blocking | A thread pool for isolating blocking I/O in async programs | Reactive Programming library
kandi X-RAY | blocking Summary
kandi X-RAY | blocking Summary
A thread pool for isolating blocking I/O in async programs. Sometimes there's no way to avoid blocking I/O. Consider files or stdin, which have weak async support on modern operating systems. While IOCP, AIO, and io_uring are possible solutions, they're not always available or ideal. Since blocking is not allowed inside futures, we must move blocking I/O onto a special thread pool provided by this crate. The pool dynamically spawns and stops threads depending on the current number of running I/O jobs. Note that there is a limit on the number of active threads. Once that limit is hit, a running job has to finish before others get a chance to run. When a thread is idle, it waits for the next job or shuts down after a certain timeout.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of blocking
blocking Key Features
blocking Examples and Code Snippets
Lines of Code : 11
License : No License
Copyimport { commandOptions } from 'redis';
const blPopPromise = client.blPop(
commandOptions({ isolated: true }),
'key',
0
);
await client.lPush('key', ['1', '2']);
await blPopPromise; // '2'
public void serverSideStreamingListOfStockPrices() {
logger.info("######START EXAMPLE######: ServerSideStreaming - list of Stock prices from a given stock");
Stock request = Stock.newBuilder()
.setTickerSymbol("AU")
@RabbitListener(queues = "blocking-queue", containerFactory = "retryContainerFactory")
public void consumeBlocking(String payload) throws Exception {
logger.info("Processing message from blocking-queue: {}", payload);
throw new E @Bean
public Queue nonBlockingQueue() {
return QueueBuilder.nonDurable("non-blocking-queue")
.build();
} Community Discussions
Trending Discussions on blocking
QUESTION
I build a notification system which shows a bootstrap alert div in a NotificationHandler blazor component. This works fine but the notifications stay there. I'd like to make these notifications disappear after x seconds. How can I do this while not blocking UI and making sure it is executed on the blazor render thread.
See example code below:
...ANSWER
Answered 2021-Jun-15 at 14:34await InvokeAsync(async () => // note the 'async'
{
_notifications.Add(notification);
StateHasChanged();
// TODO: remove notification the _notifications after x seconds
await Task.Delay(2_000); // x = 2
_notifications.Remove(notification);
StateHasChanged();
});
QUESTION
Someone can explain me why the behavior of Twitter future is not Async? Having this code
...ANSWER
Answered 2021-Jun-15 at 11:02Twitter futures have somewhat different semantics from "standard" futures in scala.
Future.apply is actually analogous to standard scala's Future.successful: it creates a Future that is already satisfied – so, the block you pass in is executed immediately.
With Twitter Futures, you don't need the annoying ExecutionContext that you have to drag implicitly everywhere. Instead, you have a FuturePool to which you hand code explicitly to be asynchronously executed. E.g.:
QUESTION
I'm developing an Avalonia App using ReactiveUI and MVVM. I want to display an image from a web URL, what would be the best course of action to achieve this ? I have setup the following Binding :
...ANSWER
Answered 2021-May-22 at 09:34You can download and store the Image in your ViewModel asynchronously, or using the download complete event for example like this:
QUESTION
I know this question has been asked many times, but I still can't figure out what to do (more below).
I'm trying to spawn a new thread using std::thread::spawn and then run an async loop inside of it.
The async function I want to run:
...ANSWER
Answered 2021-Jun-14 at 17:28#[tokio::main] converts your function into the following:
QUESTION
I am running a Java based application and it is crashing due to Insufficient memory. Some output snippet of hs_err :
...ANSWER
Answered 2021-Mar-04 at 01:48You've used -Xms to force the JVM to get ~30GB at JVM startup.
It has tried, and failed. It only obtained 8GB. It needs another 22-ish GB but cannot get it. That is what the error message is telling you. This is consistent with a dump that says the heap is only 8GB.
You're asking for more than the OS will provide. You'll need to figure out what's going on in the OS in general.
Your application code is probably not involved. The JVM is still initializing its heap in accordance with your command-line options.
QUESTION
We have setup Redis with sentinel high availability using 3 nodes. Suppose fist node is master, when we reboot first node, failover happens and second node becomes master, until this point every thing is OK. But when fist node comes back it cannot sync with master and we saw that in its config no "masterauth" is set.
Here is the error log and Generated by CONFIG REWRITE config:
ANSWER
Answered 2021-Jun-13 at 07:24For those who may run into same problem, problem was REDIS misconfiguration, after third deployment we carefully set parameters and no problem was found.
QUESTION
I'm new to Combine and I'm trying to understand it by solving the "old" problems
My goal is to make the process cancelable, but even I called the .cancel() method right after (or with sort delay) the printFizzbuzz() method, the code still keeping running(around 3 secs) until finishing
I've tried the code below in the new Xcode project, still the same
...ANSWER
Answered 2021-Jun-06 at 21:57The problem is that your publisher is too artificially crude: it is not asynchronous. An array publisher just publishes all its values at once, so you are canceling too late; and you are blocking the main thread. Use something like a timer publisher instead, or use a flatmap with a delay and backpressure.
QUESTION
I've got a datagramChannel client server application I'm building . The server is my desktop and the clients are android devices. I can send a message to the server, but it seems as though blocking guard is being activated (At least that's where the debugger takes me).
Anyway, the buffer is not getting the reply from the server. As far as I can tell the server is able to send and receive messages. But I'll post that code if asked.
Here is my client setup.
...ANSWER
Answered 2021-Jun-12 at 17:44Soo, basically everything in my server was wrong lol. The biggest thing I think is that I wasn't flipping the buffer in my server's read function. After adding it to my server code I was able to send data back to my client.
A special no thanks to user207421 for not only not being helpful but being fairly rude about it (for multiple questions).
QUESTION
The app has:
- ListView listing player names from a DB table (only one column, so it is primary key)
- EditText to write the new name
- Button to update the name of player in the list
*there are more things, but i don´t want to make it more messy
I can click a name from the list and write a new name in the EditText. When you press the button that name is updated in the list.
Everything works correctly, but there is a problem. When I write a name that it is already in the list the app fails because primary keys cannot be repeated.
Is there some way to say "if EditText text already exists in the DB... then show a toast"
I already tried "if result of db.update is -1...then show a toast", but it doesn´t work.
This is the method in MainActivity:
...ANSWER
Answered 2021-Jun-11 at 22:09Issues
You have a UNIQUE index on the NUM_JUG column (perhaps implicit if NON_JUG is defined with PRIMARY KEY) and you are using the standard update method which uses the default conflict action of ABORT and therefore fails if an attempt is made to duplicate a NOM_JUG value.
As secondary issue is that the SQLiteDatabase update method returns the number of updates (see extract and link below) (same for updateWithOnConflict). The number returned will never be -1 it will be 0 or more (0 indicating that no updates have been applied).
As per SQLite Database - Update
Returns
int the number of rows affected
Fix
To fix the main issue you should use the updateWithOnConflict method. This takes a 4th parameter a conflict and you probably want IGNORE so you could use :-
QUESTION
I have a form which performs an event on submit.
The form contains a textarea, that when you click on it, the submit button appears, and when you click out it disappears (using onFocus and onBlur for this to flag variable 'showSubmit'):
...ANSWER
Answered 2021-Jun-11 at 19:55I reproduced this and solved it this way:
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Rust is installed and managed by the rustup tool. Rust has a 6-week rapid release process and supports a great number of platforms, so there are many builds of Rust available at any time. Please refer rust-lang.org for more information.
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