Concurrent | Functional Concurrency Primitives | Architecture library
kandi X-RAY | Concurrent Summary
kandi X-RAY | Concurrent Summary
Concurrent is a collection of functional concurrency primitives inspired by [Concurrent ML] and [Concurrent Haskell] Traditional approaches to concurrency like locks, latches, and semaphores all fall under the same category of basic resource protection. While this affords them a large measure of simplicity, their use is entirely ad-hoc, and failing to properly lock or unlock critical sections can lead a program to beachball or worse. In addition, though we have become accustomed to performing work on background threads, communication between these threads is frought with peril. The primitives in this library instead focus on merging data with protection, choosing to abstract away the use of locks entirely. By approaching concurrency from the data side, rather than the code side, thread-safety, synchronization, and protection become inherent in types rather than in code.
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Top functions reviewed by kandi - BETA
Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of Concurrent
Concurrent Key Features
Concurrent Examples and Code Snippets
@Benchmark
public void randomReadAndWriteConcurrentHashMap() {
Map map = new ConcurrentHashMap<>();
performReadAndWriteTest(map);
}
@Benchmark
public void randomReadConcurrentHashMap() {
Map map = new ConcurrentHashMap<>();
performReadTest(map);
}
public Map listToConcurrentMap(List books) {
return books.stream().collect(Collectors.toMap(Book::getReleaseYear, Function.identity(), (o1, o2) -> o1, ConcurrentHashMap::new));
}
Community Discussions
Trending Discussions on Concurrent
QUESTION
I was following along with this tutorial on creating a concurrent counter struct for a usize
value: ConcurrentCounter
. As I understand it, this wrapper struct allows us to mutate our usize
value, with more concise syntax, for example:my_counter.increment(1)
vs. my_counter.lock().unwrap().increment(1)
.
Now in this tutorial our value is of type usize
, but what if we wanted to use a f32
, i32
, or u32
value instead?
I thought that I could do this with generic type arguments:
...ANSWER
Answered 2021-Jun-15 at 23:55I haven't come across such a ConcurrentCounter
library, but crates.io is huge, maybe you find something. However, if you are mostly concerned with primitives such as i32
, there is a better alternative call: Atomics, definitely worth checking out.
Nevertheless, your approach of generalizing the ConcurrentCounter
is going in a good direction. In the context of operation overloading, std::ops
is worth a look. Specifically, you need Add
, Sub
, and Mul
, respectively. Also, you need a Copy
bound (alternatively, a Clone
would also do). So you were pretty close:
QUESTION
First time actually using anything to do with swing - sorry for the poor code and crude visuals!
Using swing for a massively over-complicated password checker school project, and when I came to loading in a JMenuBar, it doesn't render properly the first time. Once I run through one of the options first, it reloads correctly, but the first time it comes out like this:
First render attempt
But after I run one of the methods, either by clicking one of the buttons that I added to check if it was just the JFrame that was broken or using one of the broken menu options, it reloads correctly, but has a little grey bar above where the JMenuBar actually renders: Post-method render
The code for the visuals is as follows:
...ANSWER
Answered 2021-Jun-15 at 18:29You should separate creating your menu from your content. Please review the following example. I decoupled your menu, component, and event logic into meaningful phases.
QUESTION
I'm struggling to use the Micronaut HTTPClient for multiple calls to a third-party REST service without receiving a io.micronaut.http.client.exceptions.ReadTimeoutException
To remove the third-party dependency, the problem can be reproduced using a simple Micronaut app calling it's own service.
Example Controller:
...ANSWER
Answered 2021-Jun-15 at 09:51If this isn't going to throw an exception then I don't know what is going to.
This is caused by using blocking
code within Netty's event loop
.
The code over here is making a blocking request 20 times in a row which cause the machine to break. I don't know what data is coming from the client but I would never recommend to do it in this manner.
QUESTION
I am trying to learn how python handles multiprocessing and have followed a youtube tutorial for some basic code but I am now trying to implement a ProcessPoolExecuter myself.
