mono | Mono open source ECMA CLI, C# and NET implementation | DevOps library
kandi X-RAY | mono Summary
kandi X-RAY | mono Summary
Mono open source ECMA CLI, C# and .NET implementation.
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QUESTION
I'm trying to initiate a Springboot project using Open Jdk 15, Springboot 2.6.0, Springfox 3. We are working on a project that replaced Netty as the webserver and used Jetty instead because we do not need a non-blocking environment.
In the code we depend primarily on Reactor API (Flux, Mono), so we can not remove org.springframework.boot:spring-boot-starter-webflux dependencies.
I replicated the problem that we have in a new project.: https://github.com/jvacaq/spring-fox.
I figured out that these lines in our build.gradle file are the origin of the problem.
...ANSWER
Answered 2022-Feb-08 at 12:36This problem's caused by a bug in Springfox. It's making an assumption about how Spring MVC is set up that doesn't always hold true. Specifically, it's assuming that MVC's path matching will use the Ant-based path matcher and not the PathPattern-based matcher. PathPattern-based matching has been an option for some time now and is the default as of Spring Boot 2.6.
As described in Spring Boot 2.6's release notes, you can restore the configuration that Springfox assumes will be used by setting spring.mvc.pathmatch.matching-strategy to ant-path-matcher in your application.properties file. Note that this will only work if you are not using Spring Boot's Actuator. The Actuator always uses PathPattern-based parsing, irrespective of the configured matching-strategy. A change to Springfox will be required if you want to use it with the Actuator in Spring Boot 2.6 and later.
QUESTION
I have written a logic using spring reactor library to get all operators and then all devices for each operator (paginated) in async mode.
Created a flux to get all operator and then subscribing to it.
...ANSWER
Answered 2022-Mar-16 at 11:34I broke it down to two flows 1st getting all operators and then getting all devices for each operator.
For pagination I'm using Flux.expand to extract all pages.
QUESTION
I recently found, that I can make Linux system calls from .NET relatively easy.
For example, to see if I need sudo I just make a signature like this:
ANSWER
Answered 2021-Nov-01 at 11:54So, I was wrong posting the last answer. I found out, the libc binary contained something like __xstat and I called it.
Wrong! As the name would suggest, it was a kind of a private function, something intended to be an implementation detail, not a part of the API.
So I found another function with a normal name: statx. It does exactly what I need, it is well(-ish) documented here:
https://man7.org/linux/man-pages/man2/statx.2.html
Here's the structure and values: https://code.woboq.org/qt5/include/bits/statx.h.html https://code.woboq.org/userspace/glibc/io/fcntl.h.html
TL;DR - it works.
I figured out that -100 (AT_FDCWD) passed as dirfd parameter makes relative paths relative to the current working directory.
I also figured out that passing zeros as flags works (as equivalent to AT_STATX_SYNC_AS_STAT), and the function returns what it should for a regular local filesystem.
So here's the code:
QUESTION
How to manage access to shared resources using Project Reactor?
Given an imaginary critical component that can execute only operation at the time (file store, expensive remote service, etc), how could one orchestrate in reactive manner access to this component if there are multiple points of access to this component (multiple API methods, subscribers...)? If the resource is free to execute the operation it should execute it right away, if some other operation is already in progress, add my operation to the queue and complete my Mono once my operation is completed.
My idea is to add tasks to the flux queue which executes tasks one by one and return a Mono which will be complete once the task in the queue is completed, without blocking.
...ANSWER
Answered 2022-Feb-23 at 10:26this looks like a simplified version of what the reactor-pool does, in essence. have you considered using that with eg. a maximum size of 1?
https://github.com/reactor/reactor-pool/
https://projectreactor.io/docs/pool/0.2.7/api/reactor/pool/Pool.html
The pool is probably overkill, because it has the overhead of having to deal with multiple resources on top of multiple competing borrowers like in your case, but maybe it could provide some inspiration for you to go further.
QUESTION
I am trying to implement my custom GlobalExceptionHandler class by extending AbstractErrorWebExceptionHandler (default implementation is DefaultErrorWebExceptionHandler class) but unable to do so as bean(stated below) is missing which is required in constructer initilization .I am not sure why this is happening as by default implemetation it is working fine and by giving my own implementation it is asking for a bean, Please help
...ANSWER
Answered 2021-Dec-13 at 02:43@Slf4j
@Component
@Order(-99)
public class ExceptionHandler implements WebExceptionHandler {
@Override
public Mono handle(ServerWebExchange serverWebExchange, Throwable throwable) {
ServerHttpResponse response = serverWebExchange.getResponse();
response.setStatusCode(HttpStatus.BAD_REQUEST);
response.getHeaders().setContentType(MediaType.APPLICATION_JSON);
JSONObject resMsg = new JSONObject();
try {
resMsg.put("code", HttpStatus.BAD_REQUEST.value());
if(throwable instanceof CommonException){
resMsg.put("msg", ((CommonException) throwable).getMsg());
}else{
log.error("system error:", throwable);
resMsg.put("msg", CommonCode.PLATFORM_ERR_MSG);
}
} catch (Exception e) {
}
DataBuffer db = response.bufferFactory().wrap(resMsg.toString().getBytes(Charset.forName("UTF-8")));
return response.writeWith(Mono.just(db));
}
}
QUESTION
I am running a Spring Boot app that uses WebClient for both non-blocking and blocking HTTP requests. After the app has run for some time, all outgoing HTTP requests seem to get stuck.
