async.h | Stackless Async Subroutines for C | Reactive Programming library
kandi X-RAY | async.h Summary
kandi X-RAY | async.h Summary
Taking inspiration from protothreads and async/await as found in C#, Rust and JS, this is a header-only async/await implementation for C based on Duff's device.
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QUESTION
New to flutter and async programming in general. I want to use this function:
https://pub.dev/documentation/ffmpeg_kit_flutter/latest/ffmpeg_kit/FFmpegKit/executeAsync.html
I don't understand the part that says
You must use an FFmpegSessionCompleteCallback if you want to be notified about the result.
Can someone explain how to use this as if I was a beginner programmer? Is this parameter something I can use to print a simple message to the console, like 'execution finished'?
What I've tried so far:
...ANSWER
Answered 2022-Feb-26 at 21:33The callback will be invoked when the operation completes. However, when you do
QUESTION
Use the answer in the question: simultaneous read and write to child's stdio using boost.process,
I refactored the code and hybridized the new method using the Boost library. I've been successful in making a pipes connection with Stockfish, but this is also where I get errors I've never seen before, not even Google helps.
Here is what I have tried:
...ANSWER
Answered 2022-Jan-15 at 03:04You are printing to cout
as if the async operations happen immediately. That's not the case. The async operations only happen when the io service runs.
QUESTION
I have three tasks in an ansible playbook that are unique enough that I can't wrap them in a loop. For simplicity, let's assume they are creating three different VM instances in a cloud provider and that each task has a specific configuration
...ANSWER
Answered 2022-Jan-10 at 12:42Q: "They seem to use loops which I can't do here because the different sets are pretty different. How/Can I async these tasks?"
A: You can use a loop to wait for the tasks. For example
QUESTION
Is there a way to import dynamically a component with a Loader default if it's not loaded ?
We use something like this right now,
...ANSWER
Answered 2021-Jun-10 at 22:51Your code should already work. It might seem to not work because the loading happens instantaneously.
If you artificially delay the return of import('../components/dashboard')
, you'll notice the loader displayed:
QUESTION
I'm very new to F# and I've been reading F# for Fun and Profit. In the Why use F#? series, there's a post describing async code. I ran across the Async.StartChild
function and I don't understand why the return value is what it is.
The example:
...ANSWER
Answered 2021-May-29 at 05:37The idea is this: You start another async-computation (in the background) with let wait = Async.StartChild otherComp
and you get the waiter back.
What that means is that let! result = waiter
will block and wait for the result of your background-computation whenever you want.
if Async.StartChild
would return a Async<'t>
you would wait with let! x = otherComp
right there and it would be just like a normal let! result = otherComp`
And yes F# Async-Workflows will only start once you do something like Async.Start...
or Async.RunSynchronously
(it's not like a Task
that usually runs as soon as you created it)
that's why in C# you can create a Task (var task = CreateMyTask()
) at one point (that would be the Async.StartChild
part) and then later use var result = await task
to wait there for the result (that's the let! result = waiter
part).
Async.StartChild
returns Async<'T>>
instead of Async<'T>
This is because the workflows started this way is supposed to behave like a child-task/process. When you cancel the containing workflow the child should be canceled as well.
So on a technical level the child-workflow needs access to the cancelation-token without you passing it explicitly and that is one thing the Async
-Type handles in the background for you when you use Bind
(aka let!
here).
So it has to be this type in order for that passing of the cancelation-token to work.
QUESTION
I have a fastAPI app that posts two requests, one of them is longer (if it helps, they're Elasticsearch queries and I'm using the AsyncElasticsearch module which already returns coroutine). This is my attempt:
...ANSWER
Answered 2021-Apr-02 at 09:30Yes, that's correct the coroutine won't proceed until the results are ready. You can use asyncio.gather to run tasks concurrently:
QUESTION
I have a small number of actors (written in Java, using Akka typed APIs), which make use of TimerScheduler
to schedule messages to themselves. I'd like to write tests that check their interactions.
When using the ActorTestKit
recommended in the documentation, it can execute them using normal timers, which means that when the actor schedules a message to itself in 10 seconds, then the test has to last 10 seconds.
In order to speed up tests, I'd like to use virtual time for the test, where the scheduler in the test does not actually wait but advances a virtual clock instead. Unfortunately, ActorTestKit
does not seem to support this concept.
Is there any established pattern for running such tests?
...ANSWER
Answered 2021-May-03 at 01:24The ActorTestKit
includes ManualTime
(in the Java API: akka.actor.testkit.typed.javadsl.ManualTime
) which lets you advance the timer by durations (e.g. between assertions). See controlling the Scheduler in the ActorTestKit
docs.
QUESTION
I'm a total AWS newbie trying to parse tables of multi page files into CSV files with AWS Textract.
I tried using AWS's example in this page however when we are dealing with a multi-page file the response = client.analyze_document(Document={'Bytes': bytes_test}, FeatureTypes=['TABLES'])
breaks since we need asynchronous processing in those cases, as you can see in the documentation here. The correct function to call would be client.start_document_analysis
and after running it retrieve the file using client.get_document_analysis(JobId)
.
So, I adapted their example using this logic instead of using client.analyze_document
function, the adapted piece of code looks like this:
ANSWER
Answered 2021-Apr-14 at 18:46Consider use two different lambdas. One for call textract and one for process the result.
Please read this document
And check this repository
https://github.com/aws-samples/aws-step-functions-rpa
To process the JSON you can use this sample as reference https://github.com/aws-samples/amazon-textract-response-parser or use it directly as library.
QUESTION
I am migrating to vue.js 3 and did not find a solution to get this working:
In Vue.js 2 I was able to load a component like this and assign a alias name:
...ANSWER
Answered 2021-Mar-28 at 10:48In your example, AsyncComponent
is the component name, isn't it? So:
QUESTION
I am writing an async lambda on AWS using Node.js (14.x). This lambda is being called by an API Gateway (REST API, POST method, CORS enabled).
To allow the API Gateway to call an async lambda, I added the following HTTP Header to its Integration Request: Name = X-Amz-Invocation-Type
and Mapped from (value) = 'Event'
as specified here.
When I run Test, I get the following output:
...ANSWER
Answered 2021-Mar-26 at 08:17This is working as intended. The second sentence in AWS docs on "Asynchronous invocation" says:
When you invoke a function asynchronously, you don't wait for a response from the function code.
If you want a response with a result, asynchronous invocation will not work.
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