I have a bean, say manager, which is used all over my application for remoting. The bean is using httpclient which in turn can be configured with or without proxy. But this configuration can be only one. What i want in my application is: when the application started, the user is asked does she want to use a proxy or not? And depending on the user's answer the bean is properly configured and only then started. Some sort of dynamic configuration during runtime.
Is it possible or maybe I should achieve this some other way?
Thank you.
Why can't you call setProxy() on httpclient configuration depending on user's input?
Alternatively you can configure httpclient as bean in Spring context (either directly or create a simple wrapper) two times - one with proxy and one without. Then manager can choose which one to use depending on user's input (both can be injected into manager).
Related
I am developing an API with quarkus 1.11. I would like to make a call to another API but only locally I don't want it to be called in production.
I know what I can do:
ProfileManager.getActiveProfile() != "test"
But I would like to know if it is possible to configure it with some java annotation or in the aplication.properties as:
%dev.test.api/mp-rest/url=DISABLED
Thank you so much!
With the configuration properties and the MP-restclient you cant deactivate and endpoint, only change the url to a different one.
But what you can do instead is create a configuration property similar to the one you suggested, then inject the property in your code and use it to call or not your endpoint, It is similar to the logic you do the profile manager, but you will have more control over the invocation.
For example this could be the properties.
%dev.test.api.enabled=true
%prod.test.api.enabled=false
Then inject the properties like in this example using the injection capabilities of quarkus and cdi.
Then implementing the condition to check if the call must be made or not.
I think that you will not find any property to do not make a call, because at the end you are executing a method and waiting for an answer, and this behaviour cannot be altered by an endpoint property, only by code offering an alternative response or execution path.
I have multiple configuration files in java spring.
I need to instantiate it based on the request parameters.
Is there any way to do it?
Thanks in advance!!
Sakthi
This is not possible, as Spring initializes the configuration before the service starts (or more accurate, when it starts) so when you get a request, it is too late - the configuration is already built.
You can, however, control it with spring profiles- either via env variable on the machine or arguments passed to the jvm when you run your app. This way you can control which spring profile to use and set the configurations per profile.
It is needed to define Spring scope which will provide a proxy to the beans and reload/recreate target beans when say an event occurs. The behavior is similar to session beans, except there is no http session.
Does Spring provide a way for such bean proxing and scope manipulation?
UPDATED
Say that it is need to change externalUrl which is used to send http requests. So the application has to switch to new bean with new http connection pool created.
When bean autowired directly it is imposible to recreate it, especially when it is used in many places. So I search some way to inject a proxy instead of it and recreate target instace without altering caller code.
It is possible. I can't tell you exactly how to do it, but if you're able to, something like Spring Cloud Config would be exactly what you want. If you can't adopt that, I would start digging into the source code. The class you'd want to start with is the RefreshScope - from there, you should be able to figure out how it works and how it re-creates beans. I'm sorry that I can't provide more direction.
Is it possible to inject a bean from a web application that deploy in another server!
I declare a scenario to myself, I have two web application that use spring framework and deploy separately in different application servers (one is TOMCAT and another one is WEBLOGIC),the first application has ServiceA and the second one has ServiceB, now I want to inject ServiceB in ServieA?
I try to do this with RMI once an another one with JMS, now I am wondering that:
Is it possible with another thing?
Is there any active project about this scenario exist?
How can share application context in spring framework, is it possible?
Thanks.
Bean is just an object in JVM. You certainly cannot use an object from one JVM in another JVM straightforward.
But you can do 2 things:
Use proxies - some objects that will have the same interface but invoke somehow to the proper server as implementation.
Use service-oriented architecture (SOA). Each server should have some limited set of beans that are responsible for their functionality. And all beans can interact with each other.
Maybe OSGI is suitable for this.
Web services, JAX-RS is the simplest. But JAX-WS provides you with the tools to automatically generate the client code.
I'm currently using Spring and Hibernate. At the moment, if I make a create object call (for example) from the client a request comes in on the service stub on the serverside. The service call has to create a new hibernate session factory, get the session, and then make the transaction. The problem is that this occurs every single time, so the session factory needs to be recreated to be used. This seems to be extremely wasteful and performance impacting since creating that factory takes a toll.
What I would like to do is reuse that one session factory, for example, across different service calls made by the client or multiple clients. The problem is I don't know how to do that since the entry point to the serverside functionality is the service call. I know that I would have to save state on the serverside somehow so that different calls could access the same session factory. I know of the scalability issues with keeping state and such, but there has to be a way to reuse previously created objects.
My question is how would I do this with Spring (am I supposed to use Session beans or HttpSession)? Is it possible for the container to set these things up on startup or does it have to wait for a service request to come in?
I'm for the most part a Spring newb, is it just that I don't understand the web service role?
Thanks in advance.
Yours is typical MVC scenario which is achieved by GWT+MVP. Based on your description seems you are creating the session-factory on every call which is obviously not a standard practice.
Session-factory is created only once and every request executes in a different session created by the session-factory.
With Spring, typical approach would be to configure the session-factory with spring wiring and hibernate. This config will be loaded only once when application starts up.
On every service request, get the reference of session-factory from the bean-container (instead of creating it every time) and create session from it for DB operation.
Check out this project which uses GWT+MVP+Spring+MyBatis. I understand that you use Hibernate instead of MyBatis but this would server as reference for this type of project.