I know generally you cannot execute a pointcut based on an annotation that was made on an interface, but is there anyway to do this with Spring Data Repository Proxies?
I have custom annotations for caching and make use of AOP to intercept certain methods and cache values, very similar to how Ehcache works.
Is there any way to use these annotations with a Spring Data Repository?
Related
I started playing around with Quarkus and its REST client. According to the documentation a Jax-RS annotated interface should be created and annotated further with #RegisterRestClient.
My issue is that I already have the JaxRS interfaces for the services I need to connect to, in an artifact provided by the server, which I can just import. Is there a way to use an already created external Jax-RS interface to create a service with? It seems so wrong to copy-paste the code for a perfectly good interface, when it has been so nicely served for me.
There's RestClientBuilder, which allows programmatic usage of JAX-RS interfaces. Assuming the JAX-RS interface is called HelloClient, you can do this:
HelloClient client = RestClientBuilder.newBuilder()
.baseUri(URI.create("http://localhost:8080"))
.build(HelloClient.class);
I am developing a rest web service using reactive programming through spring-webflux(Spring Boot 2.1 and Spring Framework 5.1). I need to create components having request level scope. #Scope annotation is suggested for spring MVC applications. But I found that the same doesn't work with webflux application.
Is there an equivalent feature available in webflux, as of latest release?
If not, what shall be the workaround here to create a new instance of a component on every incoming request?
I am trying to avoid use of new operator.
Thank you for the suggestions.
Unfortunately you cannot use request scopes in spring-webflux like in spring MVC applications. The main reason being, they use ThreadLocals which cannot be used by spring-webflux as work can be done on any thread at any time.
Spring webflux uses project-reactor at its core. So you can use Reactor Context which allows you to share data in your reactive pipeline.
Can I use the existing spring-boot-starter-web coding scheme with only spring-boot-starter-webflux added?? without spring-boot-starter-web.
spring-boot-starter-webflux provides the relevant dependencies for a Spring WebFlux application, from Jackson to the spring-webflux module for annotation and functional programming models.
spring-boot-starter-web does the same for Spring MVC.
Having both on the classpath means that you want a Spring MVC app and still use the new WebClient provided by Spring WebFlux in that application.
As mentioned in the Spring Boot reference documentation, you should add spring-boot-starter-webflux if you want to create a Spring WebFlux app and avoid adding spring-boot-starter-web.
I created a Spring boot 2.0.0.M7 project with the webflux starter because I want to use all the asynchronous and the non-blocking capabilities.
I added the server.servlet.context-path but it does not work if I don't add the web starter as well.
If I add both starters can I have issues with the non-blocking functionality?
I executed some stress tests with Gatling and I have received the same scores removing the web starter or adding it.
Any help with this?
If you add both spring-boot-starter-web and spring-boot-starter-webflux to your application, Spring Boot will configure it as a Spring MVC app.
This is intentional as many Spring MVC will get the webflux dependency to leverage the new WebClient in their MVC apps. Also, as of Spring Framework 5, Spring MVC knows how to handle a few cases with Flux at the controller level.
You can always force your choice like this:
SpringApplication app = new SpringApplication(MyApplication.class);
app.setWebApplicationType(WebApplicationType.REACTIVE);
app.run(...);
In your case, this is not about forcing a choice but rather using something that's not supported in WebFlux.
The server.servlet.context-path configuration property is Servlet-specific, so it won't work with WebFlux. Currently Spring Boot does not support war deployment nor multiple web contexts for WebFlux applications. So there's no point in offering such a property.
The runtime model difference between "Servlet-based" and Reactive runtime with Spring can be quite subtle, and I encourage you to watch a talk that describes those choices. The short answer is: if you're using Spring MVC with async types (DeferredResult, Flux or SseEmitter) things will be async but reading and writing will still be blocking.
Properly benchmarking that is quite hard, but the results you're seeing are somehow expected. Running locally server+client, no latency involved, looking at raw throughput - all of those constraints should not be in favour of the reactive model which has a concurrency cost. If anything, this benchmark shows that the reactive stack is quite optimized already, even for non-ideal use cases!
I'm trying to find examples on the web of how to use AOP via Ninject. Can someone confirm if AOP is available in Ninject 2 without using external libraries (i.e. Castle Windsor?).
If it can be done, could you post a link to resources that would help me get started?
Yes, use the Interception extension:
https://github.com/ninject/ninject.extensions.interception
http://www.google.ch/search?client=firefox-a&rls=org.mozilla%3Aen-GB%3Aofficial&channel=s&hl=de&source=hp&biw=1330&bih=813&q=Ninject.Extensions.Interception&btnG=Google-Suche