuck on the location where my bottom of screen was. It sticks on the bottom of my screen but not on the bottom of my entire page. Someone please help I almost tried everything. The body and html doesn't take up the size of my whole page too, only the size of my screen which is 1920 x 1080. I tried every sizes like 100vh, 100%, min-width, set the footer div to absolute with bottom: 0, and none of them works :( (I'm also a newbie)
One time I managed to make the body fill the whole page but the footer is still stuck in the position.
MY HTML CODE: (Footer div located at bottom)
...ANSWER
Answered 2021-Apr-29 at 13:01Most simple way to achive it is to make the body 100% of your page, with a min-height of 100% too. This works fine if the height of your footer does not change.
Give the footer-container a negative margin-top:
QUESTION
ANSWER
Answered 2021-Apr-29 at 04:38According to the VS Code documentation, you can customize your theme color by using the editor.tokenColorCustomizations
rule in your user settings:
Open your
settings.json
and add the following rule first (replaceYOUR THEME NAME HERE
with the name of your color theme):
QUESTION
I noticed that when the letter f
acts strangely when it's in the code
tag and followed by either its self or some other - but not all - characters.
For example:
...ANSWER
Answered 2021-Apr-28 at 14:18For some unknown reason, my browser was using a weird font called "Nimbus Mono Regular" for monospaced text. Which was the source of my misery. Thanks to the commenters for the help.
QUESTION
I am trying to extract a prores video with just 2.0 (with L R on same track) from a Prores with the below audio track layout. How can I do that using the FFmpeg library?
I could not figure out which command to use from the below ffmpeg library spec https://trac.ffmpeg.org/wiki/AudioChannelManipulation#a2monostereo
Desired Output PRORES to contain below track layout
track 0 - video (src Stream #0:0) track 1 - L R (src Stream #0:1)
Below is the source video/audio Track Layout
...ANSWER
Answered 2021-Apr-24 at 07:29If you wish to extract the first two audio tracks as a single stereo track, use
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On a UNIX-like operating system, using your system’s package manager is easiest. However, the packaged Ruby version may not be the newest one. There is also an installer for Windows. Managers help you to switch between multiple Ruby versions on your system. Installers can be used to install a specific or multiple Ruby versions. Please refer ruby-lang.org for more information.
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