vert.x | Vert.x is a tool-kit for building reactive applications | Reactive Programming library
kandi X-RAY | vert.x Summary
kandi X-RAY | vert.x Summary
This is the repository for Vert.x core. Vert.x core contains fairly low-level functionality, including support for HTTP, TCP, file system access, and various other features. You can use this directly in your own applications, and it's used by many of the other components of Vert.x. For more information on Vert.x and where Vert.x core fits into the big picture please see the website.
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Top functions reviewed by kandi - BETA
- Returns the string value for the specified key .
- Renders the given options and arguments .
- Send file .
- Configure the pipeline .
- Checks if there are any files in the directory and if so return true .
- Handle proxy connect .
- Handles a short and long option .
- Returns the HttpMethod object corresponding to the given string value .
- Handle parsing .
- Dispatch command line arguments .
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vert.x Examples and Code Snippets
Community Discussions
Trending Discussions on vert.x
QUESTION
I have a vert.x program. I am creating a message consumer and attach it to listen on an address on the vertx event bus . later in the program I am unregistering that consumer . How do I know if the consumer is unregistered successfully ?
following code snippet shows how i register a consumer on an address on vertex event bus
...ANSWER
Answered 2022-Mar-29 at 14:13As for the first question, you can safely assume consumer is unregistered successfully when res.succeeded() returns true inside unregister handler (as per your example).
For the second part, afaik the event bus does not maintain the list of consumers registered to it, you have to maintain it yourself. The goal would be to have a map or some other collection where you store references for consumers when you register them with .consumer(...) method and remove them after unregister handler returns succeeded.
I think this would be the issue you are referring to (with the advice by the lead architect of vertx): https://groups.google.com/g/vertx/c/d70YlHLL7KU?pli=1
QUESTION
I need a small help with Rxjava . currently I have two hash maps . Each hash map contains vertex message consumers against a subscription key. I want to return a completable object only if I am able to unregister both vertex message consumers. How can I achieve it .
I can post the code i am working on.
@Override public Completable deregisterKeyEvents(String subscriptionId) {
...ANSWER
Answered 2022-Mar-28 at 13:18If you're willing to add Vert.x RxJava2 to your dependencies, you could do this with toCompletable:
QUESTION
I created Reactive SQL client on Quarkus using this official guide, but while making GET request on http://localhost:8080/hello trying to query data from database, I get such an error:
...ANSWER
Answered 2022-Mar-07 at 09:38You need to add something like:
QUESTION
The stack used in the API is: Spring-boot, Spring Webflux, Hibernate Reactive 1.1.3 and Postgresql.
I'd like to extract a string value from a Mono called desiredField and add it to a hashmap. I'm showing the DB, model, repository and the util module where all this is happening.
The JWTUtil is used to generate a JWT token for login purposes in the API. The JWTController is working fine, coming the token in response! The only thing is that a cannot extract de string value from a Mono.
I've tried two approaches. The reactive way, using the subscribe method. And the blocking way using the block method. These two approches are shown below with their own console prints.
In the first approach (the reactive way) I couldn't extract the desiredField from the Mono. The token comes in the response but without the desiredField in the token claims. The desiredField live only inside de stream (see console log prints), outside is null.
In the second approach (blocking way) there are an infinite loop error without getting the token in the response.
Could you help me to extract this value from the Mono?
Thanks in advance!
Postgres:
...ANSWER
Answered 2022-Mar-04 at 15:34The main point here i think is the way you are organizing the code, it seems to me that you are using a reactive framework, but thinking and coding in an imperative way.
If you change the generateToken and doGenerateToken to return a Mono, you can do something like the following:
QUESTION
I'm trying to use the content of an HttpClientResponse.toFlowable() outside of the event loop, using an AtomicReference to hold the Flowable.
So, I've set up a test which returns the body, then fails during the trailer decoding. Thus, my subscription to the flowable should receive the response body, then an error.
That's what I observe when I subscribe to the Flowable right after (still in the callback), but not when subscribing to the flow outside of the callback. In the latter case my test pass 1/3 of the time...
The vertx-rx doc clearly says that it's a hot flowable and should be either subscribed in the event loop OR paused.
So, I've tried to pause the response before subscribing but I get the same test results : only 1/3 of my runs got both the body and the exception.
Moreover, when looking at the Vert.x HttpClientResponse::toFlowable() implementation, I can see that a readStream.pause() is made anyway.
So my question is ... Am I missing something ? Or could it be a Vert.x bug ?
Here is the code I'm using :
...ANSWER
Answered 2022-Mar-03 at 16:24Ok, after more searches I've found out what happened.
SimplificationFirst, I've re-created a test removing the use of rx-vert, and added an exception handler on the socket :
QUESTION
In a DB heavy monolith based on wildfly. does it make sense to transform the DB access to reactive one for starters? should I see performance benefits?
also, the DB is sybase and the only 'generic' jdbc driver I know is from vert.x but this implies that I will have to put vert.x inside my wildfly. I understand that they are sort of alternatives but I cant find any other options.
