Hi Raffaele
If you have a chance to build the Guice Injector yourself and
defining which Definitions should be used you can try to intercept
method calls. This could be a possibility.
Cheers Noc
Am 16.04.2012 13:32, schrieb Raffaele Castagno:
> Sorry for the half baked post.
>
> Disclaimer: I'm using a third-party framework, so I don't have
> control on the
> application startup, I can only do the guice init on-demand inside
> the services
> I create.
>
> Also, I'm new to DI in general and Guice in particular.
>
> I have to introduce a customization mechanism in the app I'm
> working on.
> Basically, I want to be able to do something like this:
>
> public class MyServerClass implements Invokable
> // Invokable is a third-party interface used to tell the server
> that this class contains services
> {
> public static Object myServiceMethod ()
> {
> if(#MyCustomerServiceClass.myServiceMethod# is available)
> {
> return MyCustomerServiceClass.myServiceMethod();
> }
> else
> {
> return MyCoreServiceClass.myServiceMethod();
> }
> }
> }
>
> class MyCoreServerClass
> {
> public static Object myServiceMethod ()
> {
> return "A";
> }
> }
>
> class MyCustomerServiceClass extends MyCoreServerClass
> {
> public static Object myServiceMethod ()
> {
> return "B";
> }
> }
>
> My requirement is that I should be able to introduce
> MyCustomerServiceClass without
> changing nor recompile MyServerClass MyCoreServerClass.
>
> That is, I have my app with
> MyBasicSetOfClasses.jar
> and everything works fine, than I introduce
> MyCustomerSpecificClasses.jar
> eventually touch some external configuration file, and I have the
> cusomized myServiceMethod()
> responding to calls to "com.mycompany.MyServerClass.myServiceMethod".
>
> Is it possible to inject dependencies this way, with the new
> "configuration" inside
> an additional JAR in the classpath or in an external configuration
> file?
>
> Thanks in advance, and sorry for the double post, and the
> convoluted and dumb request.
>
> Raffaele C.
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