I have the following code which is causing the problem:
...ANSWER
Answered 2021-Jun-15 at 13:46The actual value being passed as the second argument games to getRecentWinners
is listOfGames
, which as a values of [1, 2, 3 ... 21]
. But the first line of getRecentWinners
is:
QUESTION
I am trying to run a test case which basically copies a file from my machine to a mock server running in docker. The same test works fine on Mac and Ubuntu. But on Windows it's getting failed with the following error:-
...ANSWER
Answered 2021-Mar-31 at 11:29The remote path must be /
, not \
.
And the argument to createCopyCommand
cannot be Path
, as on Windows, that will translate the /
to \
.
QUESTION
I need to push messages to external rabbitmq. My java configuration successfully declares queue to push, but every time I try to push, I have next exception:
...ANSWER
Answered 2021-Jun-15 at 07:19I'm struggling to understand how that code fits together, but this part strikes me as definitely wrong:
QUESTION
I am trying to contribute to a Github Page/Jekyll site and want to be able to visualise changes locally but when I run bundle exec jekyll serve
but I get this output:
ANSWER
Answered 2021-Feb-02 at 16:29I had the same problem and I found a workaround here at https://github.com/jekyll/jekyll/issues/8523
Add gem "webrick"
to the Gemfile in your website. Than run bundle install
At this point you can run bundle exec jekyll serve
For me it works!
QUESTION
We are using stream ingestion from Event Hubs to Azure Data Explorer. The Documentation states the following:
The streaming ingestion operation completes in under 10 seconds, and your data is immediately available for query after completion.
I am also aware of the limitations such as
Streaming ingestion performance and capacity scales with increased VM and cluster sizes. The number of concurrent ingestion requests is limited to six per core. For example, for 16 core SKUs, such as D14 and L16, the maximal supported load is 96 concurrent ingestion requests. For two core SKUs, such as D11, the maximal supported load is 12 concurrent ingestion requests.
But we are currently experiencing ingestion latency of 5 minutes (as shown on the Azure Metrics) and see that data is actually available for quering 10 minutes after ingestion.
Our Dev Environment is the cheapest SKU Dev(No SLA)_Standard_D11_v2 but given that we only ingest ~5000 Events per day (per metric "Events Received") in this environment this latency is very high and not usable in the streaming scenario where we need to have the data available < 1 minute for queries.
Is this the latency we have to expect from the Dev Environment or are the any tweaks we can apply in order to achieve lower latency also in those environments? How will latency behave with a production environment loke Standard_D12_v2? Do we have to expect those high numbers there as well or is there a fundamental difference in behavior between Dev/test and Production Environments in this concern?
...ANSWER
Answered 2021-Jun-15 at 08:34Did you follow the two steps needed to enable the streaming ingestion for the specific table, i.e. enabling streaming ingestion on the cluster and on the table?
In general, this is not expected, the Dev/Test cluster should exhibit the same behavior as the production cluster with the expected limitations around the size and scale of the operations, if you test it with a few events and see the same latency it means that something is wrong.
If you did follow these steps, and it still does not work please open a support ticket.
QUESTION
I followed the instructions at Structured Streaming + Kafka and built a program that receives data streams sent from kafka as input, when I receive the data stream I want to pass it to SparkSession variable to do some query work with Spark SQL, so I extend the ForeachWriter class again as follows:
...ANSWER
Answered 2021-Jun-15 at 04:42do some query work with Spark SQL
You wouldn't use a ForEachWriter for that
QUESTION
I have a question around how best to manage concurrent job instances in AWS glue.
I have a job defined like so:
...ANSWER
Answered 2021-Jun-14 at 20:29The "Max concurrent job runs per account" limit is a soft limit (https://docs.aws.amazon.com/general/latest/gr/glue.html). Maybe log a service request with AWS and ask for an increase in the limit. The second thing is I am not sure how you have implemented your sleep action in the code, maybe instead of doing just a sleep catch the exception each time you make the call, if there is an exception, sleep with an exponential backoff in seconds and try again when sleep time is finished and repeat until your get a positive response OR when you reach your own set limit to stop. This way your processing will not stop until you give up, but just slow down when throtteling kicks in.
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