spin | Scala Vaadin UI enhacements | User Interface library

 by   eugener Scala Version: Current License: No License

kandi X-RAY | spin Summary

kandi X-RAY | spin Summary

spin is a Scala library typically used in User Interface applications. spin has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

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            kandi-support Support

              spin has a low active ecosystem.
              It has 2 star(s) with 1 fork(s). There are 1 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              There are 3 open issues and 1 have been closed. On average issues are closed in 5 days. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of spin is current.

            kandi-Quality Quality

              spin has 0 bugs and 0 code smells.

            kandi-Security Security

              spin has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              spin code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              spin does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              OutlinedDot
              Without a license, all rights are reserved, and you cannot use the library in your applications.

            kandi-Reuse Reuse

              spin releases are not available. You will need to build from source code and install.
              It has 407 lines of code, 49 functions and 7 files.
              It has medium code complexity. Code complexity directly impacts maintainability of the code.

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            spin Key Features

            No Key Features are available at this moment for spin.

            spin Examples and Code Snippets

            No Code Snippets are available at this moment for spin.

            Community Discussions

            QUESTION

            Adding the values of a field using FOR loop
            Asked 2022-Feb-03 at 17:17

            How do I add the values in a field based on the same values in another field using FOR loop?

            ...

            ANSWER

            Answered 2022-Jan-22 at 13:23

            Below is minimal reproducible example, which uses ABAP Unit (Ctrl+Shift+F10 to run it). I commented your code and replaced it with the solution:

            Source https://stackoverflow.com/questions/70798542

            QUESTION

            Why does this spinlock require memory_order_acquire_release instead of just acquire?
            Asked 2022-Feb-02 at 10:16
            // spinlockAcquireRelease.cpp
            
            #include 
            #include 
            
            class Spinlock{
              std::atomic_flag flag;
            public:
              Spinlock(): flag(ATOMIC_FLAG_INIT) {}
            
              void lock(){
                while(flag.test_and_set(std::memory_order_acquire) ); // line 12
              }
            
              void unlock(){
                flag.clear(std::memory_order_release);
              }
            };
            
            Spinlock spin;
            
            void workOnResource(){
              spin.lock();
              // shared resource
              spin.unlock();
            }
            
            
            int main(){
            
              std::thread t(workOnResource);
              std::thread t2(workOnResource);
            
              t.join();
              t2.join();
            
            }
            
            ...

            ANSWER

            Answered 2022-Jan-12 at 22:30

            std::memory_order_acq_rel is not required.

            Mutex synchronization is between 2 threads.. one releasing the data and another acquiring it.
            As such, it is irrelevant for other threads to perform a release or acquire operation.

            Perhaps it is more intuitive (and efficient) if the acquire is handled by a standalone fence:

            Source https://stackoverflow.com/questions/70676313

            QUESTION

            Why second spin in Spinlock gives performance boost?
            Asked 2022-Jan-28 at 15:23

            Here is a basic Spinlock implemented with std::atomic_flag.
            The author of the book claims that second while in the lock() boosts performance.

            ...

            ANSWER

            Answered 2022-Jan-28 at 05:13

            Reading a memory address does not clear the cache line.

            Writing does.

            So in a modern computer, there is RAM, and there are multiple layers of cache "around" the CPU (they are called L1, L2 and L3 cache, but the important part is that they are layers, and the CPU is at the middle). In a multi-core system, often the outer layers are shared; the innermost layer is usually not, and is specific to a given CPU.

            Clearing the cache line means informing every other cache holding this memory "the data you own may be stale, throw it out".

            Test and set writes true and atomically returns the old value. It clears the cache line, because it writes.

            Test does not write. If you have another thread unsynchronized with this one, it reading the cache of this memory doesn't have to be poked.

            The outer loop writes true, and exits if it replaced false. The inner loop waits until there is a false visible, then falls to outer loop. The inner loop need not clear every other cpu's cache status of the value of the atomic flag, but the outer has to (as it could change the false to true). As spinning could go on for a while, avoiding continuous cache clearing seems like a good idea.

            Source https://stackoverflow.com/questions/70887350

            QUESTION

            Why does hint::spin_loop use ISB on aarch64?
            Asked 2022-Jan-23 at 14:13

            In std::hint there's a spin_loop function with the following definition in its documentation:

            Emits a machine instruction to signal the processor that it is running in a busy-wait spin-loop (“spin lock”).

            Upon receiving the spin-loop signal the processor can optimize its behavior by, for example, saving power or switching hyper-threads.

            Depending on the target architecture, this compiles to either:

            That last one has got my head spinning a little bit (😉). I thought that ISB is a lengthy operation, which would mean that, if used within a spin lock, the thread lags a bit in trying to detect whether the lock is open again, but otherwise there's hardly any profit to it.

            What are the advantages of using ISB SY instead of a NOP in a spin loop on aarch64?

            ...

            ANSWER

            Answered 2022-Jan-23 at 14:13

            I had to dig into the Rust repository history to get to this answer:

            The yield has been replaced with isb in c064b6560b7c:

            On arm64 we have seen on several databases that ISB (instruction synchronization barrier) is better to use than yield in a spin loop. The yield instruction is a nop. The isb instruction puts the processor to sleep for some short time. isb is a good equivalent to the pause instruction on x86.

