How to introduce app customization with Guice?

[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.

[Noctarius]

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

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