I would love to hear your thoughts about the 2 points I am raising. In general, I cant commit to a full transition from wildfly to quarkus/vert.x from the get go as it will take lots of resources so I thought I could start smaller...
...ANSWER
Answered 2022-Feb-24 at 11:58Vert.x is a toolkit, which means, for example, you do not need to use the web server it provides, nor any other module. It's also very lightweight, so you will only add a few more dependencies to your application. So, yes it can make sense to integrate Vert.x.
vertx-jdbc-client however, cannot magically transform blocking calls into non-blocking calls. Instead, it will off-load the blocking calls onto Vert.x' worker thread pool. That will lead to another effect: The DB call you used to wait for, will immediately return, leaving you with nothing but a Future. That Future will eventually have the expected result.
Going further upstream in your code (the direction where your user's request came from), this means that you will have to
- either defer processing of the result via
Future.map()orFuture.compose() - block the thread to get the result immediately
You will win nothing by (2), so rule that out.
When you go for (1), you must defer all further processing, up to the point where the incoming request is originally handled. If that is, for example, a Servlet, you have to use Asynchronous Processing to make sure that Wildfly does not commit the response after the doGet, doPost etc. method exits.
The result of all this will be that Wildfly now handles your request asynchronously, with Vert.x managing the DB interaction. You can do that. But it would be more idiomatic to your current setup to just use Asynchronous Processing (or Spring's @Async feature) and wrap all of your code in a Runnable. Both approaches will not speed up request processing itself, because the processing depends on the slower DB. However, Wildfly will be able to process more requests because the threads it assigns to requests will not be blocked anymore.
Having all that said, if you want to migrate to Quarkus in small steps, you should do that service by service. Identify the Servlets (or Controllers) which do the work, and port them one by one to Quarkus. If sessions are your problem, then you could possibly share them between Wildfly and Quarkus, using Infinispan.
QUESTION
I need to record failure reason in metrics for each failed http call when using Vert.x WebClient. This compiles:
...ANSWER
Answered 2022-Feb-23 at 22:09You could try using many sequential onFailures. As long as the first doesn't handle the exception (recoverWithItem, recoverWithNull, recoverWithUni) or throw its own the next should observe the same failure.
QUESTION
I am checking this guide on using Quarkus to consume from SQS.
The thing is I want to do it on an endless loop, fetching new messages every 10 seconds for example, and inserting some data from the message in a database using Hibernate Reactive.
I created a Quarkus Scheduler, but since it does not support returning a Uni, I had to block the response from Hibernate reactive, and got this error
...ANSWER
Answered 2022-Feb-16 at 16:53Code would help to understand what you are doing. Based on information you have in your question I would suggest you you create the Uni with code like this:
QUESTION
I'm using Axon for implementation of CQRS/Event sourcing in my Vert.X microservice. In the bootstrap of my Verticle I have a createInfra methid for creation of my Axon context. When I try to get a ressource from ny projection I have no result and the request executed without end. When I check the QueryGateway, in the SimpleGatewayBus I have no subscription.
If someone can help me for fix my Axon configuration ? And I have a trouble with MongoDB Eventstore configuration.
Verticle
...ANSWER
Answered 2022-Feb-18 at 08:06I see 2 problems in the configuration:
You just "build" the configuration, but don't start it. After
buildConfiguration(), make sure to call 'start()' on the returned Configuration instance. Alternatively, directly callstart()on the Configurer. It returns a started configuration instance.That should resolve the registrations not coming through. But it will probably trigger an exception related to the next issue....
Your MongoTokenStore configuration is incomplete. The TokenStore needs at least a serializer and a
MongoTemplateinstance. The latter tells the Axon which collections you want to certain types of information in. In your case, only theTrackingTokenCollectionwould be relant.
QUESTION
I have a CQRS/Eventsourcing architecture with 3 microservices. I implemented 2 microservices with vert.x 4 and I implemented CQRS/Eventsourcing without framework to improve my knowledge of this type of architecture. For the third microservice I would like to use AxonIq Framework but I have a problem with Aggregate annotation because it's not avalaible with vert.x but only with Spring. I implemented a Spring microservice using Axon and everything work fine but I would like to know if someone can help me for use vert.x with AxonIq ? If anyone know a workaround for this problem ?
Thank
...ANSWER
Answered 2022-Feb-15 at 11:05Axon Farmework provide something called Configuration API. You can have a look at the Configuration class but for making use of it, you need a Configurer, which will provide you all means of configuring your components!
On the ref-guide, you also have several examples of how to do the configuration using the API or Srring Boot. Example for Commands can be found here.
To help a bit more, I can also share a small project I made using Dropwizard and Axon Framework, meaning no Spring was used and all the Configuration was done through the API. You can find it here https://github.com/lfgcampos/axon-playground/tree/master/chat-getting-started-dropwizard
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Install vert.x
You can use vert.x like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the vert.x component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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