            [...]

            So essentially, it uses the time it takes for an ISB to complete to pause the processor, so that it wastes less power.

            Peter Cordes explained it nicely in one of his comments:

            ISB SY doesn't stall for long, just saves a bit of power vs. spamming loads in a tight loop.

            Source https://stackoverflow.com/questions/70810121

            QUESTION

            Get N number of rows from mysql and update values in columns at the same time
            Asked 2021-Dec-28 at 11:05

            I need to process thousands of files stored in an S3 bucket. My idea was to spin up a bunch of EC2 VMS (96 cores each) and have them contact a MySQL database via python to get 96 S3 paths to the files it needs to process. I also want to log if it is in progress or has been processed with an IN_PROGRESS AND PROCESSED column set to 0 or 1. I have the current statement, the problem I am running into is that it updates the IN_PROGRESS value, but I am not sure how to select/return the 96 filenames needed to process. I cannot run SELECT * FROM temp, after running the update it returns an error.

            ...

            ANSWER

            Answered 2021-Dec-28 at 11:05

            Your question isn't super clear about where you get these instances, so I'm guessing a bit.

            Try some SQL like this to avoid race conditions. Be sure to use MySQL's InnoDB storage engine; MyISAM and AriaDB don't support transactions.

            Source https://stackoverflow.com/questions/70499335

            QUESTION

            AWS Appsync GraphQL query silently failing though successful 200 response
            Asked 2021-Dec-23 at 21:09

            I have one React Amplify app running with two environments. One environment is for my wife's blog (www.riahraineart.com) and one for my blog (www.joshmk.com). Both sites are running off the same repo, I'm just configuring the site's differently based on an environment variable I use to retrieve their configurations from a table.

            ...

            ANSWER

            Answered 2021-Dec-23 at 21:09

            I fixed it! Unfortunately, the solution was pretty specific to my situation so it may not provide too much value for others. Although, I hope it helps with troubleshooting.

            After locally switching my backend configuration over to her site using amplify pull --appId --envName I noticed that the configuration call was now successful. I had forgotten that I had never actually run her site locally, I only hopped to her branch to merge and push.

            The site was still not rendering though, which perked my ears for a race condition. I discovered that I had left a checker for some images that was gating render of my topmost component. My wife has a ton of images, so I think this call was taking too long to make the chain of events load items in the correct order, and the page showed blank. Simply removing that check for those images at that point, showed the UI.

            Source https://stackoverflow.com/questions/70388832

            QUESTION

            Is it possible to run a javascript proxy that proxy the video's media request on the client side?
            Asked 2021-Dec-20 at 01:07

            I have video files hosted on the CDN, the video file is encrypted. So I need the decrypt it before play it in the browser. But the web video tag has no interface to modify the media stream.

            So I want to run a proxy in the client side with javascript to proxy the media stream request, and decrypt the stream before feet to the video tag.

            Is it possible?

            By math-chen's answer, I have tryed below code, but when I paly it, the video keep spin and not render the frame like below image.

            I use a very small unencrypted video file out.mp4, so it can be loaded by once.

            ...

            ANSWER

            Answered 2021-Dec-17 at 09:29

            it does not need a proxy

            Source https://stackoverflow.com/questions/70390112

            QUESTION

            Prisma deleteMany with a list of IDs
            Asked 2021-Nov-30 at 22:24

            I'm wondering if there is a way in the Prisma Client to batch delete database records by id.

            Something like this doesn't seem to exist:

            ...

            ANSWER

            Answered 2021-Nov-30 at 22:24

            Did you try using the in operator?

            Source https://stackoverflow.com/questions/70175448

            QUESTION

            How to make circle area transparent/see-through?
            Asked 2021-Nov-30 at 02:35

            To be able to see through to the other side what I want to do is make the circle area transparent so you are able to see through to the background image.

            How would this be done?

            Is there a way to do that?

            https://jsfiddle.net/r95sy2fw/

            This image is what I am trying to replicate in the code.

            How do I make it transparent like that?

            The snippet I provided currently looks like this:

            ...

            ANSWER

            Answered 2021-Nov-30 at 02:35

            You need add a transparent hole in .curtain class:

            Source https://stackoverflow.com/questions/69959694

            QUESTION

            ConcurrentHashMap.initTable(), why check table is null twice?
            Asked 2021-Nov-18 at 14:34

            I'm learning the java source code, when i reading the ConcurrentHashMap source code, i'm confused with the initTable() method, why check (tab = table) == null || tab.length == 0 twice, first in the while(), then in the if(). I can't imagine in what situation need the second check.

            I think maybe it's because the JVM reorder the code, put sizeCtl = sc; in front of Node[] nt = (Node[])new Node[n];. It's just my guess, I don't know is it right.

            Can some one explain it, thanks a lot.

            ...

            ANSWER

            Answered 2021-Nov-18 at 14:34

            Multiple threads may compete to do this (see "initialization race" comment).

            To paraphrase the code:

            Source https://stackoverflow.com/questions/70021289

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

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            You can download it from GitHub.

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            https://github.com/eugener/spin.git

          • CLI

            gh repo clone eugener/spin

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            git@github.com:eugener/spin.git

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