Guice to inject separate customer implementations?

[JPE]

Hi,

I just started looking at Guice to see if it can meet some requirements for a library I maintain. Assume a jar that describes some interfaces, core.jar. The implementations of the interfaces will be contained in a separate jar. There will be several jars that include the implementations, one for each customer (implA.jar, implB.jar ...). The users of the library will include one and only one of the implementation jars in their applications. The implementation jars contain proprietary data so only one implementation jar will be delivered with the application.

My question is how to perform binding when the api jar will know nothing about the implementations. I've looked at the docs about Providers and Modules, but I'm not seeing how binding occurs from the implementation side.

I've considered using a property or environment variable to indicate the customer and then using that to map to an implementation class name, and then using the name to get the class, but that seems like it's defeating the purpose of Guice/DI.

Any thoughts are welcome. Thanks.

[Laszlo Ferenczi]

Hi,

Probably the most obvious one is to define the module in the impl jars (with the same package and same classname) where the implementation is known. Users of the lib only have to include a well known class.

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L

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