WebClient is used to send requests to multiple hosts, but as an example, here is how it is initialized and used to send requests to Telegram:
WebClientConfig:
...ANSWER
Answered 2021-Dec-20 at 14:25I would propose to take a look in the RateLimiter direction. Maybe it does not work as expected, depending on the number of requests your application does over time. From the Javadoc for Ratelimiter: "It is important to note that the number of permits requested never affects the throttling of the request itself ... but it affects the throttling of the next request. I.e., if an expensive task arrives at an idle RateLimiter, it will be granted immediately, but it is the next request that will experience extra throttling, thus paying for the cost of the expensive task." Also helpful might be this discussion: github or github
I could imaginge there is some throttling adding up or other effect in the RateLimiter, i would try to play around with it and make sure this thing really works the way you want. Alternatively, consider using Spring @Scheduled to read from your queue. You might want to spice it up using embedded JMS for further goodies (message persistence etc).
QUESTION
I want to handle Flux to limit concurrent HTTP requests made by List of Mono.
When some requests are done (received responses), then service requests another until the total count of waiting requests is 15.
A single request returns a list and triggers another request depending on the result.
At this point, I want to send requests with limited concurrency. Because consumer side, too many HTTP requests make an opposite server in trouble.
I used flatMapMany like below.
ANSWER
Answered 2021-Aug-20 at 04:29I am afraid Project Reactor doesn't provide any implementation of either rate or time limit.
However, you can find a bunch of 3rd party libraries that provide such functionality and are compatible with Project Reactor. As far as I know, resilience4-reactor supports that and is also compatible with Spring and Spring Boot frameworks.
The
RateLimiterOperatorchecks if a downstream subscriber/observer can acquire a permission to subscribe to an upstream Publisher. If the rate limit would be exceeded, theRateLimiterOperatorcould either delay requesting data from the upstream or it can emit aRequestNotPermittederror to the downstream subscriber.
QUESTION
I want to be able to call C# code from JavaScript. The mono project used to have a WASM SDK that you could download from their old Jenkins server, but that is no longer public. Existing docs tend to point toward those builds. The Azure Devops builds do not include this SDK. A few messages I've seen on their Github account indicate that they are now focusing on the .NET 6 for WASM. I do not wish to use the Blazor components. Is there a way in .NET 6 to build a minimally sized WASM binary without the Blazor UI?
...ANSWER
Answered 2021-Aug-26 at 01:25Yes it's absolutely possible. Blazor does not have a monopoly on C#/WASM and it's far from clear that it's going to wind up being the best long term option (and a lot of evidence it's not).
I recommend starting with the Uno WASM Bootstrap. https://github.com/unoplatform/Uno.Wasm.Bootstrap
QUESTION
I am stuck while calling the graphQL mutation API in spring boot. Let me explain my scenario, I have two microservice one is the AuditConsumeService which consume the message from the activeMQ, and the other is GraphQL layer which simply takes the data from the consume service and put it inside the database. Everything well when i try to push data using graphql playground or postman. How do I push data from AuditConsumeService. In the AuditConsumeService I am trying to send mutation API as a string. the method which is responsible to send that to graphQL layer is
...ANSWER
Answered 2022-Jan-23 at 21:40You have to send the query and body as variables in post request like shown here
QUESTION
During unit testing retry the response of the mock seems cached, or most probably I am doing something wrong.
I am trying to request something, if error happened then retry twice with delay of 1 second.
...ANSWER
Answered 2022-Jan-19 at 15:18someInjectedService.doSomething(...) will indeed technically be called only once.
You could use Mono.defer(() -> someInjectedService.doSomething(someParam)) instead, to ensure the method is effectively called again, which should make your test pass.
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Install mono
You can run the mono and mcs test suites with the command: make check. Expect to find a few test suite failures. As a sanity check, you can compare the failures you got with [https://jenkins.mono-project.com/](https://jenkins.mono-project.com/). You can now install mono with: make install. You can verify your installation by using the mono-test-install script, it can diagnose some common problems with Mono’s install. Failure to follow these steps may result in a broken installation.
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