spring-reactive | Reactive Programming library
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kandi X-RAY | spring-reactive Summary
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QUESTION
Just starting to understand reactive programming with Reactor and I've come across this code snippet from a tutorial here building-a-chat-application-with-angular-and-spring-reactive-websocket
...ANSWER
Answered 2021-May-20 at 13:21The difference is much more conventional rather than functional - the difference being side-effects vs a final consumer.
The doOnXXX series of methods are meant for user-designed side-effects as the reactive chain executes - logging being the most normal of these, but you may also have metrics, analytics, etc. that require a view into each element as it passes through. The key with all of these is that it doesn't make much sense to have any of these as a final consumer (such as the println() in your above example.)
On the contrary, the subscribe() consumers are meant to be a "final consumer", and usually called by your framework (such as Webflux) rather than by user code - so this case is a bit of an exception to that rule. In this case they're actively passing the messages in this reactive chain to another sink for further processing - so it doesn't make much sense to have this as a "side-effect" style method, as you wouldn't want the Flux to continue beyond this point.
(Addendum: As said above, the normal approach with reactor / Webflux is to let Webflux handle the subscription, which isn't what's happening here. I haven't looked in detail to see if there's a more sensible way to achieve this without a user subscription, but in my experience there usually is, and calling subscribe manually is usually a bit of a code smell as a result. You should certainly avoid it in your own code wherever you can.)
QUESTION
I'm following this example https://github.com/hantsy/spring-reactive-sample/blob/master/boot-exception-handler/src/main/java/com/example/demo/DemoApplication.java ...which works -- sets the createDate MongoDB field on creation. The version there is 2.1.6.RELEASE. However, when I upgrade this to 2.4.2, createDate is no longer set. There are no warnings, it seems just to have stopped working.
The model class is:
...ANSWER
Answered 2021-Jan-25 at 16:34Resolved by using the new @EnableReactiveMongoAuditing annotation, plus a bean like
QUESTION
I have 2 Spring-Boot-Reactive apps, one server and one client; the client calls the server like so:
...ANSWER
Answered 2021-Jan-25 at 06:50I've got it running by changing 2 points:
- First: I've changed the
contenttype of the response of your/thingsendpoint, to:
QUESTION
I'm working on a micro service powered by SpringMVC and Spring Cloud Kafka.
For simplicity I will only focus on the part that makes HTTP request.
I have a binding function like the following (please note that I'm using the functional style binding).
...ANSWER
Answered 2020-Dec-23 at 15:07The default max.poll.interval is 5 minutes; you can increase it or reduce max.poll.records. You can also set a timeout on the rest call.
QUESTION
I am trying to write a reactive Spring Cloud Function service using RabbitMQ which will consume off one queue and produce to an exchange.
I have 2 questions.
- Why am I getting the error below in the logs.
- How would I do a reject with a doOnError? The doOnError has access to only the throwable, and not the message to do a reject.
Here is the application code. It is copied from this question Spring Reactive Stream - Unexpected Shutdown
...ANSWER
Answered 2020-Sep-15 at 19:23Figured out how to have a Function send messages to a DLQ when failed. I added a Consumer also since they are related.
I believe we need to ack or reject the message, but when rejecting we want to return a Flux.empty() so nothing gets published to the downstream exchange.
Code rejects any message with fail as payload, and acks any other message.
QUESTION
CircleCI introduces orb in 2.1, I am trying to add Circle Ci config my sample project.
But in my testing codes, I have used test containers to simplify the dependent config of my integration tests.
When committing my codes, the Circle CI running is failed.
...ANSWER
Answered 2020-Jul-14 at 02:30Got it run myself.
The maven orb provides reusable jobs and commands, but by default, it used a JDK executor, does not provide a Docker runtime.
My solution is giving up the reusable job, and reuse some commands from the maven orb in your own jobs.
QUESTION
I tried to upgrade my tests to use TestConainers and Spring @DynamicPropertySource.
ANSWER
Answered 2020-Apr-22 at 06:07You are defining junit.jupiter.testinstance.lifecycle.default=per_class in your junit-platform.properties. Setting this back to per_method or just delete the line would fix your problem.
Testcontainers JUnit extension does not really play well with this setting if you do not start to take control over the container lifecycle by yourself.
But mixing with with the strict restriction of having a static method for the @DynamicPropertySource would require to start the container upfront the properties registration. This looks, at least to me, not ideal for a clean test structure.
QUESTION
I was trying to taste R2dbc and using Embedded H2 like:
...ANSWER
Answered 2020-Jan-05 at 04:39From the official documentation
QUESTION
I have a Spring reactive sample application that was modified from one of the examples that was provided in the the Spring Webflux documentation. The master branch of this application uses Spring Boot in the traditional manner, with an embedded application server (Netty). It is working fine.
In the Liberty branch, I am trying to build the application as a WAR and deploy to Websphere Liberty Profile. Aside from changes to the build process, the most significant code change is having my Application.java (source here) extend AbstractAnnotationConfigDispatcherHandlerInitializer, as per Webflux documentation:
For Servlet containers especially with WAR deployment you can use the AbstractAnnotationConfigDispatcherHandlerInitializer which as a WebApplicationInitializer and is auto-detected by Servlet containers. It takes care of registering the ServletHttpHandlerAdapter as shown above. You will need to implement one abstract method in order to point to your Spring configuration.
However, when I do this, none of my resources/endpoints get mapped and none of my beans that I declare in Application.java are registered. This is the full output that I get, with the exception being thrown when trying to access the context root:
ANSWER
Answered 2018-Jan-05 at 01:43Spring 5 brings some variants of WebApplicationInitializer for webflux based applications.
Before Spring 5.0.2(Spring Boot 2.0.0.M7 aligned with this version), there is a bug in AbstractAnnotationConfigDispatcherHandlerInitializer, and in 5.0.2, this class is marked as @Deprecated, there is a new AbstractReactiveWebInitializer introduced. But this class seems also buggy, I have to override the createApplicationContext() to make it work.
See the comments in my sample AppInitializer for more details.
Check my workable war sample which was tested successfully on tomcat.
QUESTION
I belive there is no answear in the whole internet for this as it is probably very complex but I will go ahead and ask.
Basically, I want to have a cross communication between multiple Spring applications. Each of them is serving resources in a static way, here is the link for that topic. This serving is capitalized by other application instances that can download those files on request (for now I am transferring files via HTTP). I was able to download files thanks to the Downlolad and save file from ClientRequest using ExchangeFunction in Project Reactor SO question.
Right now I want to elevate my code so that in case of the connection issue or application being temporarily unavailable for the given timeout I am able to resume the downloading of the file. I configured the WebClient timeouts as in this article.
Right now, I thought that such code would actually let me handle temporarily unavailable services:
...ANSWER
Answered 2019-Nov-01 at 05:05Hi following is the implementation I found Spring-webflux-file-upload-download
and based on it following is my code for file download:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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Install spring-reactive
You can use spring-reactive 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 spring-reactive 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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